trim.rar (725.9 KB) this attachment has a trim.3dm file and some codes. in trim.3dm file,I have a curve named “Curve 1”,and two brep named “Brep 1” and “Brep 2”. Brep 1 is bulit using the Curve 1 through the funciton ON_Brep CsdrNurbsAlgorithm::ExtrudeCurveStraight( const ON_Curve pCurve, ON_3dVect…

trim2.3dm (1.6 MB) is new test 3dm file. these file has three little breps,and a big brep. I want using these little breps trim the big brep. or do RhinoBooleanUnion two litttle breps can do succes.but one little brep can,t please help me to see what the problem

The curve you used to create your extrusion is of very poor quality (a polycurve with 3 curves and 471 control points). When you extrude this curve, you end up with a Brep that contains 154 faces. It is this that is causing the problems with splitting and trimming. [image] Try rebuilding the curv…

thanks very much,this is a good idea.

dale: I have another problems about The parts of B that lie to inside RhinoBrepTrim function: question 1: trim.rar (1.2 MB) have three groups test data. the front two groups can the the inside parts of brep. but the third group get the outside parts of the group,why these happen? qusttion 2: Rh…

sorry this is urgent, kindly help have a look ASAP, thanks for your help

[image] dale: throwing away the piece you don’t want. but I don’t know How to find the piece I don’t want using c++ sdk function

Trim and Boolean brep

Rhino Developer

dale (Dale Fugier) September 30, 2013, 5:49pm 7

You might be better off splitting the brep, using RhinoBrepSplit, and then throwing away the piece you don’t want.

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Trim and Boolean brep

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