Simple sweep

Rhino Developer
1

Is there a RhinoCommon method that will create a fully-defined simple sweep as such?

  • The rail is a border isocurve.
  • The shapes are all the isocurves intersecting the rail at its Greville points.
  • _Sweep1 and _Sweep2 (with default options) produce the same result.

Below is a script with both the CreateFromSweep method and SweepOneRail class. Neither produce the same result as _Sweep1 for the example geometry below.

Python script 
import Rhino.Geometry as rg
import rhinoscriptsyntax as rs
import scriptcontext as sc

def addBreps(rgBreps):
    if not rgBreps:
        print "Sweep failed."
        return
    else:
        for rgB in rgBreps:
            gB_Out = sc.doc.Objects.AddBrep(rgB)

def main():
    
    gRail = rs.GetObject("Select rail", filter=rs.filter.curve)
    if not gRail: return
    
    gShapes = rs.GetObjects("Select sweep shapes", filter=rs.filter.curve)
    if not gShapes: return
    
    rail = rs.coercecurve(gRail)
    shapes = [rs.coercecurve(g) for g in gShapes]
    
    addBreps(rg.Brep.CreateFromSweep(
        rail,
        shapes,
        closed=rail.IsClosed,
        tolerance=sc.doc.ModelAbsoluteTolerance))
    
    #    addBreps(rg.Brep.CreateFromSweep(
    #        rail,
    #        shapes,
    #        startPoint=rg.Point3d.Unset,
    #        endPoint=rg.Point3d.Unset,
    #        frameType=rg.SweepFrame.Freeform,
    #        roadlikeNormal=rg.Vector3d.ZAxis,
    #        closed=rail.IsClosed,
    #        blendType=rg.SweepBlend.Local,
    #        miterType=rg.SweepMiter.None,
    #        tolerance=sc.doc.ModelAbsoluteTolerance,
    #        rebuildType=rg.SweepRebuild.None,
    #        rebuildPointCount=0,
    #        refitTolerance=0.0))
    
    #    addBreps(rg.Brep.CreateFromSweepSegmented(
    #        rail,
    #        shapes,
    #        closed=rail.IsClosed,
    #        tolerance=sc.doc.ModelAbsoluteTolerance))
    
    rgSweep1 = rg.SweepOneRail()
    rgSweep1.ClosedSweep = rail.IsClosed
    rgSweep1.SweepTolerance = sc.doc.ModelAbsoluteTolerance
    addBreps(rgSweep1.PerformSweep(
        rail=rail,
        crossSections=shapes))
    
    sc.doc.Views.Redraw()

if __name__ == '__main__': main()

ForSimpleSweep.3dm (51.0 KB)

image

2

Hi @spb,

It appears that Brep.CreateFromSweep cannot create a “simple” sweep like the Sweep1 command can/does. I’ve logged the issue.

Thanks,

– Dale