iRay noise and artifacts

Martinjfrost

I fisrstly should say that i like real world render engines, and have been using vue and reality with great happyness. I was overjoyed when iRay was introduced to Daz Studio, however i just cant seem to get away from a huge amount of noise and artifacts. Things are ok on solid surfaces, but as soon as there is any kind of subsurface scattering things get... noisy.

I have looked at the tutorials reccomended here, and over at devian art. However im still getting noise. 

Im sure its me and not Studio, but i cant for the life of me seem to get render settings that work.

SO can anyone shed some light on this? Is it something glaringly obvious? Is there a tutorial i missed.

Or even better could somone forward me a set of fuz free rendersettings or a scene file that i can install and look at to work it out as it seems no amount of reading is doing the trick! thanks!

 

mjc1016

Examples...render and settings...

They would make it easier to try and figure out what is going on.

Martinjfrost

It does not seem to matter what render settings i use.... ive tried lengthening the render time and making min samples smaller and max samples bigger. Ive tried the filters... with varing results but still got noise.  The scen im playing with has a bunch of light sourses and is also using the aslan court iray add on. Ive upped the light levels in the minator render and used two mesh lights and a reflector.... with a ten hour render I have a nvida card so all go on that score but still get the noise.   

 

Richard Haseltine

What are your light settings in the Render Settings Environment group?

nonesuch00

Those looks like typical camera photos in very low light.

I'm curious to know is there a environmental candela measuring tool, even though it's just a simulation, that you could put at x, y, z to see how much light is at that point in a scene?

Richard Haseltine

nonesuch00 said:

Those looks like typical camera photos in very low light.

I'm curious to know is there a environmental candela measuring tool, even though it's just a simulation, that you could put at x, y, z to see how much light is at that point in a scene?

If you switch to the nVidia Iray preview mode (ctrl(Win)/cmd(Mac) 0  or click the sphere next to the camera/viwe drop-down) then an exposure meter widget appears next to the sphere for the drawstyle drop-down - click that, then click an area that should be well lit in the view port.

Martinjfrost

Here you go.

mjc1016

That shutter speed is horrible...that is 1/250th of a second...so it's super 'fast' with that f-stop and a film speed of 175, I'm surprised it's not almost completely black. 

Drop the shutter to about between 4 and 25 (10) should be fine.  Then put the f-stop at 5.6 and the ISO at 200.

That map looks a bit odd...can you give the file name?

And is there a 'physical' skydome in the scene/what is the backdrop?

 

nonesuch00

Richard Haseltine said:

nonesuch00 said:

Those looks like typical camera photos in very low light.

I'm curious to know is there a environmental candela measuring tool, even though it's just a simulation, that you could put at x, y, z to see how much light is at that point in a scene?

If you switch to the nVidia Iray preview mode (ctrl(Win)/cmd(Mac) 0  or click the sphere next to the camera/viwe drop-down) then an exposure meter widget appears next to the sphere for the drawstyle drop-down - click that, then click an area that should be well lit in the view port.

Ah neat. Thanks

Tobor

 

One answer might be 'more cowbell,' but the one that will give you better renders is 'more light.' If you want to reduce render times and get rid of that noise, you need more light.

Please note that fiddling with the tone mapping controls doesn't add more light, any more than changing a setting on a real camera alter the lighting in a room.