while experimenting with the displacement level on a new brick material, i had two 90 degree surfaces which were rendering as though disconnected - as if the top surfaces were rotated 30 degrees (see first image below) "keep continuity" was enabled in all circumstances. tried to fix it by changing the disp. map, parameters, bitmap orientation, mirroring, etc. but nothing worked. finally i sampled and 'eyedropped' the maps from one of the corners that rendered correctly. in order for brick length to appear correct in the model, i had to delete a line i had on the red axis (a boundary for the two texture maps). i reoriented the line to the perpendicular brick wall, on the green axis. now the render turns out as it should be, with continuity between the two 90 degree surfaces.
the problem is gone, except for one small crack, but i don't get why the geometry should affect displacement. can anyone explain?
using 1.48.90
original - bad.
changed - good.
