Problems with Iray (grainy or rendering too much)
AlienRenders
Posts: 793
I have two problems. The first is when I use Iray in the viewport, it always renders 5000 frames no matter what I do. It even renders 5000 frames on an empty scene. I suppose I could reduce the number of frames in Render Settings, but I didn't need to do this before.
The second problem is when doing a full render where I use anything except "Scene Only", it converges too quickly and it's all grainy.
Anyone else having these problems? It didn't used to do this. But this started happening about two weeks ago.
Daz 3D is part of 
Connect
DAZ Productions, Inc.
7533 S Center View Ct #4664
West Jordan, UT 84084
Licensing Agreement | Terms of Service | Privacy Policy | EULA
© 2025 Daz Productions Inc. All Rights Reserved.
Comments
If you haven't already, you might hit the Defaults buttons to return everything to their default values. Some changes sneak past. Try again to see what you get.
WOW! Thanks! That fixed the graininess during a full render. Still renders 5000 frames in the viewport though. I can't find any "default" button for the Draw Settings.
The Default button is all-or-nothing. It resets all of the options in the Iray Render panels, though it's still a good idea to manually check. By default, I recall Draw Dome is on, as is ground shadows.
Depending on the scene and the speed of your card, 5000 iterations may just happen to be the first stop-at value Iray gets to -- the other two is time (defaults at 2 hours) and convergence ratio (95%). For most people it's usually the convergence ratio or time that's met first, but it's the first condition that's met that will stop the render.
That's just it. Convergence is never hit when I use Iray in the viewport. It's well past finished rendering quality wise at around 200 frames on a single figure. It never gets that far with a full render. But in the viewport? 5000 frames no matter what. Like I said, it'll render 5000 frames on an empty scene. No way that didn't converge.
The latest Iray update did bring about some changes to how quickly renders converge. I have also noticed on some occassions images converging to 100% pre-maturly, with some graininess still in the image. Upping the "Render Quality" slider took care of this issue for me though.
The main problem I'm having is that Iray is rendering 5000 frames in the viewport no matter what. It's completely ignoring Render Quality and the convergence settings.
Here's my log on a 100% completely empty scene.
2017-04-29 23:18:31.404 Iray INFO - module:category(IMAGE:IO): 1.0 IMAGE io info : Loading image "C:\Program Files\DAZ 3D\DAZStudio4\shaders\iray\resources\DTHDR-RuinsB-500.hdr", pixel type "Rgb_fp", 512x256x1 pixels, 1 miplevel.
2017-04-29 23:18:31.420 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Updating geometry.
2017-04-29 23:18:31.467 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Using OptiX Prime ray tracing (3.9.1).
2017-04-29 23:18:31.467 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Importing geometry.
2017-04-29 23:18:31.467 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Geometry import (1 object with 2 triangles, 1 instance yielding 2 triangles) took 0.000179
2017-04-29 23:18:31.467 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Updating materials.
2017-04-29 23:18:31.467 Iray INFO - module:category(MATCNV:RENDER): 1.0 MATCNV rend info : found 1 textures, 0 lambdas (0 unique)
2017-04-29 23:18:31.482 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Emitter geometry import (1 light source with 2 triangles, 1 instance) took 0.00s
2017-04-29 23:18:31.482 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Updating environment.
2017-04-29 23:18:31.498 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Updating lens.
2017-04-29 23:18:31.498 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Updating lights.
2017-04-29 23:18:31.498 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Updating object flags.
2017-04-29 23:18:31.498 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Updating caustic portals.
2017-04-29 23:18:31.498 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Updating decals.
2017-04-29 23:18:31.498 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Allocating 1 layer frame buffer
2017-04-29 23:18:31.498 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Using interactive scheduling, architectural sampler unavailable, caustic sampler disabled
2017-04-29 23:18:31.514 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Initializing local rendering.
2017-04-29 23:18:31.545 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Rendering with 1 device(s):
2017-04-29 23:18:31.545 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : CUDA device 0 (GeForce GTX TITAN X)
2017-04-29 23:18:31.545 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Rendering...
2017-04-29 23:18:31.576 Iray INFO - module:category(IRAY:RENDER): 1.6 IRAY rend info : Initializing light hierarchy.
2017-04-29 23:18:31.576 Iray INFO - module:category(IRAY:RENDER): 1.6 IRAY rend info : Light hierarchy initialization took 0.00s
2017-04-29 23:18:31.795 Iray INFO - module:category(IRAY:RENDER): 1.4 IRAY rend info : CUDA device 0 (GeForce GTX TITAN X): Scene processed in 0.252s
2017-04-29 23:18:31.826 Iray INFO - module:category(IRAY:RENDER): 1.6 IRAY rend info : CUDA device 0 (GeForce GTX TITAN X): Allocated 8.85983 MiB for frame buffer
2017-04-29 23:18:31.857 Iray VERBOSE - module:category(IRAY:RENDER): 1.4 IRAY rend progr: CUDA device 0 (GeForce GTX TITAN X): Processing scene...
2017-04-29 23:18:31.873 Iray VERBOSE - module:category(IRAY:RENDER): 1.6 IRAY rend stat : Geometry memory consumption: 400 B (device 0), 0 B (host)
2017-04-29 23:18:31.873 Iray VERBOSE - module:category(IRAY:RENDER): 1.6 IRAY rend stat : Texture memory consumption: 1024 B (device 0)
2017-04-29 23:18:31.873 Iray VERBOSE - module:category(IRAY:RENDER): 1.6 IRAY rend stat : Lights memory consumption: 948 B (device 0)
2017-04-29 23:18:31.873 Iray VERBOSE - module:category(IRAY:RENDER): 1.6 IRAY rend stat : Material measurement memory consumption: 0 B (GPU)
2017-04-29 23:18:31.873 Iray VERBOSE - module:category(IRAY:RENDER): 1.6 IRAY rend stat : Materials memory consumption: 12.9102 KiB (GPU)
2017-04-29 23:18:31.920 Iray INFO - module:category(IRAY:RENDER): 1.4 IRAY rend info : CUDA device 0 (GeForce GTX TITAN X): Allocated 848 MiB of work space (1024k active samples in 0.086s)
2017-04-29 23:18:32.436 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Received update to 00001 iterations after 0.877s.
2017-04-29 23:18:32.436 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Rendering...
2017-04-29 23:18:32.451 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Received update to 00002 iterations after 0.892s.
2017-04-29 23:18:32.467 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Received update to 00004 iterations after 0.907s.
2017-04-29 23:18:32.498 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Received update to 00008 iterations after 0.937s.
2017-04-29 23:18:32.561 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Received update to 00016 iterations after 0.991s.
2017-04-29 23:18:32.654 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Received update to 00031 iterations after 1.088s.
2017-04-29 23:18:32.842 Iray INFO - module:category(IRAY:RENDER): 1.0 IRAY rend info : Received update to 00061 iterations after 1.271s.
And then it proceeds to render 5000 frames.
Maybe this is how viewport rendering works. I don't have nearly enough hardware to wait around for 5000 iterations, so I've never experienced this. The viewport renders are a special Iray mode (real time) and it may not have all the features or functionality of Photoreal mode.
It worked correctly until about 3 weeks ago. Trying to figure out what changed. Note that it renders 5000 frames on an empty scene. It definitely did not draw anything on an empty scene before.