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OCC's surface-to-surface intersection algorithm seems a bit slow. I'm planning to work on speeding up the surface-to-surface intersection calculations. I was wondering if anyone has any suggestions. The main focus will be on cases where two NURBS surfaces intersect. o_O

Today I encountered a very strange situation that confuses me whether it is a flaw in OCCT or an issue with my usage. Next, I will do my best to describe this situation clearly and provide a demo. It starts like this: I have a TopoDS_Face `face_origin`, and I intend to generate a wire using...

Hi Bros, I'm JianBaoXia.;) As title, I attempted to use BRepBndLib::AddOBB() to generate an OBB for four points that are not coplanar, but the results were confusing. Am I using it incorrectly? There is my demo: bool WriteStepFile(const TopoDS_Shape& shape, const std::string& filepath) {...

Hello everyone, I'm JianBaoXia. Today I attempted to triangulate a B-spline surface, but the results were not satisfactory. The outcome is shown in the image below: It is evident that triangulation seems to fail in regions with high curvature. I am unsure if this is a limitation of the OCCT...

Hello, I‘m JianBaoxia. I'm trying to find the lowest point (the point with the minimum z-coordinate) on a surface. It seems that directly traversing all (u, v) coordinates uniformly may not guarantee accuracy and efficiency. So, I'm attempting to use the gradient descent algorithm to find...

I recently read some articles about constructing BVH and can't wait to implement it myself. In lesson 17 on Quoar, I found the code for constructing BVH and calculating the intersection points of rays and triangles using the BVH_PrimitiveSet class in OCCT. This is exactly the code I want to...

Hi Bro, I'm JianBaoxia. I ran into a problem while compiling, but actually I had successfully compiled the OCCT environment following Quaoar's lessons 0, 1, and 5, and learned how to configure the relevant header files and libraries, which allowed me to successfully get started with OCCT...

Hi Bros, I'm JianBaoxia. Today, while using Handle(Geom_Curve)->value() to obtain some points on a B-spline curve, I encountered some strange phenomena. Therefore, I couldn't wait to discuss and share with you. To illustrate the problem, I wrote a simple demo, which is as follows: I read...

Hi Bros, I'm jianbaoxia. Today, I get a plane, and it's bound is a bspline curve, I try to fill the plane with tool path. So I try to offset the bound edge, and I write a demo to fill a plane with BRepOffsetAPI_MakeOffset , it works, as show: However, the same way doesn't work for bspline...

Hi Bros, I'm JianBaoxia. I get a .step file, it's a wire and consist of several TopoDS_Edges. First I try to sort the edges, and build it as a wire. o_O I use "ShapeAnalysis_WireOrder", and it failed and give the status"some edges are reversed, but no gaps remain". Then I try another way to get...

Hi Bros, I'm JianBaoxia. Today I get a wire, and try to transform the wire to be a bspline curve. First I call to mind is "GeomAPI_PointsToBSpline (const TColgp_Array1OfPnt &Points, const Standard_Integer DegMin=3, const Standard_Integer DegMax=8, const GeomAbs_Shape Continuity=GeomAbs_C2...

Hi Bros, I'm JianBaoxia. After I finally the wire build with you help yestoday, I keep try to use it to build a TopoDS_Face, however, there seems get something wrong without error raise. I get a TopoDS_Face from file "cylFaceForCut.step"(Fig 1), and get TopoDS_Wire from file "wire.step"(Fig 2)...

Hi Bros, I'm JianBaoxia. I try to connect some edges to become a closed wire today. I use "ShapeAnalysis_WireOrder" to sort the edges, and some edges should be reversed. The edges are "TopoDS_Edge", so I use the TopoDS_Edge.Reversed(). However, it seems something beyond my expection. The...

Hi Bros! I try to extend some faces, as show blow: I try to extend all the gray faces to the green face, in CAD sofeware, it's a commonly used function, however, I have no idea how to do it through OCCT. May be GeomLib :: ExtendSurfByLength() can work, I try to use it now. Can I get suggestions...

Hi Bros, I'm JianBaoXia, Today I try to sweep a profile(actually a line) along two path(actually two BSplin curve), this type face is common in industry. I can use BRepPrimAPI_MakePrism to sweep along a path easy in OCCT, however, it seems hard to see the use of sweep along two path.

Hi Bros, I'm JianBaoXia. Today I try to check whether a point on a face. I use the BRepClass_FaceClassifier.State() first, and faild. Then I try to compute the short distance between point and face, and check if the distance shorter than the tolerance. It seem I make it success. However, I...

Hi Bros, I'm JianBapXia. Today I use a set of points and to create a constrained BSpline curve through GeomAPI_Interpolate. The points look likes below: I get two problems. 1、The curve I create didn't pass the first point, as show: 2、The end point is point_21, however, the path between...

Hi Bros, I'm JianBaoXia. Today I write a demo of create a helix edge, I do it both in Draw and BRepBuilderAPI_MakeEdge. However, the helix create in helix is smooth, and another helix create by my code is not, look likes below: I'm looking the code of tcl, I must ignore something. However, I...

Hi Bros, I'm JianBaoXia. I get a BSpline curve, and two point on it. I want to trim the curve and get the segment of the curve between the two points. I try to do it through Geom_TrimmedCurve, however, it needs convert the two points to parameter values U1 and U2. In surface I know xyz can...

Hi Bros, I'm JianBaoxia. I get a BSPline surface, and points on the face, I want to get the curve between two points on the face. I look for answer several days, but didn't success. It's my honor to get your help. The curves I want look like below: