http://wiki.polycount.com/w/index.php?title=3Dc&feed=atom&action=history
3Dc - Revision history
2024-03-28T10:28:44Z
Revision history for this page on the wiki
MediaWiki 1.23.2
http://wiki.polycount.com/w/index.php?title=3Dc&diff=6839&oldid=prev
EricChadwick at 14:10, 12 August 2015
2015-08-12T14:10:06Z
<p></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 14:10, 12 August 2015</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline"> </del>''Maps of normals produce beautiful images but they almost double the texture volume. Maps of normals which do not cause artifacts must be stored in textures of 8 bits per channels at least (RGB8), or better of 16 bits (!G16R16), like in all ATI's demos. In order to make the texture volume smaller the company carried out some experiments with DXTn formats (lossy compression called S3TC in OpenGL) and found out that the DXT5 was the most optimal: in this format each of two coordinates (x, y) is stored in its channel: color and alpha. In this format the memory size required is 4 times lower (32 bits against 8 bits)! As the further extension, ATI will support a new format in its new chips. It's based on the DXTC and previously named ATI2N. It differs from DXT5 in compression of only a color component (out of three) using the method identical for the alpha channel compression. The new format will tremendously increase the precision of compressed texture storage compared to the DXT5, with the size being the same.''</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>''Maps of normals produce beautiful images but they almost double the texture volume. Maps of normals which do not cause artifacts must be stored in textures of 8 bits per channels at least (RGB8), or better of 16 bits (!G16R16), like in all ATI's demos. In order to make the texture volume smaller the company carried out some experiments with DXTn formats (lossy compression called S3TC in OpenGL) and found out that the DXT5 was the most optimal: in this format each of two coordinates (x, y) is stored in its channel: color and alpha. In this format the memory size required is 4 times lower (32 bits against 8 bits)! As the further extension, ATI will support a new format in its new chips. It's based on the DXTC and previously named ATI2N. It differs from DXT5 in compression of only a color component (out of three) using the method identical for the alpha channel compression. The new format will tremendously increase the precision of compressed texture storage compared to the DXT5, with the size being the same.''</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:TextureFormatRuntime]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:TextureFormatRuntime]]</div></td></tr>
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EricChadwick
http://wiki.polycount.com/w/index.php?title=3Dc&diff=6838&oldid=prev
EricChadwick: removed old wiki syntax
2015-08-12T14:09:47Z
<p>removed old wiki syntax</p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 14:09, 12 August 2015</td>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">__NOTOC__</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">= 3Dc =</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It is a two-component compression format where only X and Y are stored, so it only supports [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]. Each channel uses the same compression technique as [[DXT#DXT5|DXT5]] alpha. 3Dc is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''.  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It is a two-component compression format where only X and Y are stored, so it only supports [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]. Each channel uses the same compression technique as [[DXT#DXT5|DXT5]] alpha. 3Dc is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - a texture compression library that handles 3Dc.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - a texture compression library that handles 3Dc.</div></td></tr>
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EricChadwick
http://wiki.polycount.com/w/index.php?title=3Dc&diff=123&oldid=prev
Cheeseplus: 7 revisions
2014-07-29T08:36:29Z
<p>7 revisions</p>
<table class='diff diff-contentalign-left'>
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<td colspan='1' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='1' style="background-color: white; color:black; text-align: center;">Revision as of 08:36, 29 July 2014</td>
</tr><tr><td colspan='2' style='text-align: center;'><div class="mw-diff-empty">(No difference)</div>
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Cheeseplus
http://wiki.polycount.com/w/index.php?title=3Dc&diff=122&oldid=prev
EricChadwick: Real-Time Normal Map DXT Compression link fixed
2011-04-06T13:06:56Z
<p>Real-Time Normal Map DXT Compression link fixed</p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 13:06, 6 April 2011</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 2:</td>
<td colspan="2" class="diff-lineno">Line 2:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It is a two-component compression format where only X and Y are stored, so it only supports [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]. Each channel uses the same compression technique as [[DXT#DXT5|DXT5]] alpha. 3Dc is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''.  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It is a two-component compression format where only X and Y are stored, so it only supports [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]. Each channel uses the same compression technique as [[DXT#DXT5|DXT5]] alpha. 3Dc is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''.  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - <ins class="diffchange diffchange-inline">a </ins>texture compression library that handles 3Dc.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.nvidia.com/<del class="diffchange diffchange-inline">object/texture_tools.html </del>NVIDIA Texture Tools] - texture compression library that handles 3Dc.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.nvidia.com/<ins class="diffchange diffchange-inline">gpu-accelerated-texture-compression </ins>NVIDIA Texture Tools] - <ins class="diffchange diffchange-inline">a </ins>texture compression library that handles 3Dc.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://msdn.microsoft.com/en-us/library/bb694531%28VS.85%29.aspx#BC5 Block Compression: BC5] - documentation from the Microsoft Developer Network (MSDN).</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://msdn.microsoft.com/en-us/library/bb694531%28VS.85%29.aspx#BC5 Block Compression: BC5] - documentation from the Microsoft Developer Network (MSDN).</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.nvidia.com/<del class="diffchange diffchange-inline">object</del>/real-time-normal-map-dxt-compression.<del class="diffchange diffchange-inline">html </del>Real-Time Normal Map DXT Compression] - whitepaper from id software & Nvidia; section 3.3 describes 3Dc.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer<ins class="diffchange diffchange-inline">.download</ins>.nvidia.com/<ins class="diffchange diffchange-inline">whitepapers/2008</ins>/real-time-normal-map-dxt-compression.<ins class="diffchange diffchange-inline">pdf </ins>Real-Time Normal Map DXT Compression] <ins class="diffchange diffchange-inline">(PDF) </ins>- <ins class="diffchange diffchange-inline">a </ins>whitepaper from id software & Nvidia; section 3.3 describes 3Dc.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td></tr>
</table>
EricChadwick
http://wiki.polycount.com/w/index.php?title=3Dc&diff=121&oldid=prev
EricChadwick: revised, plus more links
2010-09-21T17:07:27Z
<p>revised, plus more links</p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 17:07, 21 September 2010</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It is a two-component compression format <del class="diffchange diffchange-inline">using the same technique as [[DXT#DXT5|DXT5]] alpha</del>, <del class="diffchange diffchange-inline">designed for compressing </del>[[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]. <del class="diffchange diffchange-inline">It </del>is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''.  </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It is a two-component compression format <ins class="diffchange diffchange-inline">where only X and Y are stored</ins>, <ins class="diffchange diffchange-inline">so it only supports </ins>[[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]. <ins class="diffchange diffchange-inline">Each channel uses the same compression technique as [[DXT#DXT5|DXT5]] alpha. 3Dc </ins>is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [http://developer.nvidia.com/object/texture_tools.html NVIDIA Texture Tools] - texture compression library that handles 3Dc.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://msdn.microsoft.com/en-us/library/bb694531%28VS.85%29.aspx#BC5 Block Compression: BC5] - documentation from the Microsoft Developer Network (MSDN).</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://msdn.microsoft.com/en-us/library/bb694531%28VS.85%29.aspx#BC5 Block Compression: BC5] - documentation from the Microsoft Developer Network (MSDN).</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [http://developer.nvidia.com/object/real-time-normal-map-dxt-compression.html Real-Time Normal Map DXT Compression] - whitepaper from id software & Nvidia; section 3.3 describes 3Dc.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td></tr>
</table>
EricChadwick
http://wiki.polycount.com/w/index.php?title=3Dc&diff=120&oldid=prev
EricChadwick: syntax
2010-08-22T20:21:02Z
<p>syntax</p>
<table class='diff diff-contentalign-left'>
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<col class='diff-marker' />
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 20:21, 22 August 2010</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 7:</td>
<td colspan="2" class="diff-lineno">Line 7:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>  ''Maps of normals produce beautiful images but they almost double the texture volume. Maps of normals which do not cause artifacts must be stored in textures of 8 bits per channels at least (RGB8), or better of 16 bits (<del class="diffchange diffchange-inline">[[</del>G16R16<del class="diffchange diffchange-inline">]]</del>), like in all ATI's demos. In order to make the texture volume smaller the company carried out some experiments with DXTn formats (lossy compression called S3TC in OpenGL) and found out that the DXT5 was the most optimal: in this format each of two coordinates (x, y) is stored in its channel: color and alpha. In this format the memory size required is 4 times lower (32 bits against 8 bits)! As the further extension, ATI will support a new format in its new chips. It's based on the DXTC and previously named ATI2N. It differs from DXT5 in compression of only a color component (out of three) using the method identical for the alpha channel compression. The new format will tremendously increase the precision of compressed texture storage compared to the DXT5, with the size being the same.''</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>  ''Maps of normals produce beautiful images but they almost double the texture volume. Maps of normals which do not cause artifacts must be stored in textures of 8 bits per channels at least (RGB8), or better of 16 bits (<ins class="diffchange diffchange-inline">!</ins>G16R16), like in all ATI's demos. In order to make the texture volume smaller the company carried out some experiments with DXTn formats (lossy compression called S3TC in OpenGL) and found out that the DXT5 was the most optimal: in this format each of two coordinates (x, y) is stored in its channel: color and alpha. In this format the memory size required is 4 times lower (32 bits against 8 bits)! As the further extension, ATI will support a new format in its new chips. It's based on the DXTC and previously named ATI2N. It differs from DXT5 in compression of only a color component (out of three) using the method identical for the alpha channel compression. The new format will tremendously increase the precision of compressed texture storage compared to the DXT5, with the size being the same.''</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>----</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>----</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:TextureFormatRuntime]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:TextureFormatRuntime]]</div></td></tr>
</table>
EricChadwick
http://wiki.polycount.com/w/index.php?title=3Dc&diff=119&oldid=prev
EricChadwick: cleanups
2010-08-22T20:20:29Z
<p>cleanups</p>
<table class='diff diff-contentalign-left'>
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<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr style='vertical-align: top;'>
<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 20:20, 22 August 2010</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It <del class="diffchange diffchange-inline">is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''. </del></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It is a two-component compression format using the same technique as <ins class="diffchange diffchange-inline">[[DXT#</ins>DXT5<ins class="diffchange diffchange-inline">|DXT5]] </ins>alpha<ins class="diffchange diffchange-inline">, </ins>designed for compressing [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]<ins class="diffchange diffchange-inline">. It is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''</ins>.  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">3Dc </del>is a two-component compression format using the same technique as DXT5 alpha<del class="diffchange diffchange-inline">. It is </del>designed for compressing [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]].</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.</div></td></tr>
</table>
EricChadwick
http://wiki.polycount.com/w/index.php?title=3Dc&diff=118&oldid=prev
EricChadwick: better info, BC5 link
2010-08-22T20:18:58Z
<p>better info, BC5 link</p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr style='vertical-align: top;'>
<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 20:18, 22 August 2010</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It <del class="diffchange diffchange-inline">has been re-branded by AMD </del>as ''ATI2N''. <del class="diffchange diffchange-inline">It </del>is a two-component compression format using the same technique as DXT5 alpha<del class="diffchange diffchange-inline">, is eight bits per pixel, and </del>is designed for compressing [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]. <del class="diffchange diffchange-inline">  </del></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI). It <ins class="diffchange diffchange-inline">is also known </ins>as ''ATI2N<ins class="diffchange diffchange-inline">'' and in DirectX 10 it's known as ''BC5</ins>''.  </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">3Dc </ins>is a two-component compression format using the same technique as DXT5 alpha<ins class="diffchange diffchange-inline">. It </ins>is designed for compressing [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [http://msdn.microsoft.com/en-us/library/bb694531%28VS.85%29.aspx#BC5 Block Compression: BC5] - documentation from the Microsoft Developer Network (MSDN).</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:</div></td></tr>
</table>
EricChadwick
http://wiki.polycount.com/w/index.php?title=3Dc&diff=117&oldid=prev
EricChadwick: more info
2010-08-22T20:07:36Z
<p>more info</p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 20:07, 22 August 2010</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>= 3Dc =</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI).</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI)<ins class="diffchange diffchange-inline">. It has been re-branded by AMD as ''ATI2N''. It is a two-component compression format using the same technique as DXT5 alpha, is eight bits per pixel, and is designed for compressing [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]].  </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">* </del>[http://<del class="diffchange diffchange-inline">developer.amd</del>.com/<del class="diffchange diffchange-inline">gpu</del>/<del class="diffchange diffchange-inline">compress</del>/<del class="diffchange diffchange-inline">Pages/default</del>.<del class="diffchange diffchange-inline">aspx ATI_Compress</del>] <del class="diffchange diffchange-inline">- </del>texture <del class="diffchange diffchange-inline">compression library that has documentation about 3Dc</del>.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">Notes from an ATI presentation at the </ins>[http://<ins class="diffchange diffchange-inline">ixbtlabs</ins>.com/<ins class="diffchange diffchange-inline">articles2</ins>/<ins class="diffchange diffchange-inline">kri</ins>/<ins class="diffchange diffchange-inline">kri2004</ins>.<ins class="diffchange diffchange-inline">html Russian Game Developers Conference' 2004</ins>]<ins class="diffchange diffchange-inline">:</ins></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">* </del>[<del class="diffchange diffchange-inline">http</del>:<del class="diffchange diffchange-inline">//en</del>.<del class="diffchange diffchange-inline">wikipedia</del>.<del class="diffchange diffchange-inline">org/wiki/3Dc Wikipedia 3Dc page] - information about 3Dc</del>.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"> ''Maps of normals produce beautiful images but they almost double the </ins>texture <ins class="diffchange diffchange-inline">volume</ins>. <ins class="diffchange diffchange-inline">Maps of normals which do not cause artifacts must be stored in textures of 8 bits per channels at least (RGB8), or better of 16 bits (</ins>[<ins class="diffchange diffchange-inline">[G16R16]]), like in all ATI's demos. In order to make the texture volume smaller the company carried out some experiments with DXTn formats (lossy compression called S3TC in OpenGL) and found out that the DXT5 was the most optimal</ins>: <ins class="diffchange diffchange-inline">in this format each of two coordinates (x, y) is stored in its channel: color and alpha</ins>. <ins class="diffchange diffchange-inline">In this format the memory size required is 4 times lower (32 bits against 8 bits)! As the further extension, ATI will support a new format in its new chips</ins>. <ins class="diffchange diffchange-inline">It's based on the DXTC and previously named ATI2N. It differs from DXT5 in compression of only a color component (out of three) using the method identical for the alpha channel compression. The new format will tremendously increase the precision of compressed texture storage compared to the DXT5, with the size being the same</ins>.<ins class="diffchange diffchange-inline">''</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:TextureFormatRuntime]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:TextureFormatRuntime]]</div></td></tr>
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EricChadwick
http://wiki.polycount.com/w/index.php?title=3Dc&diff=116&oldid=prev
EricChadwick: new page
2010-08-03T13:54:10Z
<p>new page</p>
<p><b>New page</b></p><div>__NOTOC__<br />
= 3Dc =<br />
3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI).<br />
<br />
* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that has documentation about 3Dc.<br />
* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - information about 3Dc.<br />
<br />
----<br />
[[Category:TextureFormatRuntime]]</div>
EricChadwick