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I'd second that - it's superb.

In 2000 or so we were buying 21" Viewsonic CRT's for ~$1k a piece! Now I have three 25" screens that cost ~$900. A magical time we live in.

Very few properties of the geometry of 3D Solids are exposed to the LISP API: the DXF data contains the raw binary information defining the geometry and cannot be used directly, and the only useful ActiveX properties pertain to the mass properties of the solid, yielding similar data to that output by the standard MASSPROP command. As such, you'll need to extract the data you require using the properties exposed to the .NET API - gile has posted some useful functions in this regard here. Hope this helps.

I have a .lsp routine I found called CookieCutter2 v1.0.lsp It isn't mine but I modified it as to always ask if the user wants to convert solids to lines as to correctly trim back to the enclosed poly lines. It isn't perfect for the trimming part so I suggest using EXTRIM command for the trimming and this for the erasing. Also I have the PROJMODE variable set to 2 If you have it set to 0 or 1 you can get yourself into trouble with elevations. CookieCutter2 v1.0.lsp