Snow collects on furniture inside a roofed building #1037

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opened 2026-10-25 02:56:12 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-25 02:56:12 +00:00

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Snow collects on furniture inside a roofed cabin: indoor surfaces under a solid roof get a snow coat as if they were open to the sky.

Expected: surfaces under a roof stay clear. Snow cover should only build where the sky is open above (weather sky-openness / snow occlusion).

Seen: Vulkan renderer with snow weather active, inside a cabin build. The roof and walls appear to be ignored for the furniture inside.

To narrow down: whether the roof geometry is excluded from the snow occlusion source (alpha / phantom / mesh type / size), the occlusion map's resolution or extent at that spot, and whether it happens with other roofed builds.

Snow collects on furniture inside a roofed cabin: indoor surfaces under a solid roof get a snow coat as if they were open to the sky. **Expected:** surfaces under a roof stay clear. Snow cover should only build where the sky is open above (weather sky-openness / snow occlusion). **Seen:** Vulkan renderer with snow weather active, inside a cabin build. The roof and walls appear to be ignored for the furniture inside. To narrow down: whether the roof geometry is excluded from the snow occlusion source (alpha / phantom / mesh type / size), the occlusion map's resolution or extent at that spot, and whether it happens with other roofed builds.

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2026-10-25 02:56:12 +00:00

sky_line added this to the Slipstream project

2026-10-25 02:56:12 +00:00

sky_line commented

2026-10-25 02:59:43 +00:00

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Update from the owner: on a later build, indoor coverage in the same cabin was different and mostly gone. The bug is not deterministic and may depend on load time or the order objects load.

Likely mechanism to check first: snow accumulation that persists over time. If the furniture loads, and snow accumulates on it, before the roof appears in the snow occlusion source, the accumulated snow may not be removed once the roof arrives. Check:

whether accumulation is cleared or decays when a surface becomes covered;
whether the occlusion source is refreshed when new casters arrive.

Repro idea: teleport into the cabin while snowing with a cold object cache, so the roof loads late, then compare against a warm-cache login.

Update from the owner: on a later build, indoor coverage in the same cabin was different and mostly gone. The bug is not deterministic and may depend on load time or the order objects load. Likely mechanism to check first: snow accumulation that persists over time. If the furniture loads, and snow accumulates on it, before the roof appears in the snow occlusion source, the accumulated snow may not be removed once the roof arrives. Check: - whether accumulation is cleared or decays when a surface becomes covered; - whether the occlusion source is refreshed when new casters arrive. Repro idea: teleport into the cabin while snowing with a cold object cache, so the roof loads late, then compare against a warm-cache login.