Hi Sebastian,
OSGSurface is indeed derived from OSGGeometry, so the normal accessor
functions should be
used for getting the tessellated geometry. I don't know why exactly
the crash happens, but you don't have to downcast your OSGSurfacePtr
to OSGGeometryPtr, the getPositions() etc. functions should work on
an OSGSurface.
HTH,
Akos
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