While Backface Mask works perfectly when sculpting, I can’t get it to work at all for drawing a mask. No matter how I set it, no matter how thick the object is, the mask still shows through on the back side of the object. Is there some setting I’m missing?
Are you using the Pen mask? If so, be sure to hold Ctrl when accessing and changing the brush/automasking options.
Otherwise, backface masking will not work with the Rectangle, Lasso, and other forms of masking as these tools are designed to cut straight through the screen/document space rather than care about the normals of the mesh. An alternative is to create a Polygroup based on the view (Polygroup: Group Front) so that you can first hide the back-facing polygons before trying to draw out a mask.
Yes, I’m using the Pen mask. I’ve tried several different brushes and still get the same result. I have discovered in the last hour that if the object is thick enough (too thick to work with, however) that the mask won’t seep through to the back. I’ve had differing results on similar objects. Sometimes, but not always. I can get around the issue by using polygroups and manipulating those, but that’s a kind of long route to get what should be a simple mask.
And you’re positive that you’re enabling backface masking (with BackMaskInt set to 100) on Maskpen itself, and not whatever sculpting brush you otherwise currently have selected? It’s working perfectly fine for me, even on super micro-thin meshes.
Without videos/screenshots of it in action, the only other things I can think of is that you might be referring to actual backfaces, which are only visible when the “Double” display property is added. If so, then then those backfaces are different than what the Backface Automasking is referring to (example: the inverse side of a single polygon, whereas the automasking option would be more like multiple polygons that have some facing away from the current view).
That or symmetry is on for that axis, causing your stroke to be applied to the opposite side since that would render that particular form of automasking pointless.