Error Illegal Polygonal Object
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Sign in Pricing Blog Support Search GitHub This repository Watch 173 Star 1,372 Fork 398 openscad/openscad Code Issues 394 Pull requests 55 Projects 1 Wiki Pulse Graphs New issue Export creates non-manifold STLs [$15] #13 Open triffid opened this Issue May 27, 2011 · 13 comments Projects None yet Labels Bounty CGAL STL-related Milestone No milestone Assignees No one assigned 6 participants triffid commented May 27, 2011 example: x-end-motor.scad from http://github.com/prusajr/PrusaMendel/ render succeeds, export to STL succeeds, opening the generated STL in openscad (import_stl) succeeds, compile of stl succeeds, render of stl fails with "ERROR: Illegal https://groups.google.com/d/topic/makerbot/H2BwMN9nwdE polygonal object - make sure all polygons are defined with the same winding order." Feeding the stl to cloud.netfabb.com and saving the result allows openscad to render successfully. The object looks identical in openscad's 3d view throughout the entire process Update Feb 2016: issue13c.scad is currently the only failing testcase. The issue is a collapsed volume (two back-to-back triangles. There is a $15 open bounty on this https://github.com/openscad/openscad/issues/13 issue. Add to the bounty at Bountysource. GilesBathgate commented May 27, 2011 Maybe better to join the openscad mailing list and send this issue there: http://rocklinux.net/mailman/listinfo/openscad openscad member kintel commented Sep 8, 2011 After investigating this for a bit, I've come to the conclusion that the internal mesh handling in OpenSCAD is slightly broken when given geometry including very small triangles. The culprit seems to be some internal optimization done by the grid class. This will be tricky to clean up without breaking something else :/ triffid commented Sep 8, 2011 thanks for the update! I'm getting into the habit of running /everything/ through cloud.netfabb.com these days. I wonder if it would tell you anything useful to compare before and after from that process? openscad member kintel commented Sep 8, 2011 I've got myself a minimal example, so I think I'm good for now: cube(size = [10,10,5]); translate([5, 5, 8.1-9+0.9]) cube(size = [5,10,10]); alexrj commented Dec 5, 2011 Also, boolean operations result in a lot of overlapping facets! :) bwilson commented Feb 19, 2012 For me, OpenSCAD (2011.09.30) produces an STL file that contains a bad facet: facet normal 0 0 0 outer loop vertex 9.5 104.991 9.26462 vertex 9.5 1
2011 06:03AM Registered: 5 years ago Posts: 1,780 I wanted to http://forums.reprap.org/read.php?151,111640 remove some parts from the Prusa iteration 2 Mendel lm8uu http://forums.autodesk.com/t5/autocad-civil-3d-forum/illegal-self-intersecting-or-non-closed-boundary-polygon/td-p/1872938 plates and I got rendering errors in most of the files. For example, when rendering the x-end-motor.stl in mendel-plate-1, I get the following errors: ERROR: Illegal polygonal object - make sure all polygons are defined with the same winding order. error illegal Skipping affected object. I found a workaround by using Meslab to remove the unwanted parts and resaving the STL files but it would be nice to make it work in Openscad also. Reply Quote raldrich Re: Generating Prusa mendel plates December 31, 2011 05:06PM Registered: 5 years ago Posts: 179 error illegal polygonal I ran into the same issue, I suspect that there's an older version of OpenSCAD that works, but the latest one doesn't like to import it's own work. Looking through the sources, it appears that there are many places where the subtractive geometry is exactly the same size as the additive geometry, which can cause those kinds of errors. Reply Quote tinyenormous Re: Generating Prusa mendel plates January 23, 2012 11:37AM Registered: 5 years ago Posts: 60 I know you seem to be looking at creating the plates from the scad files, but plater.py in pronterface can build plates from stls fairly easily. The scad issue is avoidable provided you have the stl files and dont need to change anything. Reply Quote Newer Topic Older Topic Print View RSS Sorry, only registered users may post in this forum. Click here to login This forum is powered by Phorum.
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