I could not get the matcaps from blender (2.9 standard matcaps) in exr format to work. Downloaded a matcaplibrary in png and it worked.
However, when I try to view the model in matcap, the framerate drops to 1-2 fps (estimated). On shaded model it runs smoothly (don't know exact framerate). 15m poly model. Could this have something to do with resolution of matcap? The matcaps i have tested are 1024.
Running latest stable 64 bit windows Pro release of MS.