@Jean Lemire: very instructive! I function as a tester for Tgi3D so I find all sorts of strange Sketchup bugs. A few months ago I came across a SketchUp feature which could be considered a bug. Imagine you are performing a move rotate or scale operation inside a component instance, Sketchup inference engine allows you to snap on a feature in another instance of the same component (which potentially depends on the edit you are performing). You can have Sketchup solve equations for you (or draw a dodecohedron directly for that matter). drawing_a_dodecohedron.skp

[image: wrTW_pataan.jpg] Call it dumb luck, but I came across this post: http://groups.google.com/group/Sketchup-Pro/browse_thread/thread/ca7d0ba921af4611 Then I tried opening ArcScene, selected the tin surface, then added the face elevation with graduated color ramp from the symbology properties, and exported it in 3d vrml (.wrl). I then imported it in Blender 3d and exported it as collada (.dae). I don't know much about Blender 3d and I can't figure out how to display the imported data but just the same, I when I imported it to SketchUp, the surface was there together with the colors. Not as clean as the surveyor's version, but it is almost there. pataan.rar