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Add ability to override random number in Instanced Mesh.

I know there is a feture in InstancedStaticMesh component, which allow you get a per-instance random float for use in your material. It is very usefull, when you want to create some really random variations, but absolutely unusable when you need to create some pattern from your meshes, checkerboard for example.
So I suggest you to add a method to InstancedStaticMesh, which will allow to change that single float in vertex buffer data, similar to what UpdateInstanceTransform does.

+1

I second this request.