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Jaime Vives Piqueres
@jaimevives
That seems to be the case also on ubuntu 14.04... the package description says "This package contains the files needed to develop and compile programs using QGLViewer linked with Qt version 4."
Jakob Flierl
@koppi
I've updated the info at https://github.com/bullet-physics-playground/bpp/wiki/Build-on-Linux – currently testing this on Debian/Jessie..
Jakob Flierl
@koppi
I got it running now on Debian/Jessie with a workaround, see above link with updated info:
In case you have a version of the Debian package libqglviewer installed linked against Qt4 remove as a workaround: sudo apt remove --purge libqglviewer* # this will break other Debian / apps that require libqglviewer linked against Qt4 however.
Jaime Vives Piqueres
@jaimevives
After the "apt-get source libqglviewer-dev" step, I get lost... it creates a folder and other files:
libqglviewer-2.5.0+dfsg (folder)
libqglviewer_2.5.0+dfsg-1.debian.tar.xz
libqglviewer_2.5.0+dfsg-1.dsc
libqglviewer_2.5.0+dfsg.orig.tar.xz
Jaime Vives Piqueres
@jaimevives
Ok, I compiled and installed the one at libqglviewer-2.5.0+dfsg/QGLViewer ...let's see if bpp works now.
Seems to work now... at least it starts. I'm going for dinner and will start playing later.
Jakob Flierl
@koppi
Screenshot from 2016-05-06 04-51-17.png
Jakob Flierl
@koppi
A marble race with Duplo:
Screenshot from 2016-05-06 16-17-34.png
Jakob Flierl
@koppi
Screenshot from 2016-05-06 16-31-30.png
Jaime Vives Piqueres
@jaimevives
Very nice... seems you're having a lot of fun with openscad.
I only had time to play a bit with the new bpp, and just toyed a bit with the old samples: everything seems to work fine except for my car simulations, which are behaving very different and badly.
Jakob Flierl
@koppi
Screenshot from 2016-05-07 17-01-03.png
I'm currently fixing the POV-Ray mesh2 export..
Jaime Vives Piqueres
@jaimevives
Neat, this can save some external conversions.
BTW, openscad seems to not be working for me... when I load your demos I only get the plane. Should I install something for the openscad support?
Jakob Flierl
@koppi
There was a request on news.povray.org to export only one instance of the mesh2 if multiple Mesh() object instances have the same mesh data. But I did not yet figure out howto implement this.
http://www.openscad.org/ - a "$ sudo apt-get -y install openscad" should fix this.
it's a runtime dependency in BPP.
Jaime Vives Piqueres
@jaimevives
Thanks, I was just trying that...
Jakob Flierl
@koppi
did it work?
Jaime Vives Piqueres
@jaimevives
Hmmm... now loading the scene just makes bpp hang on the open script window.
About the mesh instancing, yes, it should be done that way. But I guess this could be done only if bpp allowed mesh instancing itself (it does? I don't remember).
Jakob Flierl
@koppi
when the gui freezes, wait a bit - openscad is running in the background
mesh instancing is not implemented yet. I need to think a bit howto do this in a correct way.
can you point me to the source code of other programs, that do mesh instancing?
Jaime Vives Piqueres
@jaimevives
I force closed the window... it was running for a few minutes already, so I thought it wasn't working.
Jakob Flierl
@koppi
openscad rendering should be creating the mesh within fractions of seconds.
the gui should not freeze, if you open 00-hello.lua (the version I updated a few minutes ago.)
Jaime Vives Piqueres
@jaimevives
I did try with 01-openscad-template and it worked, but it took a few seconds, and any change to the openscad code freezes bpp for a few seconds too. Looks like it's workig very slow on my system...
Jakob Flierl
@koppi
I could fix the gui freezes by introducing some multithreaded concepts, but I leave this part for now. The openscad package on Ubuntu 16.04 comes in the version 2015.03-1+df.
they have a google summer of code project, where they are trying to do the cgal calculations in a multithreaded manner.
in bpp, once the openscad stl is calculated it gets cached in ~/.cache/*.stl ..
Jakob Flierl
@koppi
in openscad there's the $fn variable that controls the number of facetes that get calculated: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/The_OpenSCAD_Language#.24fa.2C_.24fs_and_.24fn try reduce these and the openscad calculations get quicker.
Jaime Vives Piqueres
@jaimevives
The version in 14.04 is 2014.01.29, so seems a bit old. But the openscad gui works fine and loads the examples very fast.
Jakob Flierl
@koppi
hmm

$ time bash -c 'echo "cube([2,3,4]);" > /tmp/bpp.scad && openscad -o /tmp/bpp.stl /tmp/bpp.scad'

real 0m0.036s
user 0m0.016s
sys 0m0.004s

Jaime Vives Piqueres
@jaimevives
here:
real 0m0.176s
user 0m0.118s
sys 0m0.054s
Jakob Flierl
@koppi
$ openscad -v
OpenSCAD version 2015.03-1