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  1. Firestorm
  2. FIRE-11929

[BUG-4087] [MAINT-3302] Some prims have black moire-like patterns when ALM is enabled

    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: Phoenix Firestorm 4.5.0, Phoenix Firestorm 4.5.1, Phoenix Firestorm 4.6.1, Phoenix Firestorm 4.6.5, Phoenix Firestorm 4.6.7, Phoenix Firestorm 4.6.9, Phoenix Firestorm 4.7.1, Phoenix Firestorm 4.7.2, Phoenix Firestorm 4.7.3, Phoenix Firestorm 4.7.4
    • Component/s: Rendering
    • Environment:
    • SL Avatar Name:
      Whirly Fizzle
    • Reported In:
      Firestorm 4.5.0 CHUI

      Description

      Its easiest to build these prims up in the sky so you can easily cam around and under them.
      Strange moire-like patterns happen whether actual shadows and ambient occlusion are enabled when ALM is enabled or not but the effect is strongest when ALM is enabled but ambient occlusion is disabled and shadows are set to none.
      Sun can be set at midday, but sun direction doesnt appear to matter.

      Repro 1

      1. Rez a torus
      2. Set Size to: X=0.3, Y=10 and Z=10
      3. Set Twist to: B=90 and E=90
      4. Set Hole Size to: X=1.00 and Y=0.5
      5. Change object type to ring.
      6. Look at the underside of the prim.

      Observed Behaviour

      • With ALM disabled you will see
      • With ALM enabled (Ambient occlusion and shadows disabled) you will see
      • With ALM enabled & ambient occlusion enabled (shadows disabled) you will see the black patterns are lighter grey
      • With ALM enabled, Ambient occlusion enabled & shadows enabled, you will see the same as the image above apart from when cammed very close to the prim, it appears as expected.
      • The black patterns change as you move camera angle.
      • When sun is set to midday and you are looking underneath the prim, the way the sunlight shines through the centre of the prim also doesn't seem to be expected behaviour, which happens when ALM is enabled or disabled - the circle of light is just more concentrated with ALM enabled.

      Expected Behaviour

      • Not to see the black moire patterns when ALM is enabled.
      • Not to see the sunlight shining through the centre of the solid prim when looking underneath.

      Repro 2

      1. Rez a tube
      2. Size to: X=0.035, Y=1.5 and Z=1.5
      3. Set Twist to: B=-360 and E=360
      4. Set Hole Size to: X=1.00 and Y=0.50
      5. Set Path cut to: B=0.0 and E=0.5

      Observed Behaviour

      • When ALM is enabled, you will see black moire patterns on the upper and undersides of the prim.
      • With ALM disabled
      1. Example.png
        760 kB
      2. Example2.png
        157 kB
      3. teXM1rfO.png
        12 kB

        Issue Links

          Activity

          Hide
          whirly.fizzle Whirly Fizzle added a comment -

          Still repros on 4.7.2 builds & current LL viewer.
          I was hoping this was fixed because FIRE-12401 is now fixed, but no....

          Show
          whirly.fizzle Whirly Fizzle added a comment - Still repros on 4.7.2 builds & current LL viewer. I was hoping this was fixed because FIRE-12401 is now fixed, but no....
          Hide
          whirly.fizzle Whirly Fizzle added a comment -

          Repro 2

          • Upload attached texture teXM1rfO.png
          • Rez a cube & sphere prim & apply teXM1rfO.png as the normal map.
          • Set diffuse texture to blank.
          • Enable ALM
          • Observe the moire patterns on the prims as you move camera - midday sky works fine for this.

          Sphere: http://prntscr.com/87sr8w
          Cube: http://prntscr.com/87srj8

          Repro 3

          Show
          whirly.fizzle Whirly Fizzle added a comment - Repro 2 Upload attached texture teXM1rfO.png Rez a cube & sphere prim & apply teXM1rfO.png as the normal map. Set diffuse texture to blank. Enable ALM Observe the moire patterns on the prims as you move camera - midday sky works fine for this. Sphere: http://prntscr.com/87sr8w Cube: http://prntscr.com/87srj8 Repro 3 Also affects some trunks of Linden trees. Rez a Cypress 1 LL tree & cam around the trunk. At certain cam angles you will see: https://gyazo.com/ed910cf3c9afb7180e0b311fcac1df9f

            People

            • Assignee:
              shouldbeworkingonit.linden ShouldBeWorkingOnIt Linden
              Reporter:
              whirly.fizzle Whirly Fizzle
            • Votes:
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              Watchers:
              1 Start watching this issue

              Dates

              • Created:
                Updated: