Volumetrics P3: volumetric cloud platforms from marked prims (cross-viewer convention) #720

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opened 2026-10-12 13:15:16 +00:00 by sky_line · 0 comments

sky_line commented

2026-10-12 13:15:16 +00:00

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Part of #722 (volumetrics epic).

Cloud platforms that aren't mesh (e.g. Cloudsdale).

Standing on it: the sim owns physics -- the platform is an invisible physical prim (or a mesh physics shape); the volumetric cloud is drawn around it.
Marker convention (decide before content is made): a specific uploaded "Slipstream volumetric cloud" texture on the prim's faces marks it. Parameters (density, softness, colour / tint, noise scale, edge falloff) packed into fields every viewer receives: colour, alpha, glow, texture repeats / offsets / rotation. Object descriptions (not sent with object updates) and custom glTF material extensions (not kept by the server) can't carry it.
Other viewers draw the prim with the marker texture -- design it to read as a soft cloud.
Rendering: prim-shaped local volume (P1) with noise; inside it, fog thickens around the camera.
Builder docs: how to make one, with the parameter mapping.

Part of #722 (volumetrics epic). Cloud platforms that aren't mesh (e.g. Cloudsdale). - **Standing on it:** the sim owns physics -- the platform is an invisible physical prim (or a mesh physics shape); the volumetric cloud is drawn around it. - **Marker convention (decide before content is made):** a specific uploaded "Slipstream volumetric cloud" texture on the prim's faces marks it. Parameters (density, softness, colour / tint, noise scale, edge falloff) packed into fields every viewer receives: colour, alpha, glow, texture repeats / offsets / rotation. Object descriptions (not sent with object updates) and custom glTF material extensions (not kept by the server) can't carry it. - **Other viewers** draw the prim with the marker texture -- design it to read as a soft cloud. - **Rendering:** prim-shaped local volume (P1) with noise; inside it, fog thickens around the camera. - **Builder docs:** how to make one, with the parameter mapping.

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2026-10-12 13:15:16 +00:00

[Epic] Volumetrics: froxel fog, volumetric sky clouds, cloud platforms, volumetric particles #722

sky_line referenced this issue