Forum archive
Technical discussions preserved from the public OCCT community forum.
Discussions
Showing 60 discussions, ordered by the latest archived activity.
Hi all, I am using the lastest version of pythonocc-core. I just want to extract the name of shape / label and print it out: # Get all labels containing shapes labels = TDF_LabelSequence() shape_tool.GetFreeShapes(labels) # Iterate through all labels and print their names for i in range(labels.Lengt
problem I'm trying to modify the transform of sub assembly to its parent level using XCAFDoc_Location::Set() method. The problem is when I export the model to step and read it again, I find the location doesn't change. I have tried to solve is, using shape_tool->UpdateAssemblies() or doc->Recompute(
I'm working on a system that should take a user uploaded STEP file and return the BREP representation. When I read the file using ReadStepFile, the output object seems to only have a mesh array, and a brep_faces array that just shows hashes, not actual BREP data. Is there a way to get the raw brep d
hello, there is a crash in finding extremas of two co-central arc edges: edge1: start point: 0,8,0 end point: -8,0,0 centre: 0,0,0 axis dir: 0,0,1 edge2: start point: 0,4,0 end point: -4,0,0 centre: 0,0,0 axis dir: 0,0,1 //--------------------------------------- double d_tmin1, d_tmax1; double d_tmi
Hi, How can I find the tangent of a 3d curve at a point? Like this http://upload.wikimedia.org/wikipedia/commons/2/2d/Bezier_2_big.gif GeomAPI_Interpolate seems promising thanks
Hello, I know how to get the Poly_Triangulation from a given TopoDS_Shape ; but is it possible to do the inverse : build a TopoDS_Shape from a given Poly_Triangulation ? Thank in advance Bruno
Hi everyone, I am currently facing an issue when trying to pick a cylindrical face from a CAD model using OpenCascade. I am using the following call: m_aisContext->MoveTo(point.x, point.y, m_v3dView, false, true); This leads into: AIS_StatusOfDetection AIS_InteractiveContext::MoveTo( const Standard_
AIS_InteractiveContext::SelectRectangle(_min, _max, _view, AIS_SelectionScheme_Replace) I try to rect select on X-Y plain using SelectRectangle, _min and _max are converted from World location. I cannot select object whose Bnd_Box has negative coordinates along the Z-axis. For example object boundin
I have the following C++ code. It generates with three of the four side faces and no top or bottom. Any thoughts on what is wrong here? TopoDS_Shape MakeShape(); int main() { const char * filename = "/home/mwu/src/occtest_native/build/myshape.stl"; TopoDS_Shape shape = MakeShape(); StlAPI_Writer stl
Hi I am very new to OCCT. I am currently busy with an online coarse to give the basic background on OCCT. I want to create a simple CAM program that will load a STEP file and do the following work. 1) Load the STEP model. This will be a hollow cylinder or pipe. The pipe has some holes at any entry a
I am using opencascade.js and trying to build a solid out of a shell. I am trying to detect problems in the shell by running the analyzer. However, when I try to iterate over BRepCheck_ListOfStatus, I see a crash on line const it = statusList.begin(); statusList has a size of 1. Please suggest a sol
Hi all, it seems that method math_Matrix::Multiply(const math_Matrix& Right) is wrong. In the following code, when I = 0, J2 = 0, the code "Array(I, J2) = Som;" sets Array(0, 0) to Som, but then Array(0,0) is reused to compute the final elements in position Array(0,1), Array(0,2), ... Array(0,Right.
Dear all, We develop 3D modeler that allows to hollow one shape by several shapes. The shapes are designed thanks to BRepPrimAPI (box, cylinder, sphere,...) and the cut performed thanks to BRepAlgoAPI_Cut We encounter sometimes some issue during the cut operation, the resulting shape does not match
Hi, 1.I use follow code to get the end points of edge, // gp_Pnt startPnt1 = BRep_Tool::Pnt(TopExp::FirstVertex(edge, Standard_True)); gp_Pnt endPnt1 = BRep_Tool::Pnt(TopExp::LastVertex (edge, Standard_True)); The result is, startPnt1: {x=99.074021934389805 y=53.997534062546201 z=-45.442753877454102
The above classes behave differently when computing a minimum distance between a vertex and a face. BRepExtrema_DistShapeShape always finds at least one closes point. However, BRepExtrema_ExtFP reports no solutions in some cases. From online documentation is not clear what is the expected behavior o
Hello! I'm having trouble with OCC version 7.8 with reading STEP files, specifically with reading folder paths with Japanese characters in them. For example if I have the following C++ code snippet: CString file = "C:\Users\jgregory\Desktop\新しいフォルダー\stepfile.stp" Standard_CString FileName = (Standar
Hi, I got this conversor set up from IGS to OBJ. It works fine for the conversion, but I'm having trouble getting acces to a few sketch lines from the IGS. I know that Faces are shapeType 4 as TopAbs_FACE but I dont know which one is for the sketch lines. Debugging I've seen its index 0 so I'm assum
Hello, I'm contributing to the FreeCAD project and I came across a strange behavior with BRepOffsetAPI_MakePipeShell . It seems that in some circumstances the created pipe (using the BRepOffsetAPI_MakePipeShell API) is twisted. As shown below in the image twisted.png , the pipe appears to be self in
Hello, my configuration like this: Ubuntu 24.04 OCC 7.8.1 QT 6.4.2 I have a QWindow which contains a QTabWidget, and this TabWidget has two children widgets First tab simply associates with a QPushButton Second tab associates with an OccQtViewer which is inherited from QOpenGLWidget, and contains al
Hello,I have an occ view embedded in a qt app with configuation like this: Ubuntu 24.04 OCC 7.8.1 QT 6.4.2 and it works fine under Windows like attached picture:works fine under windows.png, but under ubuntu, all QT UI got messed up like attached pictures: messed_up_under_ubuntu.png; and at the same
Hi, want to start the development of a .NET micro server that creates parametric geometries on demand, using Open CASCADE. So one question first: is it possible to run the Open CASCADE libraries in multiple instances, as required for such a micro service? Thx ia, Ekki
Hello, I have been struggling with a problem for a while regarding retaining relationship between a TopoDS_Shape and its corresponding TopoDS_Edge's, after I have extracted the edges from the shape through explore. If I convert the shape and the edges to BREP's and then convert them back to Shape an
It was December 7, 1999, 25 years ago when Matra Datavision released OpenCASCADE in source code. A move that required vision, leap of faith and political will of those who were in charge. I am thankful for being part of this story, before, during and after that moment. This product triggered my prof
Hello everyone, I am encountering a problem where my application becomes unresponsive when using a popup with an `OCCTQtViewer` widget. Here's how to reproduce the issue: 1. On the main page, there is a button that opens a subpage. 2. On the subpage, there is another button that opens a popup contai
Hello everyone, I am encountering a problem where my application becomes unresponsive when using a popup with an `OCCTQtViewer` widget. Here's how to reproduce the issue: 1. On the main page, there is a button that opens a subpage. 2. On the subpage, there is another button that opens a popup contai
For example, I have 10 TopoDS_Faces and 100 Geom_Curve, and I need to calculate the intersection of each face and each line, 10*100=1000 times, which will take a lot of time. So I expect multiple threads to compute the intersection of each surface and curve in parallel. However, the actual calculati
Hello everyone, i've got few questions about implementing application. Using Qt and OpenCASCADE. I've found out there is class TDocStd_Application , should i use it to control every process in my app or i should use inherited classes(if yes, which one)? Because i checked source code of FreeCAD , the
I have some STEP files in which all cylindrical faces are split into two and I tried ShapeUpgrade_UnifySameDomain to merge them, most of these files were processed successfully but some failed. Here is the error info:Standard_ConstructionErrorgp_Dir::Crossed() - result vector has zero norm raised fr
Hello, I noticed that the class documentation website does not work. e.g.: https://dev.opencascade.org/doc/refman/html/classgp___ax3.html gives a 404 not found. Could you look into this? Thanks, Author
Hello, I'm trying to get the silhouette or outline of a solid when looked at from above. The image tries to illustrate this. I've looked into HRL_Algo and HLRBRep_HLRToShape but no filter grabs just the silhouette of the shape (including HLRBRep_HLRToShape::OutLineVCompound). I've tried some other s
I have tried many different methods of creating a shell-based B-Rep consisting of faces bounded by polylines with endpoints already on the surface. The only thing I need to do, I think, is define curve geometry that adheres to the surface, and provide it to `BRepBuilderAPI_MakeEdge(curve, start_pt,
How does one call BRepOffsetAPI_ThruSections with a set of TopoDS_Face that are simple shapes, but with holes in them? My code works well running BRepOffsetAPI_ThruSections twice, with the outside shapes first, and then the inside shapes later and boolean the two together. But I want to test is runn
I built it based on OCCProxy When I successfully build and run a NET/C++hybrid programming project (refer to the tutorial for. NET: Import/Export (C # | C++/CLI | WinForms | WPF)), all other behaviors of the program are normal, but I cannot view the values of OCCProxy's variables (including local an
I have a big problem in my master thesis project unsing OpenCascade: I don't know hot to calculate the attribute of a edge (convex or concave). This is the definiton of my problem: Input: Two neighbor faces (they share a common edge) Output: Are convex or concave? In OpenCascade it is easy to make s
Hello guys! I want to build a surface through a couple of guide curves (green ones in picture) and section curves (red ones in picture). For those who are fimiliar with CATIA, there it is called Multi-sections surface. I looked through the BRepOffsetAPI package, but didn't find a class which satisfi
Hi, I need to count the holes from a 3D mode. For now, I've tried counting inner wires for each face using "TopExp_Explorer explorer(shape, TopAbs_WIRE);", but I need more than this because sometimes 2 holes form a tunnel. In this case I'd need to avoid double counting inner wires. How would I check
Hi all: I am trying to split 1 edge of a solid box and somehow have the shapes updated so that I end up with a new box that has 13 edges instead of 12. I have included the code which basically shows how I am using BRepTools_Reshape. The sub-shapes are not updated correctly. What am I missing? I am d
Hi In response to your customer service, I sent an email on May 20, 2024 to request a demo of the C# wrapper tool to understand how to use it. I received no response from your customer service, could you address this request ? Regards
Hello, is there a way to recompute the tolerances of a shape and its subshapes, without doing a compleate repairing? I need an algorithm which sets the tolerances of vertexes and edges to as small a value as is enough to cover the gaps. My problem is the following. I often have faces or solids which
Hi Everybody! Where can i find some information on Shape Attributes? The doc in Application Framework User $ Guide is not enought clear for me... Is there an exemple somewhere? Here a description on what i want to do: Suppose a have three solid shapes.The third one is the intersection of the others:
Hi, I would like to get in touch with the commercial side of opencascade. I contact them via email, via the contact us formulary and other forms in their website, but I did not have any answer. Does anyone know how I can get in touch with them? I would like to have more information about OCCT traini
hello, is there a way how to disable shape fixing in step file reader? best regards, Author
hello all, I'm having a problem with BRepFilletAPI_MakeFillet.I have a Data for Real Case bug5495.zip in Files.Real Case is a Step. I want to select the highlighted edge as shown in the image bug5495-1.png and round the corner with a radius of 10. So far the rounded corners I get are shown in the fi
Hello, please we would like to know which are the exact FixShape flags used in CAD Assistant. https://dev.opencascade.org/doc/occt-7.6.0/overview/html/occt_user_guide... Turns out we are trying to match the same import behavior and we expect to be able to know this information. Please, let us know t
Hello guys, I want to export a Model to a STEP file. The model is consisted of several TopoDS_Shapes. How can I combine these shapes into one shape so that the STEP file opened as one model, not as many pieces? Waiting for your answer...
Disclaimer: I have never worked with OCC before and want to asses if what I want to do can be done with OCC. I am not asking for someone to do the work for me ;) I am working with an in-house Finite Element code, written in Fortran (with existing interfaces to other C/C++ libs). I am looking for a t
Attached you can find two STEP files exported from the same SolidWorks model. example_split-periodical-surfaces.STEP is exported with the option “Split periodical surfaces” set. example_nosplit-periodical-surfaces.STEP is exported with the option “Split periodical surfaces” unset. The option makes a
Dear friends! I create the New C++/CLI project which reference the OCCTProxy.dll( NCollection_Haft variables are there) and export the file names TEST.dll, and I want to use the NCollection_Haft variables(e.g "NCollection_Haft<Handle(AIS_InteractiveContext)> myAISContext;") in the TEST.dll. When I b
I use the occ to do the intersection operation, but it fails. I also test it using FreeCAD, and it fails, too. Would anyone help me? The attachment is the two parts. Archived image: external image
Dear Users and Developers, With the advent and success of LLM's like ChatGPT, BARD and numerous others it is now also possible to model 3D parts with these systems and OCCT, without using a classical CAD system. See my article here for a first intro: https://www.hackster.io/trisolarian/design-any-pa
hello all, I'm having a problem with BRepOffsetAPI_MakeOffset. Any ideas why this is crashing : TopoDS_Wire *s2; s2 = TopoDS::Wire(GetShape("Contour",ic)); BRepOffsetAPI_MakeOffset mkOffset(*s2) mkOffset.Perform(dist); GetShape returns a TopoDS_Shape (a wire) , dist is a real (0.001) an ic is an int
Suppose I want to achieve a spray effect, given a surface, and I want to change the color of a small part of the surface, how do I do that？
When I compiled the code into WASM, I found a significant performance degradation. This is five times less than native c++ code. I suspect there are several reasons: 1. Webassembly VM 2. Multithreading doesn't work 3. Virtual file system ? Any suggestions for improving performance?
Hello, i have converted my project to OCC 6.7.1. It has worked well with OCC 6.5.5 Now i have a crash if my program is closed. Here is the Call Stack: > TKDraw.dll!Tcl_ExternalToUtfDString(Tcl_Encoding_ * encoding, const char * src, int srcLen, Tcl_DString * dstPtr) Line 1128 + 0xd bytes C TKDraw.dl
Hi all When ever I compile any sample programme the following error occurs, fatal error C1083: Cannot open include file: 'Standard_ShortReal.hxx': No such file or directory Error executing cl.exe. Please help me removing this error. Siddhartha
Hi I have a 1 x 1 x 1 box and would like to build a fillet with radius=1.0 on one edge. I use BRepFilletAPI_MakeFillet and it returns IsDone()=0. Any suggestions? Thanks. Sean
I would like to create fillets that are "eating" the involved face(s). See my basic test on Draw # make prism polyline f 0 0 0 100 0 0 100 100 0 0 100 0 0 0 0 mkplane f f prism p f 0 0 200 # make fillets explode p e blend b1 p 50 p_1 50 p_8 I noticed that I can fillet up to 49.9999... Is there a way
Hello, I'm reading the shapes information from a stp file and I'm trying to find the "part number" (or "product number", the identification code of a part or an assemlby) but the part/product name is what i get (the nomenclature string). I can see that if the .stp file contain, for a given product,
Hello, I want to convert a TopoDS_Shape into a TopoDS_Edge. So I use the following instructions : Handle (TopoDS_TEdge) newEdge= Handle (TopoDS_TEdge) :: DownCast (oldShape); or Handle (PTopoDS_TEdge) newEdge= Handle (PTopoDS_TEdge) :: DownCast (oldShape); or Handle (PTopoDS_TEdge1) newEdge= Handle