Fix Vertex Color Mode documentation

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -272,6 +272,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed remapping of depth pyramid debug view
 - Fixed an issue with asymmetric projection matrices and fog / pathtracing. (case 1330290).
 - Fixed gbuffer depth debug mode for materials not rendered during the prepass.
+- Fixed Vertex Color Mode documentation for layered lit shader.
 
 ### Changed
 - Changed Window/Render Pipeline/HD Render Pipeline Wizard to Window/Rendering/HDRP Wizard

com.unity.render-pipelines.high-definition/Documentation~/snippets/shader-properties/surface-inputs/layered-surface-inputs.md

@@ -6,7 +6,7 @@
 | **World Scale**                              | Set the world-space size of the Texture in meters. If you set this to **1**, then HDRP maps the Texture to 1 meter in world space.If you set this to **2**, then HDRP maps the Texture to 0.5 meters in world space.This property only appears when you select **Planar** or **Triplanar** from the **BlendMask UV Mapping** drop-down. |
 | **Tiling**                                   | Set an **X** and **Y** tile rate for the **Layer Mask** UV. HDRP uses the **X** and **Y** values to tile the Texture assigned to the **Layer Mask** across the Material’s surface, in object space. |
 | **Offset**                                   | Set an **X** and **Y** offset for the **Layer Mask** UV. HDRP uses the **X** and **Y** values to offset the Texture assigned to the **Layer Mask** from the Material’s surface, in object space. |
-| **Vertex Color Mode**                        | Use the drop-down to select the method HDRP uses to combine the **Layer Mask** to manager layer visibility.<br/>&#8226; **None**: Only the **Layer Mask** affects visibility. HDRP does not combine it with vertex colors.<br/>&#8226; **Multiply**: Multiplies the vertex colors from a layer with the corresponding values from the channel in the **Layer Mask** that represents that layer. The default value for a pixel in the mask is 1. Multiplying the vertex colors of a layer by the **Layer Mask** reduces the intensity of that layer, unless the value in the **Layer Mask** is 1.<br/>&#8226; **Add**: Remaps vertex color values to between 0 and 1, and then adds them to the corresponding values from the channel in the **Layer Mask** that represents that layer. **Layer Mask** values between 0 and 0.5 reduce the effect of that layer, values between 0.5 and 1 increase the effect of that layer. |
+| **Vertex Color Mode**                        | Use the drop-down to select the method HDRP uses to combine the **Layer Mask** to manager layer visibility.<br/>&#8226; **None**: Only the **Layer Mask** affects visibility. HDRP does not combine it with vertex colors.<br/>&#8226; **Multiply**: Multiplies the vertex colors from a layer with the corresponding values from the channel in the **Layer Mask** that represents that layer. The default value for a pixel in the mask is 1. Multiplying the vertex colors of a layer by the **Layer Mask** reduces the intensity of that layer, unless the value in the **Layer Mask** is 1.<br/>&#8226; **Add**: Remaps vertex color values to between -1 and 1, and then adds them to the corresponding values from the channel in the **Layer Mask** that represents that layer. Vertex color values between 0 and 0.5 reduce the effect of that layer, values between 0.5 and 1 increase the effect of that layer. |
 | **Main Layer Influence**                     | Enable the checkbox to allow the **Main Layer** to influence the albedo, normal, and height of **Layer 1**, **Layer 2**, and **Layer 3**. You can change the strength of the influence for each layer. |
 | **Use Height Based Blend**                   | Enable the checkbox to blend the layers with a heightmap. HDRP then evaluates the height of each layer to check whether to display that layer or the layer above. |
 | **Height Transition**                        | Use the slider to set the transition blend size between the Materials in each layer. |

com.unity.render-pipelines.high-definition/Runtime/Material/LayeredLit/LayeredLitData.hlsl

@@ -504,14 +504,10 @@ float4 GetBlendMask(LayerTexCoord layerTexCoord, float4 vertexColor, bool useLod
     // Settings this specific Main layer blend mask in alpha allow to be transparent in case we don't use it and 1 is provide by default.
     float4 blendMasks = useLodSampling ? SAMPLE_UVMAPPING_TEXTURE2D_LOD(_LayerMaskMap, sampler_LayerMaskMap, layerTexCoord.blendMask, lod) : SAMPLE_UVMAPPING_TEXTURE2D(_LayerMaskMap, sampler_LayerMaskMap, layerTexCoord.blendMask);
 
-    // Wind uses vertex alpha as an intensity parameter.
-    // So in case Layered shader uses wind, we need to hardcode the alpha here so that the main layer can be visible without affecting wind intensity.
-    // It also means that when using wind, users can't use vertex color to modulate the effect of influence from the main layer.
-    float4 maskVertexColor = vertexColor;
 #if defined(_LAYER_MASK_VERTEX_COLOR_MUL)
-    blendMasks *= saturate(maskVertexColor);
+    blendMasks *= saturate(vertexColor);
 #elif defined(_LAYER_MASK_VERTEX_COLOR_ADD)
-    blendMasks = saturate(blendMasks + maskVertexColor * 2.0 - 1.0);
+    blendMasks = saturate(blendMasks + vertexColor * 2.0 - 1.0);
 #endif
 
     return blendMasks;