Hi Antonio,
> Is IGES better than STEP for this kind of conversion?
Unfortunately there isn't really a single format that is always better than the others in all circumstances, sometimes in one particular case one format may be better and then in a different case another one may be better.
Each format does things a little differently.
The main problem with IGES is usually that only individual surfaces are stored in the IGES file and then the receiving application needs to take all those individual surfaces and figure out how to join them to one another to make a solid which can sometimes be a complex process.
In STEP, the objects are stored as solids (the connections between surfaces are stored and do not need to be calculated manually), but STEP has a different issue where only the 3D edge curves are used for trimming boundaries, forcing the application to calculate the UV space curves of each trimming boundary from the 3D edges. With complex edge structures (especially when edges are nearby a surface seam), that can be a complex process.
Any complex process can tend to cause problems, the more complex a process is the more possibility for things to go wrong.
Anyway, it sounds like you have resolved your issue using the original model?
- Michael
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