Curious bug on mipmaps

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Cracklings
Posts: 4
Joined: 08 Apr 2018, 03:54

Curious bug on mipmaps

Post by Cracklings » 08 Apr 2018, 04:39

Hello there.
  1. Problem: So on one of our dev machines, we've encountered a very peculiar behavior of the Ventuz renderer where, in a material - texture loader, if we turn off the "GenMipMaps" option, everything appears to be fine, but with the option on (or loaders that do not have that option, so it apparently defaults to be on), the sample seems to be blurred about 2x. This only happens after running Ventuz 5 for "a while" (doesn't seem to be time or workload dependent, but the problem only kicks in after switching scene or alt-tabbing as far as we can tell), and it is designer specific. VPR works fine. We're not sure whether it's Ventuz build specific, but it at least happened on all patches of 5.3. Haven't been able to test 5.4 yet.

    What we've already tried:
    • It's probably not the hardware spec, since we have 5 machines with exactly the same spec (and the same OS build + GCard driver), and only 1 has the problem.
    • System temperature seems to be normal.
    • Full-screening doesn't interfere with the behavior.
    • Reopening a scene or even a solution doesn't fix the problem, but restarting the designer does.
    • Reinstalling Ventuz did not fix the problem, and reinstalling the OS is currently not an option.
MfG
-C

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Karol
Posts: 560
Joined: 10 Jan 2012, 12:07

Re: Curious bug on mipmaps

Post by Karol » 09 Apr 2018, 09:55

Hi,

can you post a small demo scene and screenshots?

Best Regards
Karol

Cracklings
Posts: 4
Joined: 08 Apr 2018, 03:54

Re: Curious bug on mipmaps

Post by Cracklings » 10 Apr 2018, 11:50

Screenshot

The only difference between the 2 rows is that the 1st row has GenMipMaps turned on, and the second doesn't.

Image

Resolution of the test images range from 1k to 2k.


mipmap.vzs

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