hi Luis,
I also understand that using pdata-set! we can access to a determined
vertex, but if we use pdata-map! all the vertices are going to be
modified, am I right??
yes, pdata-map! loops through all the vertices' pdata and sets the pdata
according to the function you specify.
For example, if in this code I replace the "(rndvec)" for a "(vector
1 3 0)", nothing happens:
you can't see anything, but what happens is that you set all the
vertices to the same coordinate (vector 1 3 0). that's why the sphere is
converted to a point that you cannot see.
hope it helps.
best,
gabor
