How to ignore polys with a specific material when generating convex hulls for collision?

Development Asset Creation
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I’m using convex decomposition in the static mesh editor to generate collision hulls for some tree meshes. I’d like it to ignore parts of the mesh which have vegetation materials, so that the collision hull only includes the tree trunk and branches. I can’t find a way to do this in the editor. Is it possible, or is there some other way to achieve this?

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