Colors do not work with a mesh created in script?

Question

Hello,

I tried to generate mesh(just a triangle here) on the run from a script, and the colors don't work. The triangle appears always pink (looks like Color(255,0,255)). No matter what I set to the vertex colors to. Any idea why this could happen? Do I need to have a material/shader for this to work?

Here's the code

void Start() {

gameObject.AddComponent("MeshFilter"); gameObject.AddComponent("MeshRenderer"); Mesh mesh = GetComponent<MeshFilter>().mesh; mesh.Clear();

mesh.vertices = new Vector3[] { new Vector3(-0.5f, 0, 0), new Vector3(0, 1, 0), new Vector3(0.5f, 0, 0) };

mesh.normals = new Vector3[] { new Vector3(0, 0,-1), new Vector3(0, 0,-1), new Vector3(0, 0,-1) };

mesh.colors = new Color[] { new Color(0,0,0), new Color(0,0,0), new Color(0,0,0) };

mesh.triangles = new int[] { 0, 1, 2 };

}

Answer 1

Best Answer

Answer by Mike 3 · Mar 11, 2011 at 10:10 AM

Yup, pink generally means missing shader.

You'll want to add a material with a vertex coloured shader on - there are a few of them on the wiki if you don't have one, e.g:

http://www.unifycommunity.com/wiki/index.php?title=VertexColorUnlit

or

http://www.unifycommunity.com/wiki/index.php?title=VertexColor

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naro · Mar 11, 2011 at 11:19 AM 0

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Thanks! There first link provided me the answer :)

whaleinthesea · Oct 22, 2015 at 09:16 PM 0

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Links are dead, use http://wiki.unity3d.com/index.php?title=VertexColorUnlit & http://wiki.unity3d.com/index.php?title=VertexColor ins$$anonymous$$d.

Answer 2

Answer by naro · Mar 11, 2011 at 11:23 AM

Here's the shader which you need to use with the mesh if you want to display only the interpolated vertex colors:

Shader "MyShader/VertexColor" {

 Category {
     BindChannels { 
         Bind "Color", color 
         Bind "Vertex", vertex
     }
     SubShader { Pass { } }
 }

}

I'm totally new to Unity and shaderLab language so I wasn't aware of this binding thing at all :)

EDIT: added vertex binding too (otherwise you get shader errors)

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Answer 3

Answer by cupsster · Sep 12, 2013 at 11:21 PM

 mesh.colors = new Color[] { new Color(0,0,0,0), 
                             new Color(0,0,0,0), 
                             new Color(0,0,0,0) };

I think you are missing last digit (alpha value) from color definition in your array.

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Colors do not work with a mesh created in script?

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