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Bake ambient occlusion into the geometry #82

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opened 2026-10-20 08:49:27 +00:00 by sermuns · 2 comments

sermuns commented

2026-10-20 08:49:27 +00:00

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A Soup is positions, per-face normals and UVs. There is no color channel,
and G.ambient adds the same value to every fragment, so every triangle of a
wall, slab or shell shades identically to its neighbours. Interiors, doorways and
the joints between a slab and a facade read as cardboard.

Two phases, in order:

An analytic cavity term at build time: darken vertices near floor and slab
junctions and in inward corners, and write it to a new vertex color attribute
that multiplies light in the shared fragment. This is a vertex format change
plus one term and already removes most of the flatness.
A real bake: raycast against the soup or a coarse occupancy grid and store the
result in the same channel. The bake CLI is the right place because it can
afford the time and the result is deterministic.

Vertex color also gives the geometry a place for per-vertex variation later
(weathering, room tint, snow), so it is not a one-purpose attribute.

Related: #7 owns the lighting revamp this belongs to; #79 gives the ambient it
modulates, and #81 is the outdoor variant of the same problem.

A `Soup` is positions, per-face normals and UVs. There is no color channel, and `G.ambient` adds the same value to every fragment, so every triangle of a wall, slab or shell shades identically to its neighbours. Interiors, doorways and the joints between a slab and a facade read as cardboard. Two phases, in order: 1. An analytic cavity term at build time: darken vertices near floor and slab junctions and in inward corners, and write it to a new vertex color attribute that multiplies `light` in the shared fragment. This is a vertex format change plus one term and already removes most of the flatness. 2. A real bake: raycast against the soup or a coarse occupancy grid and store the result in the same channel. The bake CLI is the right place because it can afford the time and the result is deterministic. Vertex color also gives the geometry a place for per-vertex variation later (weathering, room tint, snow), so it is not a one-purpose attribute. Related: #7 owns the lighting revamp this belongs to; #79 gives the ambient it modulates, and #81 is the outdoor variant of the same problem.

sermuns added this to the Rendering milestone

2026-10-20 08:49:27 +00:00

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2026-10-20 08:49:27 +00:00

sermuns referenced this issue

2026-10-20 08:49:38 +00:00

Let the trees cast shadows #80

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2026-10-20 08:49:41 +00:00

Get the scene depth into the post pass #88

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2026-10-20 09:23:11 +00:00

(slop) cast tree shadows and bake cavity ambient occlusion

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2026-10-20 09:23:15 +00:00

Cast tree shadows and bake cavity ambient occlusion #93

sermuns referenced this issue from a commit

2026-10-20 09:29:29 +00:00

(slop) cast tree shadows and bake cavity ambient occlusion

sermuns commented

2026-10-22 12:27:12 +00:00

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Phase 1 landed. Phase 2 has not.

The analytic cavity term is in: apply_cavity_ao darkens the vertices near the floor and slab junctions at build time and writes it into the soup, and the shared lit fragment scales the ambient by it. The same per-vertex channel also carries the baked room lamp spill, which is what the attribute was wanted for anyway.

What is missing is phase 2: a real bake, a raycast against the soup or a coarse occupancy grid, run in the bake CLI, which is where the time to afford it is.

Phase 1 landed. Phase 2 has not. The analytic cavity term is in: `apply_cavity_ao` darkens the vertices near the floor and slab junctions at build time and writes it into the soup, and the shared lit fragment scales the ambient by it. The same per-vertex channel also carries the baked room lamp spill, which is what the attribute was wanted for anyway. What is missing is phase 2: a real bake, a raycast against the soup or a coarse occupancy grid, run in the bake CLI, which is where the time to afford it is.

sermuns referenced this issue

2026-10-22 12:31:23 +00:00

Revamped lighting #7

sermuns commented

2026-10-25 02:01:30 +00:00

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Status check: unchanged. Phase 1 (apply_cavity_ao plus the ground-contact darkening, multiplied into ambient through soup.ao) is the shipped half; phase 2 — a raycast against the soup or a coarse occupancy grid in the bake CLI — is still absent from liuverse-fetch-map.

Status check: unchanged. Phase 1 (`apply_cavity_ao` plus the ground-contact darkening, multiplied into ambient through `soup.ao`) is the shipped half; phase 2 — a raycast against the soup or a coarse occupancy grid in the bake CLI — is still absent from `liuverse-fetch-map`.

sermuns referenced this issue from a commit

2026-10-25 02:28:45 +00:00

(slop) bake raycast ambient occlusion into the static scene

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

2026-10-25 02:28:51 +00:00

Bake raycast ambient occlusion into the static scene #167

sermuns referenced this issue from a commit

2026-10-25 02:32:16 +00:00

(slop) bake raycast ambient occlusion into the static scene

sermuns closed this issue

2026-10-25 02:32:26 +00:00

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