Divide by Zero Tangents

Pipeline
1

Although, this is obviously mathmatically correct, a user may want it do something different. Right now egg-trans -tbnall calculates normals and binormals correctly, but when a model is unwrapped such that 2 adjacent points occupy the same the UV coordinates, it obviously generates a divide zero problem and what gets output is -#IND, -#IND, -#IND

Perhaps it should do something else so that the model can be used?

2

Hmm, you’re right. Probably the only sensible thing to do is to pick an arbitrary vector in this case. I’ll make that change.

David

3

Is the tangent generation producing a tangent which is the average of the tangents of the adjacent polygons?

If so, could the formula simply ignore the degenerate polygon?