Im importing some animations from 3DSMAX and noticed some wierd things:
I exported a mesh from 3DSMAX to my viewer. I rotated it 360º (glRotatef) and there was no problem. Then I tried exporting a rotating mesh (the animation was done in 3DSMAX) and noticed the back of the model was dark.
Do you know why? Should I calculate all normals each frame (or use a table for each frame)?