Hi István Great work! This was very helpful!
Thank you! Lie Pablo On 4 September 2011 12:37, István Csanády <istvancsan...@gmail.com> wrote: > Hi Lie, > > Here is how I create vertex and normal buffers for OpenGL, hope it is > helpful. > > > def mesh_shape(self,shape): > > if shape.IsNull(): > > return > > > > BRepMesh_Mesh(shape,0.01) > > t = Topo(shape) > > numTriangles = 0 > > triangulations = [] > > faces = [] > > for aFace in t.faces(): > > loc = TopLoc_Location() > > triangulation = BRep_Tool_Triangulation(aFace,loc) > > faces.append(aFace) > > if triangulation.IsNull() == False: > > numTriangles += triangulation.GetObject().NbTriangles() > > triangulations.append(triangulation) > > > > normals = [0.]*numTriangles*3*3 > > triangles = [0.]*numTriangles*3*3 > > > > t = Topo(shape) > > index = 0 > > for i in range(len(triangulations)): > > triangulation = triangulations[i] > > tris = triangulation.GetObject().Triangles() > > nodes = triangulation.GetObject().Nodes() > > prop = BRepGProp_Face(faces[i]) > > for j in range(1,triangulation.GetObject().NbTriangles()+1): > > > > N1 = None > > N2 = None > > N3 = None > > #Poly_Triangle > > N1,N2,N3 = tris.Value(j).Get() > > V1 = nodes.Value(N1) > > V2 = nodes.Value(N2) > > V3 = nodes.Value(N3) > > triangles[index*9] = V1.X(); > > triangles[index*9+1] = V1.Y(); > > triangles[index*9+2] = V1.Z(); > > triangles[index*9+3] = V2.X(); > > triangles[index*9+4] = V2.Y(); > > triangles[index*9+5] = V2.Z(); > > triangles[index*9+6] = V3.X(); > > triangles[index*9+7] = V3.Y(); > > triangles[index*9+8] = V3.Z(); > > > > uv = triangulation.GetObject().UVNodes().Value(N1); > > tmp = gp_Pnt() > > norm = gp_Vec() > > prop.Normal(uv.X(),uv.Y(),tmp,norm); > > norm.Normalize(); > > normals[index*9]=norm.X(); > > normals[index*9+1]=norm.Y(); > > normals[index*9+2]=norm.Z(); > > > > norm.Normalize(); > > normals[index*9+3]=norm.X(); > > normals[index*9+4]=norm.Y(); > > normals[index*9+5]=norm.Z(); > > > > uv = triangulation.GetObject().UVNodes().Value(N3) > > prop.Normal(uv.X(),uv.Y(),tmp,norm) > > norm.Normalize() > > normals[index*9+6]=norm.X() > > normals[index*9+7]=norm.Y() > > normals[index*9+8]=norm.Z() > > index = index+1 > > > On Sat, Sep 3, 2011 at 9:30 PM, Lie Pablo <lie...@gmail.com> wrote: > >> István Csanády <istvancsanady@...> writes: >> >> > >> > >> > Hi All! >> > >> > If I give an topological incorrect shape to QuickTriangleMesh, it >> crashes if I >> call compute() (And it does not crash if I call >> compute_default_precision() but >> does not return any data). However the SimpleGUI can display it. Is it >> possible >> somehow to use the SimpleGUI's mesher algorithm (and curve discretizer)? >> I've >> attached the code. (Mac OSX 10.6, python 2.6) >> > >> > István >> > >> > Attachment (main.py): application/octet-stream, 5132 bytes >> >> >> Hi István, >> >> I'm working with QuickTriangleMesh and I found another problem... I get >> about >> half of the normals flipped. But if I save it straight away with >> StlAPI_Writer >> the normals are ok. >> >> All best >> Lie Pablo >> >> >> _______________________________________________ >> 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 > >
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