Hi, I am trying to implement Cubic Environment Map Bump Mapping for the Utah teapot. The teapot data consists of 32 bezier patches. I had evaluated these bezier patches and calculated the vertices (x, y, z) and their corresponding texture coordinates (s, t). Given 4 vertices and their texture coordinates how to compute the Tangent space (Tangent, Binormal and Normal) at each vertex. All the methods that I found on the internet describe the scheme for triangles. I think I can use the same method but I just want to make sure if that is correct. All comments would be of help! Thanks!

Hi,

Was my question stupid ? or everybody just sneaked with the triangles ?

Need some feedback please!

Thanks!

You should definitely be able to compute this directly from the patch information, since the Bezier patch is a smooth 2D manifold that is at least C2.

Cheers,

Timkin

Hi Timkin,

Lets say we have 4 vertices and their texture coordinates of a quad (no Bezier or anything). How to find the TBN for this quad ?

Thanks!