CompuServe Messages

<< Im going to copy those questions down and use them to harrass anyone purporting to sell modeling software (G) >> <GGG> << Im not totally conversant (understatment ) with all the terms you use but my impression is that Trimming is not available in R3d for export to DXF. >> It's really a bit unusual that the current R3D release *does* feature an implementation of Trimmed Surfaces, since the current release uses Cubic Uniform Non-Rational B-Splines instead of NURBS (Non-Uniform Rational B-Splines). (The next version of R3D will feature a nice NURBS implementation). However, when the geometry is converted via DXF, any trimmed surface will export in it's un-trimmed state. But, as a sort-of work-around, in many cases you can export the developed surface and then the capped trim curves as planar polygons. Then, with some luck <g>, you can re-create the polygonal version of the trimmed surface using 3DS's Boolean Subtract operation, with the extruded or lofted trim polygons. << Any insights you could provide on how R3d shapes up to your question list would be helpful. Well, as I mentioned, R3D currently doesn't use NURBS, and my question list was pretty specific to NURBS. But, R3D does feature an extremely thorough implementation of "normal" B-Splines, as rarely seen elsewhere. IMO, "normal" B-Splines well-implemented with quality export to 3DS, is much more valuable than most any NURBS system which doesn't feature most *any one* of the features I outlined….especially if the connection with 3DS is not a strong one. Regards, BILL