I haven’t posted much this year (I have a few new images that I will eventually upload to DA) but lately I have been working on an old project and testing DazStudio’s Iray. Here is a test I did to compare IRay (on the left) with Reality (on the right). For the test I used Cassie for Teen Josie 6 and Kita Hair and, for light, DTHDR-MauiA from Daz Studio Iray HDR Outdoor Environments. The Reality/Luxrender render used Cassie’s Reality’s preset shader, the Iray render used the default SSS shader for the character.
I tried to use the same settings for the tone mapping (shutter: 1/128; F-Stop: 8; ISO: 100) but in Reality/Luxrender the image was too dark so, after a few trials, I found I had to change them to 1/60, 4 and 100 respectively and rotate the Reality IBL Sphere by 150º. In Reality I also had to change the hair from glossy to matte to get it close to the Iray render. After a few trials I set the film response in Reality/Luxrender to Kodak Portra 800. Since this was a test I rendered the Iray image with 5000 max samples and stopped the Reality/Luxrender render when it reached 1.13 kS/p (I usually let it go up to 3 or 4 kS/p). The Iray render took one hour (CPU + GPU), the Reality/Luxrender about six hours (just CPU) on an 8 core MacPro @ 2.8 GHz running MacOS 10.10.3 with an NVIDIA GeForce GT 120 (512 MB) with the latest CUDA driver (6.5.51) and the GPU Driver Version 10.0.31 310.90.10.05b12.
I like the Iray render but I’m not going to ditch Reality any time soon.