3Dc - Revision history

EricChadwick at 14:10, 12 August 2015

2015-08-12T14:10:06Z

EricChadwick: removed old wiki syntax

2015-08-12T14:09:47Z

removed old wiki syntax

Cheeseplus: 7 revisions

2014-07-29T08:36:29Z

7 revisions

EricChadwick: Real-Time Normal Map DXT Compression link fixed

2011-04-06T13:06:56Z

Real-Time Normal Map DXT Compression link fixed

EricChadwick: revised, plus more links

2010-09-21T17:07:27Z

revised, plus more links

EricChadwick: syntax

2010-08-22T20:21:02Z

syntax

EricChadwick: cleanups

2010-08-22T20:20:29Z

cleanups

EricChadwick: better info, BC5 link

2010-08-22T20:18:58Z

better info, BC5 link

EricChadwick: more info

2010-08-22T20:07:36Z

more info

EricChadwick: new page

2010-08-03T13:54:10Z

new page

New page

__NOTOC__
= 3Dc =
3Dc is a compressed texture file format for [[NormalMap|normal maps]] by [http://developer.amd.com AMD] (formerly ATI).

* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that has documentation about 3Dc.
* [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - information about 3Dc.

----
[[Category:TextureFormatRuntime]]

@@ Line 7: / Line 7: @@
 Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:
- ''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.''
 ----
 [[Category:TextureFormatRuntime]]

← Older revision		Revision as of 14:09, 12 August 2015
Line 1:		Line 1:
−	~~__NOTOC__~~
−	~~= 3Dc =~~
	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''.		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''.
	* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - a texture compression library that handles 3Dc.		* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - a texture compression library that handles 3Dc.

@@ Line 2: / Line 2: @@
 = 3Dc =
 Dc 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''.
-* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.
+* [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - a texture compression library that handles 3Dc.
-* [http://developer.nvidia.com/object/texture_tools.html NVIDIA Texture Tools] - texture compression library that handles 3Dc.
+* [http://developer.nvidia.com/gpu-accelerated-texture-compression NVIDIA Texture Tools] - a texture compression library that handles 3Dc.
 * [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.
 * [http://msdn.microsoft.com/en-us/library/bb694531%28VS.85%29.aspx#BC5 Block Compression: BC5] - documentation from the Microsoft Developer Network (MSDN).
-* [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.
+* [http://developer.download.nvidia.com/whitepapers/2008/real-time-normal-map-dxt-compression.pdf Real-Time Normal Map DXT Compression] (PDF) - a whitepaper from id software & Nvidia; section 3.3 describes 3Dc.
 Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:

@@ Line 1: / Line 1: @@
 __NOTOC__
 = 3Dc =
-Dc 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 [[DXT#DXT5|DXT5]] alpha, designed for compressing [[NormalMap#Tangent-space_normal_map|tangent-space normal maps]]. It is also known as ''ATI2N'' and in DirectX 10 it's known as ''BC5''.
+Dc 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''.
 * [http://developer.amd.com/gpu/compress/Pages/default.aspx ATI_Compress] - texture compression library that handles 3Dc.
 * [http://en.wikipedia.org/wiki/3Dc Wikipedia 3Dc page] - more information about 3Dc.
 * [http://msdn.microsoft.com/en-us/library/bb694531%28VS.85%29.aspx#BC5 Block Compression: BC5] - documentation from the Microsoft Developer Network (MSDN).
 Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:

@@ Line 7: / Line 7: @@
 Notes from an ATI presentation at the [http://ixbtlabs.com/articles2/kri/kri2004.html Russian Game Developers Conference' 2004]:
-  ''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.''
+  ''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.''
 ----
 [[Category:TextureFormatRuntime]]

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