I have OpenSCAD 2015.3-2. The STL was repaired in MS 3D Builder, and again with NetFabb Online Service. STL, and pictures of error attached. Getting Error: ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion violation! Expr: e->incident_sface() != SFace_const_handle() File: /opt/mxe/usr/x86_64-w64-mingw32.static/include/CGAL/Nef_S2/SM_const_decorator.h Line: 326 A google search revealed: https://github.com/openscad/openscad/issues/1090 Any tips to getting this to work? Thank you very much, Ari M. Diacou //////////////////////// Code //////////////////////////// /////////////////// Parameters ////////////////////////// neck_width=4; $fn=24; /////////////// Derived Parameters ////////////////////// w=neck_width; ///////////////////// Main() //////////////////////////// color("gray")ball_joint(); color("NavajoWhite"){ neck(); head(); } /////////////////// Functions /////////////////////////// module head(){ translate([.6,0,.6]) rotate([0,-5,0]) scale(.17) import("Head 3_fixed.stl",convexity=8); } module neck(){ w1=.64*w; a=0.8; b=0.85; w2=a*w1; rotate([0,-atan((w1-w2)/2/w1),0]) scale([1,b,1]){ translate([0,0,0]) sphere(d=w1); translate([0,0,0]) cylinder(d1=w1,d2=w2,h=w1); translate([0,0,w1]) sphere(d=w2); } } module ball_joint(){ translate([0,0,-w/2]) cylinder(d=w,h=w/2); translate([0,0,-w/2]) sphere(d=w); } ///////////////////////////// Console ////////////////////// Compiling design (CSG Tree generation)... Rendering Polygon Mesh using CGAL... ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion violation! Expr: e->incident_sface() != SFace_const_handle() File: /opt/mxe/usr/x86_64-w64-mingw32.static/include/CGAL/Nef_S2/SM_const_decorator.h Line: 326 Geometries in cache: 102 Geometry cache size in bytes: 33869136 CGAL Polyhedrons in cache: 20 CGAL cache size in bytes: 20900192 Total rendering time: 0 hours, 0 minutes, 4 seconds Top level object is a 3D object: Simple: yes Vertices: 627 Halfedges: 2704 Edges: 1352 Halffacets: 1460 Facets: 730 Volumes: 2 Rendering finished. ///////////////////////////////// Library Info ////////////////////////////////// OpenSCAD Version: 2015.03-2 System information: Windows 8 (v6.2.0.0) 4 CPUs 6.96 GB RAM Compiler: GCC "5.2.0" 64bit Boost version: 1_57 Eigen version: 3.2.5 CGAL version, kernels: 4.5, Cartesian, Extended_cartesian, Epeck OpenCSG version: OpenCSG 1.4.0 Qt version: 5.5.1 QScintilla version: 2.8.4 MingW build: MingW64 GLib version: 2.44.1 Application Path: C:/Program Files/OpenSCAD Documents Path: C:\Users\kimbe\Documents Resource Path: C:/Program Files/OpenSCAD User Library Path: C:/Users/kimbe/Documents/OpenSCAD/libraries User Config Path: C:\Users\kimbe\AppData\Local/OpenSCAD Backup Path: C:/Users/kimbe/Documents/OpenSCAD/backups OPENSCADPATH: OpenSCAD library path: C:/Users/kimbe/Documents/OpenSCAD/libraries C:/Program Files/OpenSCAD\libraries OPENSCAD_FONT_PATH: OpenSCAD font path: GLEW version: 1.12.0 OpenGL Version: 4.5.13469 Compatibility Profile Context 21.19.512.0 GL Renderer: AMD Radeon(TM) R4 Graphics GL Vendor: ATI Technologies Inc. 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On 28. mars 2018 15:50, Ari Diacou wrote: > I have OpenSCAD 2015.3-2. The STL was repaired in MS 3D Builder, and > again with NetFabb Online Service. STL, and pictures of error attached. > > Getting Error: > ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion > violation! Expr: e->incident_sface() != SFace_const_handle() File: > /opt/mxe/usr/x86_64-w64-mingw32.static/include/CGAL/Nef_S2/SM_const_decorator.h > Line: 326 > > A google search revealed: https://github.com/openscad/openscad/issues/1090 > > Any tips to getting this to work? > > Thank you very much, > > Ari M. Diacou There are several issues with this STL file, automatic repair is unlikely to work. In short there are overlapping faces, so it cannot be interpreted as 2-manifold. One example is shown in the attached 2 images, where one of the overlaps is indicated (there are several others). I think you will have to fix the problem in the software that generated the original head model. Carsten Arnholm

Thanks, I'll see what I can do. On Wed, Mar 28, 2018, 2:05 PM Carsten Arnholm <arnholm@arnholm.org> wrote: > On 28. mars 2018 15:50, Ari Diacou wrote: > > I have OpenSCAD 2015.3-2. The STL was repaired in MS 3D Builder, and > > again with NetFabb Online Service. STL, and pictures of error attached. > > > > Getting Error: > > ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion > > violation! Expr: e->incident_sface() != SFace_const_handle() File: > > > /opt/mxe/usr/x86_64-w64-mingw32.static/include/CGAL/Nef_S2/SM_const_decorator.h > > Line: 326 > > > > A google search revealed: > https://github.com/openscad/openscad/issues/1090 > > > > Any tips to getting this to work? > > > > Thank you very much, > > > > Ari M. Diacou > > There are several issues with this STL file, automatic repair is > unlikely to work. In short there are overlapping faces, so it cannot be > interpreted as 2-manifold. > > One example is shown in the attached 2 images, where one of the overlaps > is indicated (there are several others). I think you will have to fix > the problem in the software that generated the original head model. > > > Carsten Arnholm > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >