CAD Export Topology issues

Jumbee

Hey,
When the cad model is exported from cad software(most likely autocad) as an stl file. i get the issues you can see in to photo. Especially with cylinder and around the bevels.
The Problem is:
                          -Uneven edge distribution
                          -extra edges in between edges.
                          -non quad topology
                          -spiralling edges
                          -weird triangulation(causing shading issue) etc.
     ?-I need this model render ready. Is there way to fix this while exporting out from the cad software?
     ?-Is there a way to fix the model with least amount of effort and time?
     ?-What is the problem?

Eric Chadwick

Problems like these are just inherent in CAD data which is typically not set up for tessellation. 

You can try different software to tessellate these parametric surfaces. Or you can use retopology tools to make a wholly-new topo. 3ds Max has really nice retopo tools, works really well with hardsurface models too.

sacboi

Indeed +1

As an example my choice of DCC app, typically you'd use something like a quad remesher operation then manually edit remaining surface artifacts but rapid conversion is fairly dependent on the object's complexity, as well.  

Parametric vs Polygonal paradigm i.e. pros and cons

Noren

"I need this model render ready. Is there way to fix this while exporting out from the cad software?"

If you are able to get exports in a format that supports explicit vertex normals, e.g. fbx if the CAD software or converter can write the normals correctly, there's a chance minor inconsistencies like that won't show up in your renders (assuming the explicit normals are imported and interpreted correctly as well). The downside is that any changes to the geometry down the line are very likely to break the explicit normals.