So I’ve noticed that if I scale negatively an instancedmesh. It creates a new draw call?
But if I scale positive, it doesn’t create a new draw call… only when negative.
I need to scale -1, to mirror an instancedMesh.
This part: “Instances with a world matrix where determinant is different than root mesh world matrix will be rendered separately (like a regular mesh). This mostly happens when the sign of the scaling vector is different between an instance and the root mesh.”
Oh… ok, didn’t know that.
Any ideas of how can we get a mirrored instanced mesh other than scaling -1 ?
Thanks for the explanation.
create 2 list of instances 
one with negative scale and one with positive. You ll end up having 2 draw calls only.
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