puzzlecutlib rendering problem & STL export error Current top level object is empty.
Hi:
Hoping some one can help me out. I did search for this error, and did find
other people with similar problem but no real solution that applies to my
problem.
I have downloaded puzzlecutlib.scad from thiniverse in order to cut up an
stl model that is slightly too big for my 3D printer. I was able to get the
puzzle cut where I wanted it after a bit of tweaking of the code. Including
changing the "child" statements in the library file to "children" to
eliminate one error. I also modified the puzzlecutdemo2.scad and added
translate([70,0,-22]) at the bottom of the code that imports the stl because
the model was importing in the wrong alinement with the puzzle cut.
I now have it just the way I want it. But I have a problem rendering it. I
get this error with F6:
"Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: pe_prev->is_border() ||
!internal::Plane_constructor::get_plane(pe_prev->facet(),pe_prev->facet()->plane()).is_degenerate()
File:
/opt/mxe/usr/i686-w64-mingw32.static/include/CGAL/Nef_3/polyhedron_3_to_nef_3.h
Line: 251
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: pe_prev->is_border() ||
!internal::Plane_constructor::get_plane(pe_prev->facet(),pe_prev->facet()->plane()).is_degenerate()
File:
/opt/mxe/usr/i686-w64-mingw32.static/include/CGAL/Nef_3/polyhedron_3_to_nef_3.h
Line: 251
Geometries in cache: 14
Geometry cache size in bytes: 415712
CGAL Polyhedrons in cache: 12
CGAL cache size in bytes: 152016
Total rendering time: 0 hours, 0 minutes, 2 seconds
Rendering finished."
I seem to have solve that error by saving the file with a new name. I now
get a different error, I can not see the model after hitting F6 unless I
select preview. And I get this error when I try to export to STL:
"Current top level object is empty. " when trying to export as STL.
The code for both files are listed below:
puzzlecutdemo2.scad:
//OpenSCAD PuzzleCut Library Demo - by Rich Olson
//http://www.nothinglabs.com
//Tested on build 2012.08.22
//License: http://creativecommons.org/licenses/by/3.0/
//demo object "Bucket O' Octopodes (thicker legs)" -
http://www.thingiverse.com/thing:8896
//NOTE: Complex objects may result in "normalized tree" errors / rendering
problems
//These can be worked around by doing a full render (just hit F6)
include <puzzlecutlib.scad>
stampSize = [500,500,70]; //size of cutting stamp (should cover 1/2 of
object)
cutSize = 8; //size of the puzzle cuts
xCut1 = [-58 ,-5 ,-30]; //locations of puzzle cuts relative to X axis center
yCut1 = [-4, 5, 16]; //for Y axis
kerf = 0; //supports +/- numbers (greater value = tighter fit)
//using a small negative number may be useful to assure easy fit for 3d
printing
//using positive values useful for lasercutting
//negative values can also help visualize cuts without seperating
pieces
cutInTwo(); //cuts in two along y axis
//cutInFour(); //cuts in four along x / y axis
//comment out lines as needed to render individual pieces
module cutInTwo()
{
translate([0,-20,0])
xMaleCut() drawOcto();
translate([0,0,0])
xFemaleCut() drawOcto();
}
module cutInFour()
{
translate([6,-6,0])
xMaleCut() yMaleCut() drawOcto();
translate([-6,-6,0])
xMaleCut() yFemaleCut() drawOcto();
translate([6,6,0])
xFemaleCut() yMaleCut() drawOcto();
translate([-6,6,0])
xFemaleCut() yFemaleCut() drawOcto();
}
module drawOcto()
{
rotate ([0,-90,90]) translate([70,0,-22]) import("Cycl_XleftFrame-base
cut.stl");
}
puzzlecutlib.scad:
//OpenSCAD PuzzleCut Library Demo - by Rich Olson
//http://www.nothinglabs.com
//Tested on build 2012.08.22
//License: http://creativecommons.org/licenses/by/3.0/
module xMaleCut(offset = 0, cut = xCut1)
{
difference()
{
children(0);
translate([0,offset,0]) makePuzzleStamp(cutLocations = cut);
}
}
module xFemaleCut(offset = 0, cut = xCut1)
{
intersection()
{
children(0);
translate([0,offset,0]) makePuzzleStamp(cutLocations = cut,
kerf = kerf); //only set kerf on female side
}
}
module yMaleCut(offset = 0, cut = yCut1)
{
difference()
{
children(0);
rotate ([0,0,90]) translate([0,offset,0]) makePuzzleStamp(cutLocations =
cut);
}
}
module yFemaleCut(offset = 0, cut = yCut1)
{
intersection()
{
children(0);
rotate ([0,0,90]) translate([0,offset,0]) makePuzzleStamp(cutLocations =
cut,
kerf = kerf); //only set kerf on female side
}
}
module makePuzzleStamp(kerf = 0)
{
difference()
{
//make the cube
translate ([0,stampSize[0] / 2 - kerf,0])
cube (stampSize, center = true);
//make the cuts
for ( i = cutLocations )
{
translate([i,0,0])
cube ([(cutSize / 2) - kerf * 2, cutSize - kerf * 2,stampSize[2]],
center = true);
translate([i,cutSize / 2,0])
cube ([cutSize - kerf * 2,(cutSize / 2) - kerf * 2, stampSize[2]],
center = true);
}
}
}
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Your STL is probably invalid, check it with Netfabb Basic, or share it here.
I seem to have solve that error by saving the file with a new name. I now
get a different error, I can not see the model after hitting F6 unless I
select preview. And I get this error when I try to export to STL:
"Current top level object is empty. " when trying to export as STL.
The F6 is cached, so you don't get the error again unless you clear cache or
exit/rerun OpenSCAD. (a flaw IMO).
Object is empty because F6 failed.
Admin - PM me if you need anything, or if I've done something stupid...
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Hi MichaelAtOz:
The stl file I am trying to use the puzzlecut plugin on originally came from
netfabb. So the stl should be valid. I'll attach all the files I am using
below. Hopefully you can see the error.
I don't see the problem, but then again I'm fairly new to OpenSCAD.
I even asked the author of the plugin, but he has not posted anything on his
block for nearly a year. So seems like he is MIA. Thanks.
Cycl_XleftFrame-base_cut.stl
http://forum.openscad.org/file/n17443/Cycl_XleftFrame-base_cut.stl
puzzlecutlib.scad http://forum.openscad.org/file/n17443/puzzlecutlib.scad
puzzlecutdemo2-cut.scad
http://forum.openscad.org/file/n17443/puzzlecutdemo2-cut.scad
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Well the STL doesn't show any issues in Meshlab or Netfabb Basic.
But doing
translate([60,10,-10])
import("td17440 Cycl_XleftFrame-base_cut2.stl");
cube([10,20,5]);
Causes the error. So CGAL doesn't like it.
The error '->plane()).is_degenerate() ' points to degenerate faces, but
these usually are detected by Netfabb.
Meshmixer says it has repaired the file, but unfortunately it doesn't tell
what it did or what was wrong.
So I ran it thru Netfabb online https://netfabb.azurewebsites.net/ and
it now works.
Here is the fixed file td17440_Cycl_XleftFrame-base_cut_fixed.stl
http://forum.openscad.org/file/n17444/td17440_Cycl_XleftFrame-base_cut_fixed.stl
Admin - PM me if you need anything, or if I've done something stupid...
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!
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Hi MichaelAtOz:
I looked at the td17440_Cycl_XleftFrame-base_cut_fixed.stl file and it did
not have the puzzle cuts. So I opened in OpenSCAD and tried to render and
then export to stl. Here is the result:
Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
ERROR: CGAL error in CGALUtils::applyBinaryOperator difference: CGAL ERROR:
assertion violation! Expr: cet->get_index() == ce->twin()->get_index() File:
/opt/mxe/usr/i686-w64-mingw32.static/include/CGAL/Nef_3/SNC_external_structure.h
Line: 1169
ERROR: CGAL error in CGALUtils::applyBinaryOperator intersection: CGAL
ERROR: assertion violation! Expr: cet->get_index() ==
ce->twin()->get_index() File:
/opt/mxe/usr/i686-w64-mingw32.static/include/CGAL/Nef_3/SNC_external_structure.h
Line: 1169
ERROR: CGAL error in CGALUtils::applyBinaryOperator union: CGAL ERROR:
assertion violation! Expr: G.mark(v1,0)==G.mark(v2,0)&&
G.mark(v1,1)==G.mark(v2,1) File:
/opt/mxe/usr/i686-w64-mingw32.static/include/CGAL/Nef_S2/SM_overlayer.h
Line: 287
Geometries in cache: 14
Geometry cache size in bytes: 466976
CGAL Polyhedrons in cache: 12
CGAL cache size in bytes: 2695800
Total rendering time: 0 hours, 0 minutes, 15 seconds
Rendering finished.
Current top level object is empty.
As you can see I am still getting the CGAL error along with the object is
empty error when I try to export. I should mention I am using OpenSCAD
version 2015.03-2. And I'm on a 32bit version of windows. Did you try
exporting the part with the puzzle cuts to stl? Or did you just run the
unmodified stl through netfabb online?
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FourthDr wrote
As you can see I am still getting the CGAL error along with the object is
empty error when I try to export.
Well you're getting different CGAL errors. The object will always be empty
with CGAL errors.
Did you try exporting the part with the puzzle cuts to stl? Or did you
just run the unmodified stl through netfabb online?
I didn't try puzzlecut.
I ran your STL thru Netfabb online, then used it with my code above, to
confirm that the error '->plane()).is_degenerate() ' was fixed.
So puzzlecut is now getting a different error;
ERROR: CGAL error in CGALUtils::applyBinaryOperator difference: CGAL ERROR:
assertion violation! Expr: cet->get_index() == ce->twin()->get_index() File:
/opt/mxe/usr/x86_64-w64-mingw32.static/include/CGAL/Nef_3/SNC_external_structure.h
Line: 1169
which I don't recall seeing before. So this is now beyond me.
Can someone else have a look. Fixed STL is above.
I cut the code back to a minimalish;
// Cut down version of below for testing
//OpenSCAD PuzzleCut Library Demo - by Rich Olson http://www.nothinglabs.com
//License: http://creativecommons.org/licenses/by/3.0/
stampSize = [200,200,50]; //size of cutting stamp (should cover 1/2 of
object)
difference()
{
rotate ([0,-90,90])
translate([70,0,-22])
import("td17440 Cycl_XleftFrame-base_cut_fixed.stl", convexity=8);
// -
difference()
{
translate ([0,stampSize[0] / 2,0])
cube (stampSize, center = true);
// -
translate([0,0,0])
cube ([4, 8 ,stampSize[2]+2], center = true);
}
}
Admin - PM me if you need anything, or if I've done something stupid...
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!
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Hi MichaelAtOz:
Thanks for the old college try. Seems like I've spent way too much of your
time and mine on this. What should have been a quick cut and export is
turning into a week frustration with no end in sight. Maybe you could
recommend another piece of software that would let me quickly break an STL
into two interlocking pieces? I have only two more parts this one and one
other to print so I can complete my project. And this problem preventing
from moving forward.
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I was about to say "How much strength do you need? You could glue them. With
ABS two pieces joined with acetone are melted into one piece." but I tried a
simple split which failed too.
It is a problem with the STL, I suspect other tools may have a problem too.
There are CAD tools you could use, but I'm not up to date on the best for
this.
Others here could suggest.
You could export the makePuzzleStamp(cutLocations = cut); shape then try a
boolean in the CAD program.
For others. Cut down some more, note error occurs with intersection too;
stampSize = [170,100,50]; //size of cutting stamp (should cover 1/2 of
object)
//difference()
intersection()
{
rotate ([0,-90,90])
translate([70,0,-22])
import("td17440 Cycl_XleftFrame-base_cut_fixed.stl", convexity=8);
// -
translate ([0,stampSize[1] / 2,0])
cube (stampSize, center = true);
// -
}
Admin - PM me if you need anything, or if I've done something stupid...
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!
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Hi MichaelAtOz:
I thought about gluing the parts together, but I don't think that would work
very will with PLA. The parts are for the Cyclone PCB Factory. Basically a
mini milling machine for PCB's and other light materials like acrylic wood
etc.. The parts are for the X axis, so they need to be solid enough for
left-right motion and to support a Dremel on top. An interlocking cut would
make the two parts stronger than just glue. I suppose I could screw them
together. It just would have been so much more elegant to be able to make
the puzzle cut. You would think this problem comes up frequently enough that
some of the major 3D software publishers would have a built-in solution for
when a part is too big to print.
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This repaired version seems to work. With Michael's version I got the error
message but instead of an empty object I got something that looked like the
original. I exported that and repaired it in Netfabb. That version will
then cut with Michael's test.
On 29 May 2016 at 08:36, FourthDr who_doctor@hotmail.com wrote:
Hi MichaelAtOz:
I thought about gluing the parts together, but I don't think that would
work
very will with PLA. The parts are for the Cyclone PCB Factory. Basically a
mini milling machine for PCB's and other light materials like acrylic wood
etc.. The parts are for the X axis, so they need to be solid enough for
left-right motion and to support a Dremel on top. An interlocking cut would
make the two parts stronger than just glue. I suppose I could screw them
together. It just would have been so much more elegant to be able to make
the puzzle cut. You would think this problem comes up frequently enough
that
some of the major 3D software publishers would have a built-in solution for
when a part is too big to print.
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