Function bevy_sprite::extract_materials_2d

pub fn extract_materials_2d<M: Material2d>(
    commands: Commands<'_, '_>,
    events: Extract<'_, '_, EventReader<'_, '_, AssetEvent<M>>>,
    assets: Extract<'_, '_, Res<'_, Assets<M>>>
)

This system extracts all created or modified assets of the corresponding Material2d type into the “render world”.