Hi all. The problem with the original tap scene was caused by different behavior of standard bitmap vs coronabitmap and "no tilling" option. Clamp tilling didnt worked, because mask was cropped in a way, that it had no "bleed" and there are both black and white pixels on the edge. (see picture for better understanding) In crop mode black and white pixels on the edge are stretched to infinite and creates stripes on the object.
There are 3 solutions:
1. use some "bleed" on the masks, so all pixels on the edge of the bitmap are black. Then crop option in tilling mode will work well. (best option)
2. use standard bitmap for masks
3. use composite map to comp mask with black color background. Then you can use "no tilling" option in coronabitmap.
Attachments: original mask with bad cropping + reproduced problem on simple scene