Here's my simple code.  I.e., put a lion shape on a block:

filename="lion.svg";
fudge=0.05;

union(){
translate([0,0,.25-fudge])
resize([15,10,1])
linear_extrude(height=1)
import(file = filename,center=true);

           cube([20,15,.5],center=true);

}

This code previews perfectly but when rendered produces the error:
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: e->incident_sface() != SFace_const_handle() File:
/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_S2/SM_const_decora
tor.h Line: 329

Comment out the cube and it renders fine.

Thoughts?
Ken

That worked! Thanks.

From: nop head nop.head@gmail.com
Sent: Sunday, October 11, 2020 10:31 AM
To: OpenSCAD general discussion discuss@lists.openscad.org
Subject: Re: [OpenSCAD] more SVG problems

Looks like the svg has self intersections in its outline. Try offsetting it by a tiny amount. That passes it through clipper, which is good at sorting out self-intersections.

On Sun, 11 Oct 2020 at 16:02, <ken@volksswitch.org mailto:ken@volksswitch.org > wrote:

Here's my simple code.  I.e., put a lion shape on a block:

filename="lion.svg";
fudge=0.05;

union(){
translate([0,0,.25-fudge])
resize([15,10,1])
linear_extrude(height=1)
import(file = filename,center=true);

           cube([20,15,.5],center=true);

}

This code previews perfectly but when rendered produces the error:
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: e->incident_sface() != SFace_const_handle() File:
/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_S2/SM_const_decora
tor.h Line: 329

Comment out the cube and it renders fine.

Thoughts?
Ken

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