Use advanced sculpting and retopology tools not available in ZModeler.
That’s the quiet magic of a converter. Not the code, not the speed — but the second life it grants to a shape that was nearly erased by time.
The most reliable way to convert Z3D to OBJ is by using the software that created it. This ensures that the geometry and hierarchies are preserved correctly. Steps to Export from ZModeler:
Symptoms: The mesh looks transparent or black, and you can see through the object from the outside.