On 12/05/2014 05:52 PM, wmartin wrote:

Currently that's not possible.

https://github.com/openscad/openscad/issues/391 is did not succeed in
attracting developers yet ;-).

Without looking at the model, it's hard to guess what the cause could
be. Crashes could be caused by recursion using up the stack (fix for that
is on the way) or it could be due to bad geometry generated, e.g. due
to rounding issues...

ciao,
Torsten.

I would be happy to post the model file, if that is ok for this list. It
is very small. It is
also my very first model generation attempt! Liking this SCAD program.
-bill

On 12/05/2014 09:31 AM, Torsten Paul wrote:

wmartin wrote

Feel free to share it.

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. This work is published globally via the internet. :) Inclusion of works of previous authors is not included in the above.

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wmartin wrote

Feel free to share it.
oz.at.michael@gmail.com

Ok, since it is so tiny I'll just paste it inline.
BTW: the t_len variable is desired to be 420mm.

-bill

echo(version=version());

t_len = 105;
seg_h = 6;              //6mm tall ring segment
base = seg_h/2;        //get back to zero on Z axis
ID = 48;                //main tube ID
OD = 50;              //main tube OD
h_cc = 6;              //center-to-center perforation spacing
h_dia = 3;              //perforation hole diameter
p_deg = 360/(PIOD/h_cc);    //degrees between perf holes
n_rot = floor(PIOD/h_cc) -1;      //inner loop count

//weird, but it does the job!
function O(cnt) = cnt*p_deg/2 ; //rotate around the tube this much
"extra" each ring segment along length

module perf_tube()
{
difference() {
translate( [0, 0, t_len/2] )
union() {
difference() {
cylinder(h = t_len, d=OD, $fn=100, center = true);
cylinder(h = t_len, d=ID, $fn=100, center = true);
}
}

     for ( j = [0 : t_len/seg_h] ) {
         translate( [0, 0, (j*seg_h) + base] )
         for ( i = [ 0 : n_rot ] ) {
             rotate( [90, 0, i*p_deg + O(j)] )
             translate( [0, 0, (ID+OD)/4] )
             cylinder(h = OD-ID+1, d = h_dia, $fn=100, center = true);
         }
      }
  }

}

perf_tube();

That's strange, I got noheads email (below), but it is not posted here???

I agree, but with $fn=10 everywhere it is still behaving badly.

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. This work is published globally via the internet. :) 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/

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Ok, thanks for taking a look. I'm not intending to
"manufacture" as in 3-d printing, just create a good mesh file
to input to the SU2 code from Stanford. Once I get the file format
into something SU2 likes...
-bill
ps: recommended version of openSCAD?

On 12/05/2014 03:26 PM, MichaelAtOz wrote:

wmartin wrote

Current snapshot 2014.12.04  here http://www.openscad.org/downloads.html
, may have some features to handle memory better and performance is better
too.

I'm running Win 7/64 OpenSCAD 64bit, I used the 2014.03 Production Release.

With slightly modified code (incl somewhat lower $fn values), I just did a
t_len = 420, F6 (no F5) it took 2h 14m 38s, and used 1.55GB of memory. That
has 1750 holes and taxes OpenSCAD, F5 is useless and F6 takes a long time.

The export to STL took a few minutes and not much more memory.

Do you want this STL (ie a bit chunkier than yours but looks OK to me)?

I'm going to try refactoring to see if there is a better way.

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. This work is published globally via the internet. :) 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/

View this message in context: http://forum.openscad.org/memory-use-32-bit-Linux-system-version-2014-10-02-tp10374p10392.html
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