Hey, There was a discovered bug in OSL-1.6.9 which made Voronoi texture to work incorrectly. The bug was fixed in OSL-1.7.1 which was recently released. I would ask platform maintainers to update OSL to 1.7.1. P.S. After the update is done, i would also ask users to give it a good test :) -- With best regards, Sergey Sharybin