Struct DdaEnv 

pub struct DdaEnv<'a> {
    pub sky: Option<&'a Sky>,
    pub fog_color: u32,
    pub fog_max_dist: f32,
    pub side_shades: [i8; 6],
    pub materials: Option<&'a MaterialTable>,
    pub terrain_materials: &'a [(u32, u8)],
}

Per-frame environment for DDA shading (Substage DDA.5): a textured sky panorama, distance fog, and per-face side shading.

DdaEnv::default disables all three — flat baked-brightness hits and a caller-pre-filled solid sky — so the brickmap/dense equivalence tests run against an unchanged pipeline.

Fields

sky: Option<&'a Sky>

Textured sky sampled per-ray-direction on a miss. None leaves the destination untouched (caller’s solid sky pre-fill shows).

fog_color: u32

Fog target colour (0x__RRGGBB); hits blend toward it with distance. Typically the sky colour so terrain fades into the sky.

fog_max_dist: f32

Depth at which fog is fully opaque. <= 0 disables fog.

side_shades: [i8; 6]

Per-face brightness reduction [x-, x+, y-, y+, z-, z+], applied to the hit face (voxlap setsideshades). All-zero = off.

materials: Option<&'a MaterialTable>

TV: global voxel-material palette (id → opacity + blend mode). None keeps terrain fully opaque (the first-hit path, bit-identical).

terrain_materials: &'a [(u32, u8)]

TV: terrain colour→material map ((rgb, material_id)). A hit voxel’s colour is looked up here for its material. Empty (the default) ⇒ every voxel is opaque, so the march returns the first hit unchanged.

Trait Implementations

impl<'a> Clone for DdaEnv<'a>

fn clone(&self) -> DdaEnv<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Copy for DdaEnv<'a>

impl Default for DdaEnv<'_>

fn default() -> Self

Returns the “default value” for a type.