bevy_feronia 0.8.2

Foliage/grass scattering tools and wind simulation shaders/materials that prioritize visual fidelity/artistic freedom, a declarative api and modularity.
Documentation 
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use crate::prelude::*;
use bevy_ecs::prelude::*;
use bevy_utils::default;

#[cfg(feature = "trace")]
use tracing::warn;

pub fn clear_scatter_roots(
    mut cmd: Commands,
    mut mr_clear_root: MessageReader<ClearScatterRoot>,
    mut mw_clear_layers: MessageWriter<ClearScatterLayer>,
    q_root: Query<(Entity, &ScatterRoot, &ScatterOccupancyMap)>,
) {
    let layers = mr_clear_root
        .read()
        .filter_map(|root| {
            q_root
                .get(**root)
                .inspect_err(|_| {
                    #[cfg(feature = "trace")]
                    warn!(
                        "No `ScatterRoot` found for root entity {:?}. Skipping.",
                        root
                    );
                })
                .map(|(root, layers, occ_map)| {
                    cmd.entity(root).insert(ScatterOccupancyMap {
                        cell_size: occ_map.cell_size,
                        ..default()
                    });
                    layers.iter()
                })
                .ok()
        })
        .flatten();

    mw_clear_layers.write_batch(layers.map(ClearScatterLayer));
}