Model won't render
Trying to block some holes in preparation for replacing them with smaller
ones. I tried finding something wrong with the STL file imported, but
without an answer.
Previews fine but will not render. Throws an error and renders only the
cylinders I used to remove the holes.
Code:
union() {
translate([4.4,-29.7,4])
rotate([0,90,0])
cylinder(h=12.1,d=4.5);
translate([4.4,-29.7,30.2])
rotate([0,90,0])
cylinder(h=12.1,d=4.5);
import("Tusk Fan Shroud.stl",convexity = 10);
}
Error:
Parsing design (AST generation)...
Saved backup file:
C:/Users/Admin/Documents/OpenSCAD/backups/unsaved-backup-XmwNbxqL.scad
Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: e_below != SHalfedge_handle() File:
/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/SNC_FM_decorator.h
Line: 426
Geometries in cache: 21
Geometry cache size in bytes: 21410088
CGAL Polyhedrons in cache: 8
CGAL cache size in bytes: 294656
Total rendering time: 0 hours, 0 minutes, 7 seconds
Top level object is a 3D object:
Simple: yes
Vertices: 32
Halfedges: 96
Edges: 48
Halffacets: 40
Facets: 20
Volumes: 3
Rendering finished.
STL file too large to upload here. It's at
https://drive.google.com/drive/folders/0BxntGMCn8PVKOTFwU3F4NzNvNG8
Ideas?
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Works for me, with 2015.03-2 & 2019.05, Windows-7-64.
Want me to email the stl?
Admin - email* me if you need anything, or if I've done something stupid...
- click on my MichaelAtOz label, there is a link to email me.
Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
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MichaelAtOz wrote
Works for me, with 2015.03-2 & 2019.05, Windows-7-64.
oops.. my bad. I must have, at some point in my testing, saved a modified
"Tusk Fan Shroud.stl" over the original, and got the error trying to drill
new holes in it. Here's an OpenSCAD script that shows the error I was
seeing. Instructions are in the file.
// Instructions to duplicate problem:
// Display/preview with fill_holes() only
// Export as "Tusk Fan Shroud V1.stl"
// Preview with drill_new() only
// At this point, things get very slow.
// Dragging the model around in the preview is like it moving through
molasses.
// Render with drill_new() only
// This gives me the error.
// ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: e_below != SHalfedge_handle() File:
/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/SNC_FM_decorator.h
Line: 426
$fn = 30;
!fill_holes();
drill_new();
module fill_holes() {
import("Tusk Fan Shroud.stl", convexity = 100);
union() {
translate([4.46,-29.7,4])
rotate([0,90,0])
cylinder(h=11.99,d=4.5);
translate([4.46,-29.7,30.2])
rotate([0,90,0])
cylinder(h=11.99,d=4.5);
}
}
module drill_new() {
difference() {
import("Tusk Fan Shroud V1.stl", convexity = 100);
translate([4,-29.7,4])
rotate([0,90,0])
cylinder(h=13,d=3.5);
translate([4,-29.7,30.2])
rotate([0,90,0])
cylinder(h=13,d=3.5);
}
}
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The filled stl (...V1) has self intersections (SI's). Netfabb's definition of
such.
http://forum.openscad.org/file/t359/Capture_tusk_V1.jpg
The next question is why OpenSCAD exports SI's.
I suspect it is yet another small number floating point problem.
The original stl was very detailed. e.g.
http://forum.openscad.org/file/t359/Capture_tusk_orig.jpg
&
http://forum.openscad.org/file/t359/Capture_tusk_orig_b.jpg
Dragging the model around in the preview is like it moving through
molasses.
Probably convexity=100
Admin - email* me if you need anything, or if I've done something stupid...
- click on my MichaelAtOz label, there is a link to email me.
Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Sent from: http://forum.openscad.org/
Thanks Michael. I guess I'll make my own.
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