Hi, using Max 2014 and vray 3.
Using hdri map in Vray enviroment slots (only way to could get it work properly with matte floor and lighting). i get these “blotches”, specially when i use the hdri maps with VrayHDRI material, when i just use them as imported bitmaps there is way less blotches but still too noticable. turning up GI settings only make the blotches smaller and more frequent/defined. blotches also appear slightly on the matte floor.
Bitmap(SAME hdri file… blotches still on ground, front bumper, top of hood):