Function render_scene_composed_with_materials 

pub fn render_scene_composed_with_materials(
    fb: &mut [u32],
    zb: &mut [f32],
    pitch_pixels: usize,
    width: u32,
    height: u32,
    fog: CpuFog,
    scene: &mut Scene,
    camera: &Camera,
    settings: &OpticastSettings,
    sky_color: u32,
    sky: Option<&Sky>,
    materials: Option<&MaterialTable>,
    terrain_materials: &[(u32, u8)],
    lights: CpuLights<'_>,
    sprite_occluder: Option<&dyn WorldOccluder>,
) -> RenderOutcome

render_scene_composed with TV terrain materials: materials is the global palette and terrain_materials the colour→material map; together they make matching-colour terrain voxels translucent (front-to-back composited). An empty map / None palette renders identically to render_scene_composed.