in poser 8, as substitute for render GC, use exposure control: HSV exponential tone mapping 1.67 with gain 1.33, as in att img (d3d render firefly script; incl. in P8).  max settings shown for IDL - may cause slow renders.  usual method to learn how to do renders and shaders in poser 8 and later: search this forum, desired topic, user bagginsbill et al.  takes approx 18 months to learn how to do this.