I wish to make a 75% cut angle in a rectangle. I am using 3.5 bought also have 3.1. I know this is a basic operation, but I can’t seem to figure it out. Isn’t there a way to make a clean cut? One that maintains a solid edge? I have masked off the area i want protected. the unmasked portion is that which i wish to shear cut.
I can’t seem to get the planar brushes to properly cut. any suggestions?
I suppose my question is just too stupid.
Nah, don’t feel dumb for asking questions, 3d is complex stuff 
This place doesn’t get as much traffic as you think. Plus, a lot of the traffic is people posting art, or viewing art.
I’m on the mac, so I don’t have those glorious planar brushes just yet, but I bet that’s your ticket. Now I’m not sure about doing an exact cut to 75 degrees, as a lot of ZBrush is more free style than mathematical. That’s why I love it though.
Check out the planar/trim brush vids in the ZClassroom here, and see if that helps you: http://www.pixologic.com/zclassroom/homeroom/
If you’re wanting a clean looking cut, you will need more geometry. Subdivide it more in the tool>geometry menu. Another option would be to use masking, as you have in your image (but on a higher sub division level so it’s not blurry), and use the flatten brush. The planar brushes gotta be your answer though!
