Someone knows how to implement an effect, such that the edges of a surface patch are highlighted when the patch is under the cursor. I know how to pick the patch, but not sure if I can highlight and de-highlight the edges, which are linestrips, without redraw the whole scene.
Hmm… you mentioned patch specifically, well you could still use a 1D texture function to map the patch edges. If it isn’t subdivided sufficiently then a 2D function would work, or even multipass on the patch for each edge with a 1D function.