Update both part and assembly files as design changes take place with Update Model feature.stl, importing it in blender and then applying the smooth feature to avoid those mesh divisions. My usual way to do it is by creating a tesselation (polygon mesh creation) in CATIA, then exporting in. Directly open imported files and treat them like Base Parts, so you can freely make design modifications without affecting the native file. As I use CATIA V5 to model and Blender in Cycles to render I've been having some problems with de export-import process between these two softwares.
The CATIA V5-SOLIDWORKS Translator was replaced by 3D Interconnect, which provides direct integration of native CATIA files, 3D Interconnect was introduced with SOLIDWORKS Premium 2017 (Premium version only). To experience how easy it can be reading, viewing, editing, and writing CATIA files, sign up for a free trial and begin using all of Machine Research’s CATIA tools today (including, CATIA V5 viewer, CATIA V6 viewer, CATIA drawing viewer, catpart and more). This tool is also not available in SOLIDWORKS 2019 or newer. Open and view CATIA files on the flyeven on your mobile device.
The CATIA® V5-SOLIDWORKS Translator is no longer supported and can no longer be renewed.