Volumetrics P1: froxel volumetric fog + local volume primitives #718

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opened 2026-10-12 13:15:15 +00:00 by sky_line · 1 comment

sky_line commented

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

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Part of #722 (volumetrics epic).

The foundation every other phase uses.

Froxel grid: camera-aligned 3D grid (~160x90x64). Density from all sources (global height fog, haze, local volumes, later particles) is injected, lit once per cell (sun with shadow maps / RT mask, local lights), and integrated front to back; the result is applied to opaque and transparent surfaces.
Local volume primitives: boxes / ellipsoids with noise-shaped density, injected into the grid; close up, raymarched directly over the screen tiles they cover for detail.
Shared lighting + denoise: our own temporal reprojection and denoise (never relying on TAA / FSR for convergence).
Integration: atmosphere / haze, water, the existing godrays pass.
GPU-driven compute, async compute where possible; quality setting (grid resolution, steps); budgeted cost (~0.5 ms target on mid-range GPUs).

Part of #722 (volumetrics epic). The foundation every other phase uses. - **Froxel grid:** camera-aligned 3D grid (~160x90x64). Density from all sources (global height fog, haze, local volumes, later particles) is injected, lit once per cell (sun with shadow maps / RT mask, local lights), and integrated front to back; the result is applied to opaque and transparent surfaces. - **Local volume primitives:** boxes / ellipsoids with noise-shaped density, injected into the grid; close up, raymarched directly over the screen tiles they cover for detail. - **Shared lighting + denoise:** our own temporal reprojection and denoise (never relying on TAA / FSR for convergence). - **Integration:** atmosphere / haze, water, the existing godrays pass. - GPU-driven compute, async compute where possible; quality setting (grid resolution, steps); budgeted cost (~0.5 ms target on mid-range GPUs).

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

sky_line added this to the Slipstream project

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

sky_line referenced this issue

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