Hi, I am creating a star shaped polyhedron (that is raised in the middle of the star) that renders fine when its all alone. When I try to add another object (like a cylinder with the object - creating a small ring at the tip of the star), it will preview fine, but will not render both objects together. I can comment out either one and the other renders fine. Here is the design, any ideas? : // Thickness of the star (mm). star_height=15; // Radius of the star's inner vertices. inner_radius=20; // Radius of the star's outer most edges. outer_radius=45; star(); star_holder(); module star_holder() { difference() { translate([0,outer_radius+1,0]) cylinder(r=4,h=1); translate([0,outer_radius+1,0]) cylinder(r=2.5,h=1); } } module star() { polyhedron(points=[ [0, 0, star_height], [ 0 * outer_radius, 1.0 * outer_radius], [ 0.588 * inner_radius, 0.81 * inner_radius], [ 0.951 * outer_radius, 0.31 * outer_radius], [ 0.951 * inner_radius,-0.31 * inner_radius], [ 0.588 * outer_radius,-0.81 * outer_radius], [ 0 * inner_radius,-1.0 * inner_radius], [-0.588 * outer_radius,-0.81 * outer_radius], [-0.951 * inner_radius,-0.31 * inner_radius], [-0.951 * outer_radius, 0.31 * outer_radius], [-0.588 * inner_radius, 0.81 * inner_radius] ], faces=[ [0,1,2], [0,2,3], [0,3,4], [0,4,5], [0,5,6], [0,6,7], [0,7,8], [0,8,9], [0,9,10], [0,10,1], [2,4,6,8,10], [10,1,2],[2,3,4],[4,5,6],[6,7,8],[8,9,10],[2,4,6,8,10] ],convexity=10); } -- View this message in context: http://forum.openscad.org/Problem-Rendering-Polyhedron-with-another-object-tp10568.html Sent from the OpenSCAD mailing list archive at Nabble.com.

Hi! On 12/16/2014 11:59 PM, tlizambri wrote: > I am creating a star shaped polyhedron (that is raised in the middle of the > star) that renders fine when its all alone. When I try to add another object > (like a cylinder with the object - creating a small ring at the tip of the > star), it will preview fine, but will not render both objects together. I > can comment out either one and the other renders fine. Here is the design, > any ideas? : > The bottom face is flipped, if you turn on "View -> Thrown Together" it will show in pinkish color. Reversing the order of the points for those faces should fix the issue. See also https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#polyhedron ciao, Torsten.

Why does the direction of the face matter? What's on the inside and outside appears obvious to me. -- View this message in context: http://forum.openscad.org/Problem-Rendering-Polyhedron-with-another-object-tp10568p10570.html Sent from the OpenSCAD mailing list archive at Nabble.com.

That worked. I guess I was looking at the bottom upside down. Thanks! -- View this message in context: http://forum.openscad.org/Problem-Rendering-Polyhedron-with-another-object-tp10568p10571.html Sent from the OpenSCAD mailing list archive at Nabble.com.