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Iray stops too early

XoechZXoechZ Posts: 1,102
in The Commons

Hello!

I have set up a simple image and rendered it in Iray. After about 5 minutes the render was finished.

But if you have a look at the image (attached below), you can clearly see that it is NOT finished yet. It is still a bit grainy and has many white spots. It definitely needs to render longer.

I have some experience with Luxrender which renders until you stop it. Can I set up Iray in a way that it behaves like Lux? So that it renders until I stop it? And not declare a render finished that is not?

 

test.jpg
1000 x 1500 - 309K

Comments

  • NovicaNovica Posts: 23,925

    If you go to your Render Settings, you will see there is a max samples and also max time seconds. It's under Progressive Rendering. If you have one of those too short, it will stop the render.

  • BobvanBobvan Posts: 2,653
    edited February 2016

    Coming from Reality lux had same issues. I have had many suggestions made longer quality and ratio times seem to work best..

    Post edited by Bobvan on
  • prixatprixat Posts: 1,617

    ...and check that the firefly filter has not been switched off.

    Under Render Settings/Filtering

  • SpottedKittySpottedKitty Posts: 7,232
    XoechZ said:

    I have set up a simple image and rendered it in Iray. After about 5 minutes the render was finished.

    Note that Iray is a bit like LuxRender, its renders don't have a "finished" trigger, they keep going until one of the three stop conditions are met — and only one of them, Convergence, is related to how close to finished the render actually is. One gotcha is that the default Convergence limit is only (I think) 95%, and depending on the makeup of the scene and lighting, that last few % can be vital. It isn't recommended to push the value all the way to 100%, but putting it up to 99% or a bit higher should improve the final result.

  • XoechZXoechZ Posts: 1,102

    Thanks to all for your answers!

  • ChuckdozerChuckdozer Posts: 453

    The best way I've found to force a render to keep going is changing the "Render Quality" setting. I believe the default is "1.0". I usually work with this at a setting of at least "1.5" or "2.0", which causes the image to render about 1.5 to 2 times longer that it would at the default setting. If your render is only running for about 200 to 500 iterations and reaching 95% completion in about five minutes or less, raising the "Render Quality" from "1.0" to "10.0" will cause the render to run to about 2500 to 5000 iterations or more... depending on the complexity of your scene. You can turn the "Render Quality" as high as you need to... I think to a maximum of "100.0". Be sure to extend the maximum time if needed,  and increase the maximum iterations settings if the default does not produce a high enough quality image.

     

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