![]() ![]() The topological naming problem most often affects and confuses new users of FreeCAD. Forum thread: Topological Naming, My Take.As of FreeCAD 0.19 there are ongoing efforts to improve the core handling of shapes in order to reduce or eliminate such issues. ![]() The topological naming issue is a complex problem in CAD modelling that stems from the way the internal FreeCAD routines handle updates of the geometrical shapes created with the OCCT kernel. In TechDraw, if a dimension is measuring the length of a projected edge, the dimension may break if the 3D model is changed, as the vertices may be renamed thus changing the measured edge.In PartDesign, if a feature is supported on a face (or edge or vertex), the feature may break if the underlying solid changes size or orientation, as the original face (or edge or vertex) may be internally renamed.This issue affects all objects in FreeCAD but is especially notable when building solids with the PartDesign Workbench, and when dimensioning those solids with the TechDraw Workbench. This will result in other parametric features that depend on that shape to break or be incorrectly computed. The topological naming problem in FreeCAD refers to the issue of a shape changing its internal name after a modelling operation (pad, cut, union, chamfer, fillet, etc.) is performed. ![]()
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