Enum BillboardLighting 

pub enum BillboardLighting {
    FaceNormal,
    WorldUp,
    AmbientOnly,
    FullBright,
}

How a sprite/billboard instance derives its shading normal (BB.2b) — a per-instance choice that rides the sprite flags. A camera-facing billboard’s DDA face normal tracks the camera, so its N·L would shift as you orbit; WorldUp / AmbientOnly tame that. Only affects the dynamic lighting path (a disabled rig is unaffected). Set via set_sprite_instance_lighting or BillboardActorDef::lighting.

Variants

FaceNormal

The DDA hit-face normal — today’s DL.7 look (default).

WorldUp

A fixed world-up normal: stable directional shading regardless of the camera angle.

AmbientOnly

Ambient only — no sun / point-light direct term, the flattest, most Doom-faithful cutout look (still scaled by the scene’s ambient level, so it dims in a dim scene).

FullBright

Full-bright / emissive — the voxel colour at full intensity, ignoring all lighting. The right look for glows (fire, spell auras, muzzle flashes) and markers that shouldn’t darken in shadow.

Trait Implementations

impl Clone for BillboardLighting

fn clone(&self) -> BillboardLighting

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BillboardLighting

impl Debug for BillboardLighting

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for BillboardLighting

fn default() -> BillboardLighting

Returns the “default value” for a type.

impl Eq for BillboardLighting

impl PartialEq for BillboardLighting

fn eq(&self, other: &BillboardLighting) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for BillboardLighting