ZBrushCentral

Rescaling

ZBrush Usage Questions
#1

Sorry its long, but I need a clue and its complicated. So I’m building a head and neck medical model with great surgical detail of sinuses, inner ear, eyes. Animated in Max with Vray, painted in Zbrush polypaint, and original models for parts comes from CT scans and programs that can pick out parts and export as stl.

The CT scans are integral in the model in Max using opacity maps and ray tracing and Booleans to make some interesting vomlumetric looking perspectives, so it all has to be spatially accurate with the scans.

When I imported the STL into Zbrush, I didn’t expect it to transfer to max without some scale and orientation issues so I put reference objects.

I end up Resizing up the model by 20x or something, repositioning to match reference marks and there it transfers with Max correctly., then work on it in that position and size.

My question is since I cant have things changing location or size at all and before I put more time in them, is there some function like “reset xform” or center pivot or some more stable arrangement or freeze or some other maintenance move that will prevent problems from the transform? And the geometry > size slider goes to 100 as soon as you scale subtools up some and it wont go higher and just stays maxed out, so that seems strange for one thing. Models that I started in Max and send over, of the new same size have a size of 2 or so in the geometry > size. Ive had screwy scale things going on that I’ve fixed but cant always explain with these zGo, import, export mish mash. Thanks for any clues.

#2

Ok, played around all night and found several solutions and slowly understanding the weird way zbrush scales. Anyway, I took the tool that was of correct orientation and size and had a geometry > size around 2 is correctly matched with max in both GoZ and .obj transfers, multi appended the tool that was of the correct orientation and size but had a geometry > size of over 100 or whatever… And that fixed it so that the geometry > size was in a good range and still works with max in and out. That transfer also changes the export scale and offset values from 1,0,0 to other values, as expected.

super un intuitive that it can be different sizes in the geometry > size slider but be the same size for import export goz until you look at the export scale values, and that the size slider in geometry > size tops out at 100 even if you keep resizing something up using action line. There must be some internal value that simply isnt reflected in that slider.