@kleerkoat wrote:
i have a script here that splits objects by the construction plane. when i split a solid the script sometimes creates a planar surface that i don’t want. (possible bug?)
is there a way within the script to have it filter the output and delete those surfaces?
the function are called SplitObjectsWithLine but it actually uses the cplane, i just haven’t cleaned it up yet
"""Splits selected objects with the CPlane of the active viewport. Objects can be curves, surfaces, polysurfaces or meshes. Script by Mitch Heynick version 29.01.17.""" import rhinoscriptsyntax as rs import scriptcontext as sc import Rhino def FixDegenerateBB(bb,plane,tol): #expands degenerate (0 length side) bounding box in the required direction(s) #returns fixed bounding box or original if nothing needs to be done if bb[1].DistanceTo(bb[2])<tol: t_vec=plane.YAxis bb[2]+=t_vec ; bb[3]+=t_vec ; bb[6]+=t_vec ; bb[7]+=t_vec bb[0]-=t_vec ; bb[1]-=t_vec ; bb[4]-=t_vec ; bb[5]-=t_vec if bb[0].DistanceTo(bb[1])<tol: t_vec=plane.XAxis bb[1]+=t_vec ; bb[2]+=t_vec ; bb[5]+=t_vec ; bb[6]+=t_vec bb[0]-=t_vec ; bb[3]-=t_vec ; bb[4]-=t_vec ; bb[7]-=t_vec if bb[0].DistanceTo(bb[4])<tol: t_vec=plane.ZAxis bb[4]+=t_vec ; bb[5]+=t_vec ; bb[6]+=t_vec ; bb[7]+=t_vec bb[0]-=t_vec ; bb[1]-=t_vec ; bb[2]-=t_vec ; bb[3]-=t_vec return bb def SplitObjsWithLine(): msg="Select curves, surfaces or meshes to split with CPlane" objIDs=rs.GetObjects(msg,4+8+16+32,preselect=True) if not objIDs: return tol=sc.doc.ModelAbsoluteTolerance cut_plane=rs.ViewCPlane() sf=1.1 #scale factor for enlarging cut plane - can be changed #principal problem from here is can't split breps or meshes with plane object #need to create a planar *surface* or *mesh* to use as cutter #create cutting objects #get objs bb relative to cutting plane bb=rs.BoundingBox(objIDs,cut_plane) #need to expand 0 length sides to work with completely planar situations bb=FixDegenerateBB(bb,cut_plane,tol) #create planar projection to cut plane xform_cut=rs.XformPlanarProjection(cut_plane) #create bb bottom rectangle(points), project to cut plane corners=rs.PointArrayTransform([bb[0],bb[1],bb[2],bb[3],bb[0]],xform_cut) #get center point for uniform scale ctr_pt=(corners[0]+corners[2])/2 #create cutting plane rectangle cut_rect=Rhino.Geometry.PolylineCurve(corners) #scale rectangle a bit larger to ensure full cut xform_scale=Rhino.Geometry.Transform.Scale(ctr_pt,sf) cut_rect.Transform(xform_scale) #create plane brep for cutter cut_srf=Rhino.Geometry.Brep.CreatePlanarBreps(cut_rect)[0] #create mesh plane for cutter mp=Rhino.Geometry.MeshingParameters.Coarse cut_mesh=Rhino.Geometry.Mesh.CreateFromPlanarBoundary(cut_rect,mp) #sc.doc.Objects.AddBrep(cut_srf) #debug #sc.doc.Objects.AddMesh(cut_mesh) #debug #sc.doc.Views.Redraw() ; return #debug #main loop rs.EnableRedraw(False) split_result=[] no_split=0 for objID in objIDs: rhobj=rs.coercerhinoobject(objID,True,True) attrs=rhobj.Attributes obj=rhobj.Geometry if rs.IsCurve(objID): split_res=obj.Split(cut_srf,tol) if split_res: for crv in split_res: split_result.append(sc.doc.Objects.AddCurve(crv,attrs)) rs.DeleteObject(objID) else: no_split+=1 elif rs.IsBrep(objID): if isinstance(obj,Rhino.Geometry.Extrusion): if obj.HasBrepForm: obj=obj.ToBrep() else: no_split+=1 ; continue split_res=Rhino.Geometry.Brep.Split(obj,cut_srf,tol) if split_res: for brep in split_res: cap=brep.CapPlanarHoles(tol) if cap: brep=cap split_result.append(sc.doc.Objects.AddBrep(brep,attrs)) rs.DeleteObject(objID) else: no_split+=1 elif rs.IsMesh(objID): split_res=Rhino.Geometry.Mesh.CreateBooleanSplit([obj],[cut_mesh]) if split_res: for mesh in split_res: split_result.append(sc.doc.Objects.AddMesh(mesh,attrs)) rs.DeleteObject(objID) else: no_split+=1 #reporting if split_result: splits=len(objIDs)-no_split if splits>1: s="s" else: s="" msg="{} object{} split into {} parts.".format(splits,s,len(split_result)) if no_split>0: msg+=" {} objects unable to be split".format(no_split) #rs.SelectObjects(split_result) #optional else: msg="No objects were split" print msg SplitObjsWithLine()
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