Completed Renders Looking Incomplete

Greybro

I thought at one point, perhaps a version or so back that there was a way to set the DS IRay engine to just keep working on an image until all the little spots disappeared, such as in the attached engine. Lately, with 4.9 on occassion one the render has reached 100% I still see artifacts. Is this a setting I can change and if so where? Does Environment Resolution have anything to do with this? Please advise.

Bobvan

You have to let it run longer by adjusting the progressive render sliders. I let it run forever until I want it to stop for the most part

mjc1016

Bobvan said:

You have to let it run longer by adjusting the progressive render sliders. I let it run forever until I want it to stop for the most part

That's not going to be quite enough for the example posted...

The first thing in that image, is it appears to be somewhat overexposed, while still showing quite a bit of 'noise'.  This could be from several sources, but probably most likely poor material optimization.   Are the materials used on all the items in the scene dedicated Iray materials or autoconverted 3Delight materials?

The next item on the list...what lighting is being used? 

Is there an actual camera or is it rendered from the Perspective view? (this is for how to control the headlamp, which appears to be on...)

SpottedKitty

Greybro said:

I thought at one point, perhaps a version or so back that there was a way to set the DS IRay engine to just keep working on an image until all the little spots disappeared, such as in the attached engine.

That's not how Iray rendering works; the "fireflies" aren't actually related to how complete the render is, they're related to how well the scene is lit and how well the surface parameters are set. Get that right, and the fireflies will disappear quickly while render quality takes longer to improve. Note that if you rely on auto-converting the surfaces at render time you will not get perfect Iray settings, only something close. You should always manually convert all the surfaces in the scene, then tweak as necessary to fix all the "not close enough" conversions.

Greybro said:

Lately, with 4.9 on occassion one the render has reached 100% I still see artifacts.

You shouldn't ever see an Iray render at 100% — you can get very close to that, e.g. 99.9% or even higher, but if you try to force a render to 100% your computer can end up dealing with "impossible" numbers and D|S might crash. Note that going over the default value of 95% will increase render times.

Greybro

I highlight all the surfaces in the scene selection and shaders editor and then apply the iray uber base.

Greybro

mjc1016 said:

Bobvan said:

You have to let it run longer by adjusting the progressive render sliders. I let it run forever until I want it to stop for the most part

That's not going to be quite enough for the example posted...

The first thing in that image, is it appears to be somewhat overexposed, while still showing quite a bit of 'noise'.  This could be from several sources, but probably most likely poor material optimization.   Are the materials used on all the items in the scene dedicated Iray materials or autoconverted 3Delight materials?

The next item on the list...what lighting is being used? 

Is there an actual camera or is it rendered from the Perspective view? (this is for how to control the headlamp, which appears to be on...)

Where do I find this slider to adjust?

mjc1016

Is it a camera or perspective view?

If it's a camera the headlamp controls are under the parameters for the camera (on a camera by camera basis) or you could set auto headlamp (Render Settings) to Never.

Greybro

I understand the headlamp stuff completely. This is more about setting Iray to render infinitely.

mjc1016

The settings are under Render Settings > Progressive Rendering.

Throwing more time at it isn't necessarily going to make it better, especially with any GPU assited rendering (CPU only, you could hit the 2 hr time limit...or a very large/complex scene), then it is very likely that there is something wrong with the scene...most likely lighting problems, with materials being a close second.