Just added more material types into the current implementation, here are some results:
![Rough xyzrgb dragon [11,000 spp] [uni-dir PT]](https://i0.wp.com/hypeng.net/wp-content/uploads/2016/05/yellow_plastic_dragon_glass_sphere_11000spp.png?w=583&h=437&ssl=1 "yellow_plastic_dragon_glass_sphere_11000spp")
Rough xyzrgb dragon [11,000 spp] [uni-dir PT]
![Plastic xyzrgb dragon [5,000 spp] [uni-dir PT]](https://i0.wp.com/hypeng.net/wp-content/uploads/2016/05/yellow_plastic_dragon_glass_sphere_5000spp.png?w=289&h=217&ssl=1 "yellow_plastic_dragon_glass_sphere_5000spp")
Plastic xyzrgb dragon [5,000 spp] [uni-dir PT]
![Silver xyzrgb dragon [5,000 spp] [uni-dir PT]](https://i0.wp.com/hypeng.net/wp-content/uploads/2016/05/silver_sp5000.png?w=289&h=216&ssl=1 "silver_sp5000")
Silver xyzrgb dragon [5,000 spp] [uni-dir PT]
![Gold xyzrgb dragon [5,000 spp] [uni-dir PT]](https://i0.wp.com/hypeng.net/wp-content/uploads/2016/05/gold_sp5000.png?w=436&h=327&ssl=1 "gold_sp5000")
Gold xyzrgb dragon [5,000 spp] [uni-dir PT]
![Copper xyzrgb dragon [5,000 spp] [uni-dir PT]](https://i0.wp.com/hypeng.net/wp-content/uploads/2016/05/copper_sp5000.png?w=436&h=327&ssl=1 "copper_sp5000")
Copper xyzrgb dragon [5,000 spp] [uni-dir PT]
hypeng 