Quote - Theoretically, a shading rate of 0.00 means infinite (literally forever) render time. FYI
Shading rate is the average area of a micropolygon. The lower this is, the more micropolygons. With an area of 0, you need an infinite number of micropolygons. The render will never actually begin, as each bucket will have to be filled with an infinite number of micropolygons first.

poser may have some internal 'minimum' in the code?  if you set min shading rate to 0.00 (in both the render settings and obj properties) it renders, albeit slowly.  this would make sense, since if setting it to 0.00 caused it to never render SM would be flooded with bug reports.

a while back - way back when firefly shipped with a ridiculously high min shading rate and all renders looked like crap - i recommended people render with a shading rate of 0.  at the time i didnt know that it took the higher of the two numbers (render or obj properties - and the latter defaulted to .2), so i guess i was recommending they render at 0.2 shading rate.  thanks for the clarification.