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Set vertex color in CGA

TomasHlava

Hello,

Is it possible to set the vertex color of an object? I'm using color operation to set the color of my objects, but that sets the material color, not vertex color.

I was hoping its something simple like vertex.color("#ffffff"). But I couldn't find any mention of vertex colors in documentation or forums. So I suspect it's not currently possible in CityEngine.

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Anonymous User

Hmm, maybe comp(v){all: "#color" VertexColor.) might work. But you could also start with that and insert primitive cubes of a defined size (relative to your model scale) and color those.

Something like comp(v){all: "#color" primitiveCube(scale#,scale#))

TomasHlava

Thanks for your reply. Unfortunately, I wasn't able to make those functions work. I'll try to find some solution in 3dsMax.

Anonymous User

Sorry that didn't work, it was just a quick lead towards an answer.

Here is my idea to achieve some form of vertex coloring:

Model-->
	VertexSelection
	FaceSelection
	
VertexSelection-->	
	comp(v){all: VertexAction}
	
FaceSelection-->
	comp(f){all: FaceAction}
	
VertexAction-->
	color("#ff0000") 
	primitiveSphere(8,8,.05)
	center(xyz)

FaceAction-->
	color("#fafad2")

That code will produce tiny red primitiveSpheres at each vertex of your model. I thought the spheres looked more natural than the cubes.

TomasHlava

I'm sorry, I did a bad job explaining what I'm trying to do.

I meant this kind of vertex color http://wiki.polycount.com/wiki/Vertex_color. I want to use vertex colors for buildings. It should be cheaper than using many differently colored textures and materials.

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