bevy-aabb-instancing 0.1.0

Render millions of AABB instances in Bevy.
Documentation 
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use crate::CuboidInstances;

use bevy::{
    prelude::*,
    render::{
        primitives::Aabb,
        view::{ComputedVisibility, Visibility},
    },
};

/// The components needed to render [`CuboidInstances`].
#[derive(Bundle)]
pub struct CuboidInstancesBundle {
    /// A mesh created from [`CubeMesh`].
    pub cube_mesh: Handle<Mesh>,
    /// The instances of `cube_mesh` to be rendered.
    pub instances: CuboidInstances,
    /// An [`Aabb`] that bounds all `instances`.
    pub aabb: Aabb,
    pub transform: Transform,
    pub global_transform: GlobalTransform,
    pub visibility: Visibility,
    pub computed_visibility: ComputedVisibility,
}

impl CuboidInstancesBundle {
    /// Use the `Res<CubeMesh>` resource created by [`InstancingRenderPlugin`](crate::InstancingRenderPlugin) to access a
    /// compatible `cube_mesh` handle.
    pub fn new(instances: CuboidInstances, cube_mesh: Handle<Mesh>) -> Self {
        let aabb = instances.aabb.clone();
        Self {
            instances,
            cube_mesh,
            aabb,
            transform: Default::default(),
            global_transform: Default::default(),
            visibility: Default::default(),
            computed_visibility: Default::default(),
        }
    }
}

/// A cube mesh that can be acccessed through `Res<CubeMesh>` while creating a [`CuboidInstancesBundle`].
#[derive(Clone, Debug)]
pub struct CubeMesh {
    handle: Handle<Mesh>,
}

impl CubeMesh {
    pub fn new(meshes: &mut Assets<Mesh>) -> Self {
        let cube = shape::Box {
            min_x: 0.0,
            max_x: 1.0,
            min_y: 0.0,
            max_y: 1.0,
            min_z: 0.0,
            max_z: 1.0,
        };
        Self {
            handle: meshes.add(Mesh::from(cube)),
        }
    }

    pub fn handle(&self) -> &Handle<Mesh> {
        &self.handle
    }
}