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Must have software for STEP/BREP topology debugging.

stepalibre

stepalibre

Alibre Super User
Best toolset for all things STEP and topology debugging:

Analysis Situs

Analysis Situs
quaoar.su quaoar.su

Analysis Situs

Приложение для инспекции CAD-моделей и прототипирования алгоритмов геометрического моделирования.
quaoar.su quaoar.su

Analysis Situs: features

analysissitus.org analysissitus.org

gitlab.com

Quaoar / AnalysisSitus · GitLab

Open source CAD platform.
gitlab.com gitlab.com


www.nist.gov

STEP File Analyzer and Viewer

The free STEP File Viewer supports parts, assemblies, dimensions, tolerances, and more.
www.nist.gov www.nist.gov

github.com

GitHub - usnistgov/SFA: The NIST STEP File Analyzer and Viewer (SFA) generates a spreadsheet and a visualization from an ISO 10303 Part 21 STEP file.

The NIST STEP File Analyzer and Viewer (SFA) generates a spreadsheet and a visualization from an ISO 10303 Part 21 STEP file. - usnistgov/SFA
github.com github.com

Gmsh: a three-dimensional finite element mesh generator with built-in pre- and post-processing facilities

gmsh.info gmsh.info

CAD Builder | Open CASCADE Technology

CAD Builder is a freeware parametric CAD modeler. It is a generic tool for parametric modeling derived from the SHAPER Module of the SALOME Simulation Platform developed by Open Cascade in collaboration with CEA and EDF. CAD Builder is designed for both professionals (engineers, architects...
dev.opencascade.org dev.opencascade.org

SALOME PLATFORM - The open-source platform for numerical simulation

www.salome-platform.org www.salome-platform.org

CAD Assistant | Open CASCADE Technology

CAD Assistant is a freeware viewer and converter for 3D CAD and mesh files, developed by Open Cascade. CAD Assistant is based on open source libraries (Open CASCADE Technology, Qt, FreeType, FreeImage, etc.) and employs open formats for CAD and mesh data (STEP, IFC, IGES, BREP, glTF, JT, PLY...
dev.opencascade.org dev.opencascade.org

I'm sharing what I use since STEP is a frequently discussed format.
 
Last edited:
stepalibre

stepalibre

Alibre Super User
S

SergioP.

Member
FreeCAD? I was able to defeature fillets/chamfers/holes razonably well with FreeCAD, and also deleting wrong faces and recreating a patch using curves and edges to make it a valid solid again. It complements very well for users like me that I have only Alibre Atom3d
 
stepalibre

stepalibre

Alibre Super User
Yep. Opencascade based apps and libs:

Gmsh: a three-dimensional finite element mesh generator with built-in pre- and post-processing facilities

gmsh.info gmsh.info

CAD Builder | Open CASCADE Technology

CAD Builder is a freeware parametric CAD modeler. It is a generic tool for parametric modeling derived from the SHAPER Module of the SALOME Simulation Platform developed by Open Cascade in collaboration with CEA and EDF. CAD Builder is designed for both professionals (engineers, architects...
dev.opencascade.org dev.opencascade.org

SALOME PLATFORM - The open-source platform for numerical simulation

www.salome-platform.org www.salome-platform.org
 
S

SergioP.

Member
Did you solve bad setp geometries with Analysis Situs, or just to figure out where are the wrongs parts of the models?
 
stepalibre

stepalibre

Alibre Super User
Analysis Situs is based on Opencascade. It's hard to answer that. I use it to understand topology so I can automate reconstruction. Understand the structure and what changes will affect the topology. The features are vast with scripting and many new features recently.
1713453314367.png

Step file issues I see are:
- translator related
- poor design intent resulting in bad topology
- tricking geomerty conditions
 
stepalibre

stepalibre

Alibre Super User
CAD modeling decisions reflect the resulting topology. Debugging help in understanding how to model or why something is not working in the CAD system or tool.
1713457021217.png
 
stepalibre

stepalibre

Alibre Super User
SergioP. said:
Never use that feature.
Click to expand...
CAD Builder has the dump feature, my mistake.

STEP format supported, viewer:

CAD Assistant | Open CASCADE Technology

CAD Assistant is a freeware viewer and converter for 3D CAD and mesh files, developed by Open Cascade. CAD Assistant is based on open source libraries (Open CASCADE Technology, Qt, FreeType, FreeImage, etc.) and employs open formats for CAD and mesh data (STEP, IFC, IGES, BREP, glTF, JT, PLY...
dev.opencascade.org dev.opencascade.org
 
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