The import export preference settings is for obj format. I got no problem when using obj. Importing and exporting obj meshes between RC and Zbrush is straight forward, I actually don’t need Blender if I’m using an obj mesh. BUT, as everyone knows, obj is 3x the filesize of an fbx and fbx is the most common file format that is being used in a pipeline and plus fbx supports camera export which is necessary for manual projection of photos outside RC. Those are the main reasons why I’m pushing the developers for a solution when using an fbx format.
The default import export settings on zbrush 2018 and 2019 should work fine.
The actual fbx import export settings can be found on the Plugins -> FBXExportImport, but for whatever reason it doesn’t work at all. Any options that I select gives the same result everytime.
Well, now that you’ve said it, I’m not sure on the up-axis of RC. Yeah it could be Z. I actually based the up-axis on the color of the gizmo - red, which is X axis on all 3d programs.