Setting the color array on a skinned mesh causes fps loss

Unity Engine
,
1

Hi guys, I’m using MeshMerger to create a skinned mesh from hundred of cubes.
This is the link for the merger:
http://wiki.unity3d.com/index.php?title=MeshMerger

I want to color each vertex and using it with a simple shader. I notice that assigning the mesh.colors causes a loss of 10fps on my game.
This is the snippet for the mesh config:

		// hook up the mesh
		Mesh me = new Mesh ();       
		me.name = gameObject.name;
		me.vertices = verts;
		me.normals = norms;
		me.boneWeights = weights;
		me.uv = uvs;
		me.colors32 = colors;
		me.bindposes = bindPoses;
		me.triangles = tris;
		me.Optimize();

and this is the shader:

Shader " Vertex Colored" 
{
    Properties {
        _Color ("Main Color", Color) = (1,1,1,1)
    }
    Category {
       Lighting On
       ColorMaterial AmbientAndDiffuse
       ZWrite On
       Cull Back
       Blend Off
       SubShader 
       {			
		Pass {
				SetTexture [_MainTex] {Combine texture * primary Double}
		}
        } 
    }
}

ColorMaterial AmbientAndDiffuse overwrite the ambient and diffuse color with the color of the vertex.
If I comment “me.colors32 = colors;” I get the original performance.
I don’t have a clue on what’s going on… assigning a color vertex shouldn’t affect the performance at all.
Any ideas?

2

Look at this post for more information. These guys use the Tangent property instead of Color to fix the FPS issue. You will need to update your shader accordingly. Let me know if it works:

http://forum.unity3d.com/threads/111870-Procedural-mesh-update-slow-on-iphone-4/page2

Look for the text