hi opensg users,

i am doing some operations on models imported 
from obj files. When i do some tasks with normals and
indices, like swapping face normals, eventually i get
stuck in wrong displayed geometries.

i.e. the famous knot model from 3ds is displayed with 
most of the triangles missing or displaced.

Since i am having such problems just with OBJ imported
models, I was wondering what must be wrong with them.

My best shot is something about how triangles are defined,
like presence of TRIANGLES_STRIPS or TRIANGLES_FAN.
Is there a fast way to check the geometry node
vs triangle organization/indexing? And then for reducing
the geometry to simple list of triangles (which i assume 
would be safer to use during geometry manipulation)?

thanks,
E.


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