[Bf-cycles] mesh displacement update

[Mohamed Sakr]

Hi,

I have a Mesh that got displacement != none
first call means the Mesh is dirty , so I call mesh->tag_update(scene,
true);

now the problem happens when I don't touch the Mesh, what happens is it
stacks displacement from the previous render! "like an explosion".

ideas? what did I miss here.
I'm using March build "pre the Cycles 1.7 patch"

cheers,
Mohamed Sakr
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