Hi Dave,
Good to hear your making progress.
We've noticed that the .Delete method does absolutely nothing in some cases.
What happens if you call .Destroy rather than .Delete ?
Currently we're working on overloading __del__ such that this type of
thing can be done in slightly more pythonic syntax.
Cheers,
-jelle
On Wed, May 13, 2009 at 3:52 AM, Dave Cowden <dave.cow...@gmail.com> wrote:
> Hello, everyone!
>
> I have a slicing program up and running!
>
> Unfortunately, when I try to do large numbers of slices or larger objects,
> my memory usage continually rises.
>
> Initially I had visions of keeping a copy of the faces created by the slices
> for better visualization, but re-worked my code to collapse everything (
> optionally ) into simple strings so I can free the OCC objects.
>
> But alas, I cannot figure out how to release the memory.
>
> Here is my code. My slicing approach is different than the slicer you guys
> implemented-- I am using BRepAlgoAPI_Cut so that my result is a face with
> the edges and wires organized. BRepAlgo_Section is faster, but then I dont
> have a face, and I was unable to figure out how to use
> ShapeAnalysis:WireOrder to get the wires organized.
>
> _anyway_ here is my slice code. the code in the #free memory section doesnt
> seem to have had any effect.
>
> Does anyone know how I should be freeing memory for the occ objects?
>
> thanks in advance, code follows
>
> dave
>
>
> def _makeSlice(self,shapeToSlice,zLevel,curveTolerance=0.001):
> s = Slice();
>
> #change if layers are variable thickness
> s.sliceHeight = self.sliceHeight;
> s.zLevel = zLevel;
> #make a cutting plane
> p = gp.gp_Pnt ( 0,0,zLevel );
>
> origin = gp.gp_Pnt(0,0,zLevel-1);
> csys = gp.gp_Ax3(p,gp.gp().DZ())
> cuttingPlane = gp.gp_Pln(csys);
> bff = BRepBuilderAPI.BRepBuilderAPI_MakeFace(cuttingPlane);
> face = bff.Face();
>
> #odd, a halfspace is faster than a box?
> hs = BRepPrimAPI.BRepPrimAPI_MakeHalfSpace(face,origin);
> hs.Build();
> halfspace = hs.Solid();
>
> #bounds = getBoundingBox(shapeToSlice);
> #c1 = gp.gp_Pnt( bounds[0], bounds[1],bounds[2] ); #lower left corner
> #c2 = gp.gp_Pnt( bounds[3], bounds[4], zLevel ); #upper right corner
> #bs = BRepPrimAPI.BRepPrimAPI_MakeBox(c1,c2);
> #bs.Build();
> #halfspace = bs.Solid();
>
> #make the cut
> bc = BRepAlgoAPI.BRepAlgoAPI_Cut(shapeToSlice,halfspace);
> bc.Build();
> cutShape = bc.Shape();
> #search the shape for faces at the specified zlevel
> texp = TopExp.TopExp_Explorer();
> texp.Init(cutShape,TopAbs.TopAbs_FACE);
> foundFace = False;
> while ( texp.More() ):
> face = ts.Face(texp.Current());
> #logging.debug("Checking Face for zLevel " + str(zLevel));
> if isAtZLevel(zLevel,face):
> foundFace = True;
> logging.debug( "Face is at zlevel" + str(zLevel) );
> s.addFace(face);
> texp.Next();
>
> #free memory
> hs.Delete();
> halfspace.Nullify();
> cutShape.Nullify();
> bc.Delete();
> texp.Destroy();
>
> if not foundFace:
> logging.warn("No faces found after slicing at zLevel " + str(zLevel) + "
> !. Skipping This layer completely");
> return None;
> else:
> return s;
>
> _______________________________________________
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> Pythonocc-users@gna.org
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>
>
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