My material has bunch of 'windows' on it and between each of it, there is an alpha space ( which is empty, so u can see through it).
I usually put my material on the temporary face and draw lines following the windows so that i can use the specific window I want to use.
so I want to program draws line following the windows ( which really has image) on the face and throw the empty space and the edges of the temporary face only.
not sure i deliver my intend well...
but the problem is I can't figure out where the empty space is.
so can you recommend me how to read the alpha space from my materials ?
example of my materials