ZBrushCentral

(Solved) How to deactivate AC (Auto Crop)?

ZBrush Usage Questions
#1

If I append a very large object to my subtool it changes my camera perspective. I think it’s due to the large object causing AC to be activated. How do I prevent it from turning on?

This is what I have done. I have a model in maya and a camera in maya that has an image plane set up on the camera. Since Zbrush doesn’t bring in Maya camera image planes, I made a polygon the same size and place as the camera’s image plane. I FBX export the Maya camera, fake image plane geo, and scene geo which is a persons helmet. I FBX import into Zbrush and everything lines us really well. not 100 perfect but 95 percent which is good enough for me. Zbrush Universal perspective camera is active.

The problem is if I append a large piece of geo to my helmet model, the perspective changes and the little helmet no longer lines up with the fake image plane card geo. I noticed that AC is active when the large piece of geo is in my model as a subtool. If I delete the large geo, AC turns off and my helmet then lines up with the fake image plane again.

So how do I turn off AC or get it to ignor the large geo? The large geo is large flat plane I will be sculpting around my helmet and other objects. I really don’t want to break my large ground geo up into tiny pieces just to get a perspective camera to keep working. Thanks for any help.

#2

Zber, I’m not aware of any way to disable AC from the documentation. I’m not sure you would want to–it’s there for a reason. There’s a Support article on the subject here.

Your problem here seems to be that you are working on two different models in the two programs. You added a large piece in ZBrush to account for differences in the way the two programs work after importing, but that piece alters the size of your model significantly and should be present in your other program as well for when you are setting up the camera, even if you toggle off the visibility.

I’m not sure if the camera will then import correctly to your needs, but this seems problematic.

If you want to keep AC from kicking in, you will need to reposition your camera.

#3

Thanks Spyndel for the help.

I have the same models in both programs. The small model is a helmet on the floor and the large model is a very large ground plane the helmet sits on.

When I append in the large ground plane, the bounding perimeter for AC is taking that large geo into account also. However, I don’t want it to because I’m only working on the small helmet.

I guess I’m looking for the AC bounding perimeter to only consider the active subtool instead of all visible subtools.

Sounds like this is more of a feature request I suppose now that you have helped me understand better what is going on with the AC.