How do I texture map a tube?

To texture-map a tube, it is necessary to compute appropriate values for s (horizontal texture coordinate) and t (vertical texture coordinate).  We’ll use a cylindrical mapping.



Imagine unfolding the tube to a 2D image.

• For s, it makes sense to have it 0 for the left side, and increase going to the right. Values for which s > 1 will cause the texture to repeat (if GL_REPEAT is on).
• One can specify t based on the length travelled along the centreline.  Values for which t > 1 will cause the texture to repeat (if GL_REPEAT is on).

High