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_asset::Handle;
use bevy_ecs::prelude::*;
use bevy_image::Image;
use bevy_pbr::*;
use std::borrow::Cow;

pub fn scatter_layer(name: impl Into<Cow<'static, str>>) -> impl Bundle
where
{
    (
        Name::new(name),
        ScatterLayerType::<ExtendedWindAffectedMaterial>::default(),
    )
}

impl ScatterMaterial for ExtendedWindAffectedMaterial {
    fn create_material(
        base: Option<StandardMaterial>,
        noise_texture: Handle<Image>,
        properties: &ScatterAssetProperties,
    ) -> ExtendedWindAffectedMaterial {
        ExtendedMaterial {
            base: base.unwrap_or_default(),
            extension: WindAffectedExtension::new(properties, noise_texture),
        }
    }

    fn update_material(
        material: &mut ExtendedWindAffectedMaterial,
        current_wind: Wind,
        previous_wind: Wind,
        options: ScatterMaterialOptions,
    ) {
        let ext = &mut material.extension;
        if ext.current != current_wind || ext.previous != previous_wind || ext.options != options {
            ext.current = current_wind;
            ext.previous = previous_wind;
            ext.options = options;
        }
    }

    fn component(material: Handle<ExtendedWindAffectedMaterial>) -> impl Component {
        MeshMaterial3d(material)
    }

    fn spawn(cmd: &mut Commands, request: SpawnRequest<ExtendedWindAffectedMaterial>) {
        request.spawn(cmd);
    }
}