Warp Merge Shader - Revision history

Redmaw: Added example images and conformed page layout.

2021-08-03T19:27:58Z

Added example images and conformed page layout.

Matt at 01:58, 4 May 2018

2018-05-04T01:58:25Z

Matt: Reformatting

2017-11-07T03:24:01Z

Reformatting

Matt at 03:02, 7 November 2017

2017-11-07T03:02:14Z

Matt at 03:01, 7 November 2017

2017-11-07T03:01:25Z

Matt at 02:57, 7 November 2017

2017-11-07T02:57:50Z

Matt at 02:50, 7 November 2017

2017-11-07T02:50:41Z

Matt: Difference between Warp Input Shader and Warp Merge Shader

2017-11-07T02:50:06Z

Difference between Warp Input Shader and Warp Merge Shader

Matt at 03:25, 5 May 2017

2017-05-05T03:25:23Z

Matt: Typo 'effects'

2017-05-05T03:22:39Z

Typo 'effects'

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-[[Image:drex_module_166_image_0.png|center|Warp Merge Shader]]
+[[File:WarpMerge_00_GUI.png|none|470px|Warp Merge Shader
 The Warp Merge Shader performs a domain distortion on the shader attached to its '''Shader''' input, using the displacement vectors from the shader attached to its '''Warper''' input. It does this by offsetting the texture coordinates before they are used by the shader. This almost looks like the warper bends the final result, but it's actually bending the space before it is read by the shader. A simplistic way you can think about it is that the shapes from the warper will bend the final texture (but in the opposite direction).
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 * The [[Warp Input Shader]] warps the shader attached to the main input ('''Input node''') and any shaders further upstream of the main input.
 * The Warp Merge Shader warps the shader attached to the '''Shader''' input and any shaders further upstream of that input (in other words a "side branch"). It merges the side branch with the main input, but only the side branch is warped.
-When the Warp Merge Shader is asked to shade or displace a point, the following happens. First, like most other shaders in Terragen, the Warp Merge Shader calls the shader connected to its main input. The main input is not warped. Then "warper" is called to produce a displacement vector. To produce the warp effect the warper must be a displacement shader or a network of shaders producing displacement. The displacement is not applied to the surface; its vector is merely stored for the next step. Next, the texture coordinates ("position in texture") are offset by the displacement vector, and then "shader" is called. The shader now produces different results because it works with modified texture coordinates. Finally, the texture coordinates are reset so that shaders following the Warp Merge Shader will not be affected.
+{|
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-===Exceptions===
+'''Settings:'''
 Some shaders are not always affected by warp shaders, depending on their settings:
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 * Twist and Shear Shader - uses world space
 * Visualise Normal - normals are not changed by warp shaders

← Older revision		Revision as of 01:58, 4 May 2018
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−	[[Category:~~Other~~ Shader]]	+	[[Category:Warp Shader]]

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 [[Image:drex_module_166_image_0.png|center|Warp Merge Shader]]
 The Warp Merge Shader performs a domain distortion on the shader attached to its '''Shader''' input, using the displacement vectors from the shader attached to its '''Warper''' input. It does this by offsetting the texture coordinates before they are used by the shader. This almost looks like the warper bends the final result, but it's actually bending the space before it is read by the shader. A simplistic way you can think about it is that the shapes from the warper will bend the final texture (but in the opposite direction).
@@ Line 9: / Line 8: @@
 * The Warp Merge Shader warps the shader attached to the '''Shader''' input and any shaders further upstream of that input (in other words a "side branch"). It merges the side branch with the main input, but only the side branch is warped.
 When the Warp Merge Shader is asked to shade or displace a point, the following happens. First, like most other shaders in Terragen, the Warp Merge Shader calls the shader connected to its main input. The main input is not warped. Then "warper" is called to produce a displacement vector. To produce the warp effect the warper must be a displacement shader or a network of shaders producing displacement. The displacement is not applied to the surface; its vector is merely stored for the next step. Next, the texture coordinates ("position in texture") are offset by the displacement vector, and then "shader" is called. The shader now produces different results because it works with modified texture coordinates. Finally, the texture coordinates are reset so that shaders following the Warp Merge Shader will not be affected.
-You may see the Warp Merge Shader and the [[Redirect Shader]] used in the same context. The reason the Warp Merge Shader and the [[Redirect Shader]] often work well together is because the [[Redirect Shader]] allows you to construct displacement vectors which go in all directions, which can be useful for warping a 3D function such as the Power Fractal. If you just use a single fractal operating along the normal as your warper, you might not easily see its warping effect.
+'''Tip 1:''' If you have a colour shader, colour function, scalar function or vector function that you want to use as your warper, you can turn it into displacement using a [[Displacement Shader]] or a [[Vector Displacement Shader]].
 Some shaders are not always affected by warp shaders, depending on their settings:
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 <ul>
 <li>
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 </li>
 </ul>
 [[Category:Other Shader]]

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 * The [[Warp Input Shader]] warps the shader attached to the main input ('''Input node''') and any shaders further upstream of the main input.
-* The Warp Merge Shader warps the shader attached to the '''Shader''' input and any shaders further upstream of that input (in other words a "side branch"). It merges the side branch with the main input, but it warps only the side branch, not the main input.
+* The Warp Merge Shader warps the shader attached to the '''Shader''' input and any shaders further upstream of that input (in other words a "side branch"). It merges the side branch with the main input, but only the side branch is warped.
 See also: [[Warp Input Shader]]

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 The difference between the [[Warp Input Shader]] and the Warp Merge Shader is:
-* The [[Warp Input Shader]] warps the shader attached to the main input ('''Input node''') and any shaders further upstream of that input.
+* The [[Warp Input Shader]] warps the shader attached to the main input ('''Input node''') and any shaders further upstream of the main input.
-* The Warp Merge Shader warps the shader attached to the '''Shader''' input and any shaders further upstream of that input. It merges a side branch of shaders with the input, but it warps only the side branch, not the main input.
+* The Warp Merge Shader warps the shader attached to the '''Shader''' input and any shaders further upstream of that input (in other words a "side branch"). It merges the side branch with the main input, but it warps only the side branch, not the main input.
 See also: [[Warp Input Shader]]

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 <ul>
 <li>
-'''Warper:''' The shader attached to this input generates the warp or distortion which affects the node attached to the '''Shader''' input.
+'''Warper:''' The shader attached to this input generates displacement vectors which define the warp or distortion effect.
 </li><li>
-'''Shader:''' The shader attached to this input is the one which is effected by the '''Warper''' shader.
+'''Shader:''' The shader attached to this input becomes warped, and so do its inputs.
 </li>
 </ul>