Level materials and transparency

A level part’s glTF has 1,534 materials in total across the 159 parts; every one is OPAQUE. Proven · STUNTBOOST They fall into three kinds. Observed · STUNTBOOST

Kind	Content	Confidence
bake material	the base colour texture is the baked atlas (Bake<N>_Denoised, lighting baked in); the KHR_materials_specular colour texture is the bake’s direct-light mask, not a specular colour (baked lighting)	Observed · STUNTBOOST
physics material	a name beginning C_, on collision geometry only (collision); 1,099 of the 1,534 materials are physics materials (28 distinct names), the other 435 are bake and prop materials	Observed · STUNTBOOST
prop material	an ordinary glTF material of a model; emissive strength in 26 parts (KHR_materials_emissive_strength)	Observed · STUNTBOOST

Textures are sampled with the glTF samplers: each part has a sampler with nearest magnification and nearest-mipmap-linear minification (9728 and 9984; 159 samplers over the 159 parts), and 3 further samplers are linear (9729 and 9987). Proven · STUNTBOOST No sampler states wrap modes, which for glTF means repeat. Proven · STUNTBOOST The images are separate files (textures).

Transparent nodes

A node whose name contains Transparent is drawn sorted back to front. 870 nodes do over all levels. Observed · STUNTBOOST The call Transparent(a) (SE.Transparent) makes a transparent entity with alpha a:

• Its draw multiplies the shader’s Color constant (register c25, all four channels, times the albedo and the vertex colour) by a and turns diffuse lighting off. Observed · STUNTBOOST
• Only a < 1 goes to the back-to-front transparency batch. A node with a ≥ 1 is drawn at once, opaque, a times brighter. Observed · STUNTBOOST
• The one node with a > 1 in the shipped data is hang_sack=Transparent(1.5), in 18 levels, drawn with the room’s bake material. Observed · STUNTBOOST

The Transparent call is on 619 nodes as the first class; related props are CDCaseTransparent, CassetteCaseTransparent and TransparentBowl. Observed · STUNTBOOST

Shadows

A BackfaceShadowCaster() mesh (every room’s ceiling°=BackfaceShadowCaster()) is drawn only into the static shadows, never visibly. Observed · STUNTBOOST A * node casts into the bake without being baked to; a ° node is invisible in the bake (node names). Sourced · StuntboostTools