Driving Parameter Values with Vertex Colors
You can drive many mappable parameters with a vertex color property in the same way as with parameter maps. In such cases, a Map Adaptor property is automatically added to control how colors are converted to values.
Add a vertex color property to an object and paint on it as desired. See Vertex Painting Workflow Overview.
Connect a mappable parameter to the vertex color property. See Connecting Maps.
Select a Conversion from RGB method on the Map Adaptor property page.
Specifying Vertex Color Properties in Property Editors
Many properties and shaders require you to specify a vertex color property for various purposes. For example, you can use vertex colors for U and V basis maps when baking surface properties with RenderMap or RenderVertex.
For information about specifying vertex color properties in property editors, see Specifying Parameter Maps or Vertex Colors in Property Editors.
Rendering Vertex Colors as Surface Color
You can render vertex colors as the surface color if desired. You can also use vertex colors to drive other parameters in a render tree.
CAV property applied to a sphere, a seen in constant display mode.
CAV property applied to a sphere, a seen in rendered in the render region.
On the Get Texture menu of the Render toolbar, make sure that Diffuse is checked, as well as any other material ports that you want to drive with the same CAV property.
Choose Get Texture Color Map Lookup from the Render toolbar.
A Map Lookup Color shader is applied and connected to the specified material ports. The Map Lookup Color property editor is displayed.
In the shader's property editor, specify a map. See Specifying Parameter Maps or Vertex Colors in Property Editors.
Using Vertex Colors to Drive Other Render Tree Parameters
You can use vertex colors to drive other render tree parameters in the same way as parameter maps. See Using Parameter Maps or Vertex Colors in the Render Tree.