Struct SceneLights 

pub struct SceneLights {
    pub lights: [LightData; 10],
    pub num_lights: u32,
    pub sun_dir: Vec3,
    pub sun_col: Vec4,
    pub has_sun: bool,
    pub shadow_point_index: i32,
}

Point + spot + sun lights collected from the world for one frame, ready to be dropped into SceneUniforms.

Fields

lights: [LightData; 10]

Up to 10 point/spot lights (the shader’s fixed light array).

num_lights: u32

sun_dir: Vec3

Direction the sun points along (normalized). Default down-vector when the scene has no LightRole::Sun.

sun_col: Vec4

Sun colour in rgb, intensity in w. w == 0 means “no sun” — the deferred lighting shader keys off this exactly like the old inline code did.

has_sun: bool

Whether the scene actually contains a LightRole::Sun. The studio forward shader signals “sun present” through sun_direction.w (1.0 vs 0.0); this carries that bit so the studio path stays behaviourally identical.

shadow_point_index: i32

Index into lights of the point light that owns the single point-shadow cube, or -1 when there is no point light. There is only one point-shadow cubemap, so exactly one point light casts; the caller renders that light’s cube and the shader only samples it for this index (avoids applying one cube to every point light).