I have a serious problem with the filtering of imported bitmaps in fill layers. I noticed this at first when importing base color images that I had to export to Mudbox to properly seam, since painter does not fully support UDIM's. In the course of investigating that issue I noticed something even worse. I wanted to add some height to some blood on my model, so I used a mask and the height channel to create it. In order to have the blood override the base normal map I needed to load it into a fill layer, since "replace" will not work with a map loaded in the "additional maps" normal slot. By doing this, filtering ruins the seams on all the maps.
On the right you will see the normal maps as exported from Zbrush. When they are plugged into the "additional maps" slot they look the same. As soon as they are added to a fill layer however, the seams wind up looking like the image on the left. Changing the type of filtering seems to have no effect whatsoever.
There seems to be no way to turn off filtering for a fill layer. Is there any way to fix this? Any help would be appreciated. I am using version 2017.1.0 build 1661. Thanks.
