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parent_opacities

lumen_core::render_world

Function parent_opacities 

Source 
pub fn parent_opacities(
    main: &mut World,
    parents: &HashMap<Entity, Entity>,
) -> HashMap<Entity, f32>
Expand description

Returns each entity’s cumulative ANCESTOR opacity product (own Opacity excluded - extract fns already fold that in). CSS semantics: opacity multiplies down the subtree, so fading a dialog root fades every descendant. Returns an empty map when no entity carries an Opacity (the overwhelmingly common case - extracts then skip the lookup entirely).