Titanfall Engine Lighting System

[snake-biscuits]

Shadows

ShadowMesh -> ShadowMeshIndex -> ShadowMeshOpaqueVertex
          \-> MaterialSort   \-> ShadowMeshAlphaVertex

Titanfall 2

ShadowEnvironment -> ShadowMesh
                 \-> CSMAABBNodes -> CSMObjReferences
                                                   
ShadowEnvironments are indexed by entities (light_environment(_volume) w/ lightEnvironmentIndex key)

CSM (Cascading Shadow Maps)

CSMAABBNode -> CSMObjReference -> ??? (starts high, out of ObjRefs range)
           \-> CSMAABBNode

LightProbe

LightProbeTree -?> LightProbeRef -> LightProbe

StaticPropLightProbeIndices & StaticProps are parallel

Titanfall 2

-?> LightProbeBSPNodes -> ???
                  \-> LightProbeBspNodes

-?> LightProbeBSPRefIds -?>

-?> LightProbeParentInfos -?>

World Lights

WorldLight -> TextureData
          \-> Entities (parent)

Titanfall 2

WorldLight -> TextureData
          \-?> WorldLightParentInfos

[snake-biscuits]

CSM must help w/ optimising real time shadows in some way
Has a node tree, might flag some meshes which cast shadows?
CSMObjRefs is a real mystery atm

Might help to get the bounds of leaves (CSMAABBNodes w/ no child Nodes / child ObjRefs)

[snake-biscuits]

LightProbeBspNodes have a plane embedded in them (not an index!)
The also appear to have 2 int32_t indices (likely front & back of plane)
-ve indices are huge and could be a bitfield?

[snake-biscuits]

>>> [n.children for n in bsp.LIGHTPROBE_BSP_NODES[:16]]
[(1, 3181), (2, 1633), (3, 753), (4, 499),
 (5, 189), (6, 129), (7, 121), (8, 60),
 (9, 59), (10, 57), (11, 54), (12, 24),
 (13, -1879048087), (14, 15),
 (-1946157056, -1744830458), (-1778384878, 16)]
>>> hex(-1879048087)
'-0x6fffff97'
>>> (-1879048087).to_bytes(4, "little", signed=True)
b'i\x00\x00\x90'  # bitfield?

>>> indices = {n.unknown[0] for n in bsp.LIGHTPROBE_BSP_NODES}.union({n.unknown[1] for n in bsp.LIGHTPROBE_BSP_NODES})
>>> indices == {*range(1, len(bsp.LIGHTPROBE_BSP_NODES))}
False
>>> indices2 = {i for i in indices if 0 < i < len(bsp.LIGHTPROBE_BSP_NODES)}
>>> indices2 == {*range(1, len(bsp.LIGHTPROBE_BSP_NODES))}
True

[snake-biscuits]

Haven't looked at WorldLight.parent yet
There's a lot of neat world light default overrides in engine.dll tho