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Noise in Iray Render

CoyoteVisionsCoyoteVisions Posts: 13
edited December 1969 in Technical Help (nuts n bolts)

Working on a scene and have started encountering noise that gets worse as it renders. Have tried a variety of setting changes, as well as restoring to all default, and so far no luck. Anticipate I am missing something obvious and hoping someone can point me in the correct direction for resolving this. Using D4.8 Iray, V7 with base mats. Suggestions?

ImageNoiseSample.jpg
351 x 453 - 52K

Comments

  • SzarkSzark Posts: 10,634
    edited December 1969

    It could be down to many things. Here is a thread about grainy render http://www.daz3d.com/forums/discussion/58034/

  • CoyoteVisionsCoyoteVisions Posts: 13
    edited December 1969

    Great - thank you for pointing me in that direction, I appreciate it. I will review, try out the possible causes/fixes noted there, and post an update regarding the results.

  • SzarkSzark Posts: 10,634
    edited December 1969

    Like I said it could be a number of things, not enough light, too much reflection, not enough samples etc etc. Or all 3. :)

  • CoyoteVisionsCoyoteVisions Posts: 13

    Took longer to cicle back on this than I expected, but I wanted to be sure to close the loop. After reducing the reflection and increasing the samples, the noise cleared up. THANK YOU again for pointing me in that direction, much appreciated.

    Russ

  • ToborTobor Posts: 2,300

    Those are fireflies (bright spots), which are a different manifestation of noise you get from unconverged pixels (usually dark spots). You did the right things to fix them. Also, be sure the Firefly Filter Enable option hasn't become accidentally turned off.

  • CoyoteVisionsCoyoteVisions Posts: 13

    Thank you for the tip. When attempting to address the problem, I adjusted many things (including the overall composition the further I dug into it.) May have tweaked the Firefly Filter without knowing it, wouldn't be surprised. I appreciate the feedback and will make it a point to check for that should I encounter this again.

    For the "for what it is worth file", before making the adjustments that eventually resolved the issue, I discovered rendering at a very high resolution - much higher than I needed the final render to be, and then using a Despeckle filter with minimum numbers in PS or GIMP so not to destroy other details also did the trick as a quick and dirty fix. That said, I believe fixing it by adjusting render settings, lights, and/or reflectivity is the way to go.

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