Mahmoud's Page

Hello Mahmoud

here is an image of what you want. 

No GH file given, it is best to understand what you are doing to make progress. Here are explanations. 

Area gives the center of each triangles

SurfCp gives UV coordinates of center points on surface

theses UV coordinates are transformed to a [0 1] domain in order to feed the input of image sampler (brightness output so sometimes 0.0)

Then a scale of triangles is done. (scale is red because some time scale factor is 0). Modifications is up to you.