On Thu, Jun 24, 2010 at 10:57 AM, Thomas Paviot <tpav...@gmail.com> wrote: > 2010/6/24 Thiago Franco Moraes <totonixs...@gmail.com> >> >> On Thu, Jun 24, 2010 at 10:27 AM, Thomas Paviot <tpav...@gmail.com> wrote: >> > Hi Thiago, >> > I also noticed a strong memory consumption and cpu usage with big STL >> > files >> > (1e6 faces is actually a *huge* number of faces). >> > The thing is : why do you want to load these STL files? If it is only >> > for >> > visualization, may be OCC/pythonOCC is not the best tool for that need >> > (you >> > talk about MeshLab, which I don't know). >> > Now, if you want to do 3D modeling over your STL file (like add a >> > chamfer on >> > an edge, drill a hole, slice the shape for manufacturing etc.) then you >> > *need* a 3D modeling library and pythonOCC can help you. But, in that >> > case, >> > the STL file needs to be mapped to the OCC internal data model >> > (TopoDS_Shapes, *Edges, Vertices*) and that's why the loading requires >> > so >> > much memory/cpu usage. So I don't know if you face a bug : OCC should be >> > compared to another modeling tool, and that's a benchmark I didn't make. >> > Best Regards, >> > Thomas >> >> Hi Thomas, >> >> I'm developing a open source medical software named InVesalius [1], >> from medical exams (CT, RMI) it generates STL to be used in 3D >> printers to print phisical models that doctors and odontologists can >> use to plan a surgery. Our software is developed using VTK [2]. Now >> our objective is to convert that STLs to STEP to use in CAD softwares. >> >> Thanks! >> >> [1] - http://svn.softwarepublico.gov.br/trac/invesalius >> [2] - http://www.vtk.org/ > > Conversion from CAD to STL, then STL to STEP and back to CAD is a strange > workflow. The STEP file generated from the STL mesh will be huge and any CAD > program will fail loading it (well, that's an assumption, didn't test). > Furthermore, the conversion from a mesh to a BRep geometry is still an open > issue. > According to me, a better way is to generate the STEP and STL files from the > same CAD program. VTK does not handle STEP files and, in a sense, it can be > easily understood : the "V" of VTK stands for "Visualization", whereas STEP > is rather related to modeling. I think that both OCC and VTK should be used > in a complete modeling/visualization application. The salome development > team (http://www.salome-platform.org) recently commited a code named > 'OCC2VTK'. It's not released yet, but it could be very interesting to have > both libraries interoperable. > Best Regards, > Thomas
Thanks Thomas, I'll take a look in OCC2VTK. I've just uploaded a STL file here http://ubuntuone.com/p/7uN/ , if someone wants to test. >> >> >> > 2010/6/24 Thiago Franco Moraes <totonixs...@gmail.com> >> >> >> >> Hi all, >> >> >> >> I've been trying to read STL files. With small STL files it reads >> >> normally. With not so big STL files (like the one I've just tried to >> >> read that have 51 MB, binary, 534678 vertices, 1069782 faces) it can't >> >> read, the CPU usage is about 100% and memory grows up from a few MB to >> >> 4 GB then I have to kill my script. Using Meshlab the memory usage is >> >> about 270 MB. I've tried to use STLImporter class and StlAPI class. >> >> Bellow the code I used: >> >> >> >> from OCC.Utils.DataExchange import STL >> >> reader = STL.STLImporter('file.stl') >> >> reader.ReadFile() >> >> >> >> Ah, I'm using the packages from Ubuntu 10.04 64 bits, the last version >> >> in PPA repository [1]. >> >> >> >> I have done something wrong on trying to read that file? Is it a bug? >> >> If necessary I can upload the STL in some place. >> >> >> >> Thanks! >> >> >> >> [1] - https://launchpad.net/~cae-team/+archive/ppa >> >> >> >> _______________________________________________ >> >> Pythonocc-users mailing list >> >> Pythonocc-users@gna.org >> >> https://mail.gna.org/listinfo/pythonocc-users >> > >> > >> > _______________________________________________ >> > Pythonocc-users mailing list >> > Pythonocc-users@gna.org >> > https://mail.gna.org/listinfo/pythonocc-users >> > >> > >> >> _______________________________________________ >> Pythonocc-users mailing list >> Pythonocc-users@gna.org >> https://mail.gna.org/listinfo/pythonocc-users > > > _______________________________________________ > Pythonocc-users mailing list > Pythonocc-users@gna.org > https://mail.gna.org/listinfo/pythonocc-users > > _______________________________________________ Pythonocc-users mailing list Pythonocc-users@gna.org https://mail.gna.org/listinfo/pythonocc-users
