as far as i know studiopaint 3d as in the 2D/3D paint/texturing hybrid with hardware brushes was not ported but abandoned in 2000. instead a new module that perhaps shares the name was developed as part of alias studio on other platforms than irix. but i believe that is strictly 2D and a concepting tool?
irix studiopaint functionality on the 3D/texturing side can be found nowadays in mari by the foundry (and a lot more, obviously). also studiopaint's interface seems to have been the inspiration for mudbox which also has some (unrelated) paint functionality and adopted SP3D's methods for adjusting brush resize/pressure with gestures as well as the shelves. mudbox also shares the very handy snap-paint-stroke-to-curve function with studio paint.
both programs have originally been developed at weta which was known as a place using studio paint a lot in the texturing pipeline for a good few years and way after the software was discontinued.
irix studiopaint functionality on the 3D/texturing side can be found nowadays in mari by the foundry (and a lot more, obviously). also studiopaint's interface seems to have been the inspiration for mudbox which also has some (unrelated) paint functionality and adopted SP3D's methods for adjusting brush resize/pressure with gestures as well as the shelves. mudbox also shares the very handy snap-paint-stroke-to-curve function with studio paint.
both programs have originally been developed at weta which was known as a place using studio paint a lot in the texturing pipeline for a good few years and way after the software was discontinued.