Interpolate tangent/binormal

Questions & Answers
1

Is there any way to interpolate the tangent variable of a mesh? I am cutting vertices and I would like to recalculate as little as possble. Positions and UV mappings are done by Lerp, but what to do with the tangent?

Recalculating tangents is expensive.

Thanks

2

“Lerp” is fine if you normalize it in the shader. If not, “lerp”, then normalize.

Same for normals.

  • “lerp” is barycentric interpolation, but if you already had it figured out for other attributes, then I bet you had it for this too.