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investigate tangent generation failures
Lots of warnings confusing users.
Warnings like
com.jme3.util.mikktspace.MikktspaceTangentGenerator generate
SEVERE: Failed to generate tangents for geometry dsf_5
come from weird meshes like the high-poly 3DFE_GemHolder.kmf which is split into many submeshes some of which have empty "main" index buffers and only some of the LODs contain triangles.