Static prims flagged as moving objects by float noise: rain and snow inside buildings, snow coat indoors #1166

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opened 2026-10-27 21:03:00 +00:00 by TheSlowly · 1 comment

TheSlowly commented

2026-10-27 21:03:00 +00:00

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Rain and snow fall inside closed, static buildings, and an avatar standing indoors gets a snow coat (#1165). RenderVKWeatherSnowDepthDebug shows the building flipping between covered (yellow) and mover (magenta) every few seconds. RenderVKShadowMoverSettleSecs 0 hides it.

Cause:

Indoors, the camera distance to the big prims around it is clamped to 0.01 m (vkStampMoveVisibility, pipeline.cpp). At that distance LL's damped ease never passes its end test (LLDrawable::updateXform), because the rounding of the reached rotation stays above it.
The eased pose then flips by single ULPs (0.03-0.06 mm, velocity 0) while the drawable stays on the move list.
The bit-exact pose compare in refreshObjectPose / applyComposedPose counts that as motion. The ingest marks the prims as dynamic casters (instance bit 21).
Movers are left out of the weather roof map, so the roof disappears for about 2 s at a time. Rain falls through it, and the avatar's exposure reads 1, which with #1160's fill cap builds a full coat.

Fix:

Snap an ease that is within float rounding of its target (RenderVKEaseSnapAtTarget).
Classify movers against a reference pose, using #1007's near-unchanged measure with a 2 mm threshold (RenderVKShadowMoverPoseThreshold). The comparison accumulates, so slow movers are still caught.

Related: #1145 (the remaining indoor leak after its PR), #1165.

Rain and snow fall inside closed, static buildings, and an avatar standing indoors gets a snow coat (#1165). `RenderVKWeatherSnowDepthDebug` shows the building flipping between covered (yellow) and mover (magenta) every few seconds. `RenderVKShadowMoverSettleSecs 0` hides it. **Cause:** - Indoors, the camera distance to the big prims around it is clamped to 0.01 m (`vkStampMoveVisibility`, pipeline.cpp). At that distance LL's damped ease never passes its end test (`LLDrawable::updateXform`), because the rounding of the reached rotation stays above it. - The eased pose then flips by single ULPs (0.03-0.06 mm, velocity 0) while the drawable stays on the move list. - The bit-exact pose compare in `refreshObjectPose` / `applyComposedPose` counts that as motion. The ingest marks the prims as dynamic casters (instance bit 21). - Movers are left out of the weather roof map, so the roof disappears for about 2 s at a time. Rain falls through it, and the avatar's exposure reads 1, which with #1160's fill cap builds a full coat. **Fix:** - Snap an ease that is within float rounding of its target (`RenderVKEaseSnapAtTarget`). - Classify movers against a reference pose, using #1007's near-unchanged measure with a 2 mm threshold (`RenderVKShadowMoverPoseThreshold`). The comparison accumulates, so slow movers are still caught. Related: #1145 (the remaining indoor leak after its PR), #1165.

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2026-10-27 21:03:00 +00:00

TheSlowly self-assigned this

2026-10-27 21:03:00 +00:00

TheSlowly added this to the Slipstream project

2026-10-27 21:03:00 +00:00

TheSlowly referenced this issue from a pull request that will close it,

2026-10-27 21:03:15 +00:00

#1166 Static prims no longer flagged as moving objects by float noise (rain / snow inside buildings) #1167