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Tyran Huang avatar image
Tyran Huang asked ·

MaxToA renders weird random black dots, Please help.

arnold.jpgRendered using 3ds max MaxToA plugin 2.0.938. Any Pros out there can advice on how to solve these dots and what causes it. Can't seems to find any solution anywhere. Please, Thanks in advance.

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Let me know if I need to include any other infos to help solve this problem.

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Tyran Huang avatar image
Tyran Huang answered ·

Thanks Michiel Van Gasse's input and advice. Fixed my problem. What I felt was the cause is my CPU is not powerful enough to do high setting renders, or rather not enough threads. i5-6600k only have 4 threads, so it cause my system to be unstable. 3ds Max kept going "not responding" randomly while rendering. What I did to fix it was

  1. lowered my render setting by about 10%
  2. In render setup,go to system tab. Set the threads to -1, this should spare some cpu power for others.
  3. If 3ds Max still crashing or randomly not responding, go to task manager and set 3ds Max priority to below normal.

Hope this helps someone too.

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Roger Bacon avatar image
Roger Bacon answered ·

hi. I have solve that exact problem by changing the render resolution with from 1200 to 1208. It must be something related to the render resolution not being a multiply of 8

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We had a GPU rendering bug that had this resolution dependent black dots issue; it was fixed in Arnold 5.3.1. Are you doing GPU or CPU rendering and have you downloaded the latest build of arnold? If this is happening on the latest Arnold, is it possible to provide a repro?

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David Vivanco avatar image
David Vivanco answered ·

sometimes the type of filtering causes it.

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Michiel Van Gasse avatar image
Michiel Van Gasse answered ·

Try hiding objects to see if it makes a difference, could be a material on one object.

Check with a empty room if its the lights/hdri.

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Ok, I'll test it out.

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When I tried lowering the samples/rays, those dots are gone but more noises. Might be my cpu not good enough. I remembered when I render this yesterday, 3ds Max kept randomly goes "not responding" and then return to running. I'm trying one suggestion from another forum now, to set thread in 3ds Max to -1 for some spare cpu power.

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Maybe try setting the threads to 4 (to get max performance out of it). It shouldn't do it, so there is definitely something wrong. ;)

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