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[burak er <question240509@xxxxxxxxxxxxxxxxxxxxx>]

New question #240509 on Yade:
https://answers.launchpad.net/yade/+question/240509

Dear Yade-Dev,

I have problems with rendering of faces of my deformable tetrahedron class that I defined within yade.  Within deformable tetrahedrons, each vertex is defined in a list and each face of the deformable tetrahedron also defined in another list including it's connected vertex indices. I create tetrahedrons by importing mesh from a gmsh file where its node numbering order is given in gmsh's manual.

When I try to give opengl the normal of each face with the calculating method given here[1]  or even calculating it  with the node numbering as given in the user manual of gmsh , I see the coloring difference of the tetrahedrons faces. My drawing function of the deformable elements can be found here[2].

So I want to ask; What may cause the difference of the colors of the faces of tetrahedron with the code given at[2]? Do you suggest a better way  to draw a tetrahedron?

[1]http://math.stackexchange.com/questions/183030/given-a-tetrahedron-how-to-find-the-outward-surface-normals-for-each-side
[2]https://github.com/burak-er/trunk/blob/master/pkg/dem/deformablecohesive/Gl1_DeformableElement.cpp

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