DuDv map - Revision history

EricChadwick: wiki cleanup

2014-11-30T01:49:44Z

wiki cleanup

Throttlekitty at 19:46, 17 August 2014

2014-08-17T19:46:44Z

Throttlekitty: +1 link

2014-08-17T19:46:22Z

+1 link

Throttlekitty: Throttlekitty moved page DuDvMap to DuDv map: Convert old>new space and case.

2014-08-14T16:27:11Z

Throttlekitty moved page DuDvMap to DuDv map: Convert old>new space and case.

Throttlekitty at 16:22, 14 August 2014

2014-08-14T16:22:40Z

Throttlekitty at 16:22, 14 August 2014

2014-08-14T16:22:08Z

Throttlekitty at 16:18, 14 August 2014

2014-08-14T16:18:50Z

Cheeseplus: 8 revisions

2014-07-29T08:42:29Z

8 revisions

EricChadwick: related

2012-05-07T18:22:38Z

EricChadwick at 12:55, 6 April 2011

2011-04-06T12:55:01Z

@@ Line 1: / Line 1: @@
 DuDv is a simple way to use one texture to distort the pixels of another texture. Common uses are the heat haze above a fire, ripples refracting what's under the water, thick wavy glass distorting what's behind it, etc.
-{| border="1" cellpadding="2" cellspacing="0"
+[[image:dudv_leonard.jpg|frame|left|A DuDv map, the framebuffer texture that will be distorted, and the final scene. [http://decadeengine.blogspot.com/2007/09/gpu-rendered-water.html Video available here]. Images by [http://decadeengine.blogspot.com/ John Leonard].]]<br clear="all"/>
-|-
-|}
 A DuDv map is similar to a normal map in that it stores directional information in a texture, except mostly just the Red and Green channels are used, so the bitmap has a red/yellow/green look. A DuDv map is actually a derivative of a [[Normal map]], and can easily be created with a variety of tools. It's usually best to blur the texture before converting it, to reduce the "jaggedness" of the distortion effect.
@@ Line 14: / Line 8: @@
 The texture that's being distorted by the DuDv map is usually either a pre-created reflection map (like a [[Cube Map]]), or better yet a real-time rendered framebuffer of the rest of the scene. To do the latter, a special render is set up for each frame by rendering just what is going to be reflected or refracted. To save on render time often the scene is set to its lowest LOD for this special render and non-essential meshes are excluded. The rendered image is projected onto the surface from the camera's point of view, then the DuDv texture is used to distort it.
 == DuDv tools ==
@@ Line 21: / Line 18: @@
 * [http://www.renderingsystems.com/support/showthread.php?tid=3 ShaderMap] ($) by Rendering Systems
 * DuDv maps can be manually created in Photoshop or PaintShop Pro:
- .1. Start with a [[NormalMap]].
+*# Start with a [[Normal map]].
- .2. Image->Adjustments->Invert (Photoshop) or Colors->Negative Image (PaintShop Pro).
+*# Image->Adjustments->Invert (Photoshop) or Colors->Negative Image (PaintShop Pro).
- .3. Image->Adjustments->Brightness&Contrast (Photoshop) or Colors->Adjust->Brightness/Contrast (PaintShop Pro). Raise the contrast as high as it will go.
+*# Image->Adjustments->Brightness&Contrast (Photoshop) or Colors->Adjust->Brightness/Contrast (PaintShop Pro). Raise the contrast as high as it will go.
 == Related Pages ==
@@ Line 33: / Line 30: @@
 * [[Vector displacement map]]
 ----
-[[Category:Texturing]] [[Category:TextureTypes]] [[Category:Bump map]]
+[[Category:TextureTypes]] [[Category:Bump map]]

@@ Line 31: / Line 31: @@
 * [[Normal map]]
 * [[Radiosity normal map]]
 [http://simonschreibt.de/gat/007-legends-the-world/ Has some animated examples]
 ----
 [[Category:Texturing]] [[Category:TextureTypes]] [[Category:Bump map]]

@@ Line 31: / Line 31: @@
 * [[Normal map]]
 * [[Radiosity normal map]]
 * [[Vector displacement map]]
 ----
 [[Category:Texturing]] [[Category:TextureTypes]] [[Category:Bump map]]

@@ Line 1: / Line 1: @@
 __NOTOC__
 <!-- ## page was renamed from [[DuDv]] Map -->
-= [[DuDv]] Map =
+= DuDv map =
 DuDv is a simple way to use one texture to distort the pixels of another texture. Common uses are the heat haze above a fire, ripples refracting what's under the water, thick wavy glass distorting what's behind it, etc.
@@ Line 15: / Line 15: @@
 The texture that's being distorted by the DuDv map is usually either a pre-created reflection map (like a [[Cube Map]]), or better yet a real-time rendered framebuffer of the rest of the scene. To do the latter, a special render is set up for each frame by rendering just what is going to be reflected or refracted. To save on render time often the scene is set to its lowest LOD for this special render and non-essential meshes are excluded. The rendered image is projected onto the surface from the camera's point of view, then the DuDv texture is used to distort it.
-== [[DuDv]] Tools ==
+== DuDv tools ==
 * [http://developer.nvidia.com/nvidia-texture-tools-adobe-photoshop Normal Map filter for Photoshop] by NVIDIA

@@ Line 9: / Line 9: @@
 |}
-A DuDv map is similar to a normal map in that it stores directional information in a texture, except mostly just the Red and Green channels are used, so the bitmap has a red/yellow/green look. A DuDv map is actually a derivative of a [[NormalMap]], and can easily be created with a variety of tools. It's usually best to blur the texture before converting it, to reduce the "jaggedness" of the distortion effect.
+A DuDv map is similar to a normal map in that it stores directional information in a texture, except mostly just the Red and Green channels are used, so the bitmap has a red/yellow/green look. A DuDv map is actually a derivative of a [[Normal map]], and can easily be created with a variety of tools. It's usually best to blur the texture before converting it, to reduce the "jaggedness" of the distortion effect.
-DuDv works in similar way to how a [[ParallaxMap]] distorts a surface, except DuDv doesn't take the viewing angle into consideration (no parallax) it just shifts the pixels of the reflection map before it's applied onto the mesh. The method is basically fetching Du and Dv from the DuDv map, then for every pixel in the reflection map, adding Du to the reflection map's U texture coordinate and adding Dv to its V coordinate, which then offsets the reflection map pixels, creating the distortion.
+DuDv works in similar way to how a [[Parallax map]] distorts a surface, except DuDv doesn't take the viewing angle into consideration (no parallax) it just shifts the pixels of the reflection map before it's applied onto the mesh. The method is basically fetching Du and Dv from the DuDv map, then for every pixel in the reflection map, adding Du to the reflection map's U texture coordinate and adding Dv to its V coordinate, which then offsets the reflection map pixels, creating the distortion.
 The texture that's being distorted by the DuDv map is usually either a pre-created reflection map (like a [[Cube Map]]), or better yet a real-time rendered framebuffer of the rest of the scene. To do the latter, a special render is set up for each frame by rendering just what is going to be reflected or refracted. To save on render time often the scene is set to its lowest LOD for this special render and non-essential meshes are excluded. The rendered image is projected onto the surface from the camera's point of view, then the DuDv texture is used to distort it.
@@ Line 27: / Line 27: @@
 == Related Pages ==
 * [[Curvature map]]
-* [[DuDvMap]]
+* [[DuDv map]]
-* [[FlowMap]]
+* [[Flow map]]
-* [[NormalMap]]
+* [[Normal map]]
-* [[RadiosityNormalMap]]
+* [[Radiosity normal map]]
-* [[VectorDisplacementMap]]
+* [[Vector displacement map]]
 ----
-[[Category:Texturing]] [[Category:TextureTypes]] [[Category:BumpMap]]
+[[Category:Texturing]] [[Category:TextureTypes]] [[Category:Bump map]]

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