When I import and XYZRGB (that I generate programatically), MeshLab renders the point-cloud, but the colors are missing. How can I assign textures/colors to vertices. I have tried "Vertex Attribute Transfer" but nothing happens.
Rename the extension .xyz to .txt. Then choose the x y z r g b option when importing the file. in meshlab
source: http://www.laserscanningforum.com/forum/viewtopic.php?f=168&t=8052