Global illumination and environment data

GIDynResource describes the geometry and visibility inputs for dynamic global illumination, rather than a ready-to-display set of baked probe colours. Its update shaders relight surface samples and accumulate probe radiance. Observed · GI update shader disassembly Inferred · complete relighting interpretation

Spatial organization

The GIDynResource storage page describes its serialized framing and four streams.

USNAT’s base forge has one GIDyn_<n> resource for each of the 16,384 cells of its 128×128 grid. Patch copies cover changed cells. The sampled resource’s position offset is the cell centre, and its half-float probe coordinates are relative offsets in metres. Observed · complete base index and sampled resources

The inspected one-volume/one-box profile has a voxel-to-probe grid, probe positions, encoded sample data and encoded directional data. Reading 418 bodies establishes this profile’s framing and length relations; it does not establish that every GI resource uses only that profile. Observed · 418 bodies

The low 15 bits of a nonempty voxel-grid word identify a probe; 0xFFFF marks none. The high flag bit’s meaning is unresolved. Voxel index bounds are not sufficient evidence for a guessed voxel-to-world transform. Observed · grid values and bounds Unknown · flag and full grid transform

Lighting update

Static reading of GIDynUpdateSample, UpdateProbe, UpdateSky and UpdateVolume shows surface-sample lighting from the sun, shadow comparisons, a previous-volume bounce term and packed RGB565 albedo. Probe updates project directional radiance to first-order spherical harmonics: four coefficients per colour, twelve floats per probe. Observed · update programs

The sky direction set has 192 Fibonacci-sphere directions: z=1-(2*i+1)/192, phi=i*.618034*2*pi. Probe updates read sample-or-sky indices for these directions, and the volume update uses the voxel-to-probe grid. Complete directional-table decoding and the exact GPU texture construction are unresolved. Observed · shader arithmetic Unknown · complete table and GPU construction

World maps and cubes

World holds references to SkyVisibility and TransferSH0–3. The transfer maps include an unsigned BC6H base term and signed BC6H higher terms. Their interpretation as terrain sky visibility and low-order SH transfer is supported by names and coherent map content, rather than an executed complete ambient-light path. Observed · references and decoded content Inferred · transfer interpretation

WorldAmbiance selects the environment cube for a look. All 17 examined BC6H cubes are referenced by at least one WorldAmbiance; they are global ambiance resources rather than a list of placed local probe entities. Region and weather names describe their intended looks, but the exact reflection/ambient selection beyond those references remains unresolved. Observed · all cube-reference joins Unknown · full lighting use

How does stored visibility become irradiance?

Sample decoding, the directional-table remainder, grid flags and the complete resource-to-GPU construction are not all established. No baked irradiance values can be claimed merely by decoding probe positions. Unknown

Shaun White Skateboarding

only in SWS

The static world of Shaun White Skateboarding is lit by baked data, not by the stored omni and spot lights. Three stored kinds of baked data take part. Observed · SWS[level 01 and the shader sources]

Class	Id	Size	Holds
LightMapData	0xAA9C9CB4	75 bytes	A reference to a light-map texture named LMP_ColLightMapTexture* (BC3, one mip)
VertexLightData	0x37542FA0	71 bytes	Per-instance baked vertex colours, held with the placement’s mesh instance data (class 0x536E963B), in a block of class 0x4368101B: a header of nine u32, then 4 bytes per vertex
CompositeLightingStaticComponent	0x95DC9CD6	variable	Seven float4 of spherical-harmonic coefficients, a direction and two float4 for the uninfluenced state

The class ids equal the CRC-32 of the class names LightMapData, VertexLightData and CompositeLightingStaticComponent. Proven · computed from the names

A stored baked value is decoded as value · scale + bias, with the pair stored in a StaticColorModification object (class 0x40F951DA) as the bias float4 followed by the scale float4. The bias equals the level’s sky ambient colour in all six levels: 70, 70, 70, 90, 70 and 50 of 255 for levels 01 to 06 (0.2745, 0.2745, 0.2745, 0.3529, 0.2745, 0.1961). Observed · all six levels

The shader permutations for the generic effect are named STATIC_LIGHTMAP, STATIC_VERTEXLIGHTING (the per-instance colour stream) and COMPOSITELIGHTING (the spherical harmonics plus ambient). The attenuation function for omni lights is compiled in only for the tool build. Observed

Stored local lights therefore do not reach dark places: in the level 05 tunnel the nearest omni light is 24.8 m from the spot and has a range of 25 m, and in level 06 the 16 lights are at least 150 m away. A black box mesh (05A_CoridorBlackBox01, material Gen_Black_Mat) faces inward around the tunnel, so the darkness is authored. Observed · levels 05 and 06