reduce roots refinement to 1 iteration, reshuffle code
reproduce roots accuracy divergence in scn_test09 (white dot)
refine paraboloid roots to fix accuracy divergence
reproduce accuracy divergence for hyperparaboloid (white dots)
reproduce accuracy divergence for hyperparaboloid (take 2)
reproduce accuracy divergence for hyperparaboloid (take 3)
refine hyperparaboloid roots to fix accuracy divergence
test accuracy divergence fix (2nd shot)
test accuracy divergence fix (1st shot)
revert test scenes to original, clean up comments