What's the best way to pre generate procedural texture (with mesh stamping) at run time?

I have a need to create procedural texture at the initialization of a scene or an object, said texture may be generating by rendering many stamps that are 3d objects. What's the best way to do that? I have been trying to use drawmeshnow() but it's not working at all in build, and is unreliable in editor.

 

I'd use CommandBuffer.DrawMeshInstanced with CommandBuffer.SetRenderTarget to set up the render texture first.