iray settings (for beginners)

Comments

• felis Posts: 5,723

  May 29

  There is something like this https://www.daz3d.com/iray-expert-guide-creating-shaders-and-realistic-lighting

  I don't have it, but I would guess it is relevant.

  I thought that Jay Verluis might have some videos on it, but haven't found any. It is all on render settings.

  The base group in Iray uber is the base settings like base color, translucency (if relevant) and glossyness.

  Volume is for subsurface scattering, essential for skin.

  Metallic flakes, Top coat and emissions is kind of special effects for the surface.

  Geometry is relevant for cutout oppacity and displacement (if you want to use that). The rest in that group is special.

  I would suggest creating some primitives and experiment. With primitives it will render fast.

  Others might have some real tutorials.
• SteveM17 Posts: 1,060

  May 29

  Thank you. Which setting reduces the grainy/speckled effect of Iray rendering?
• Richard Haseltine Posts: 107,878

  May 29

  SteveM17 said:

  Thank you. Which setting reduces the grainy/speckled effect of Iray rendering?

  Generally time or lighting - Iray traces the paths followed by the light rays and averages the results over multiple passes so areas that are hard to reach may get a mix of hits (creating bright spots) and misses (leaving them dark) until the render has been running for a while; adding more lights in new positions can help to fill in those hard to reach areas and so reach a settled value sooner. High contrast, noir-style lighting is quite hard to do in Iray (though you can adjust the tone mapping to help).
• markusmatern Posts: 597

  May 31 edited May 31

  SteveM17 said:

  Thank you. Which setting reduces the grainy/speckled effect of Iray rendering?

  I usually use post denoisers:
  See also here: https://www.daz3d.com/forums/discussion/comment/8349526/#Comment_8349526

  Post edited by markusmatern on May 31
• Chezjuan Posts: 537

  May 31

  Richard Haseltine said:

  SteveM17 said:

  Thank you. Which setting reduces the grainy/speckled effect of Iray rendering?

  Generally time or lighting - Iray traces the paths followed by the light rays and averages the results over multiple passes so areas that are hard to reach may get a mix of hits (creating bright spots) and misses (leaving them dark) until the render has been running for a while

  In many scenes that have lower light levels or multiple reflective surfaces, Daz Studio will hit the default iteration limit before the image has converged enough to get rid of the noise. If you have a powerful GUU you can increase the iterations and time limit to have most, if not all, of the noise rendered out. I changed my the progressive render settings to 15000 iterations and 36000 seconds. It is rare to have a render stop due to reaching a limit, though I have had one or two scenes with complex structure and lighting hit the 15,000 iterations. 
• felis Posts: 5,723

  May 31

  I had an image, when it got to 15000 iterations, it was only at 50% convergence. There was plenty of light, and the image looked fine. No noise. I could problably have stopped it at 5000, already looked fine there, but it was only at 10 % so I let it render.