bevy/examples/3d/spawner.rs

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use bevy::{
diagnostic::{FrameTimeDiagnosticsPlugin, PrintDiagnosticsPlugin},
prelude::*,
};
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use rand::{rngs::StdRng, Rng, SeedableRng};
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fn main() {
App::build()
.add_default_plugins()
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.add_plugin(FrameTimeDiagnosticsPlugin::default())
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.add_plugin(PrintDiagnosticsPlugin::default())
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.add_startup_system(setup.system())
.add_system(move_cubes.system())
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.run();
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}
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fn move_cubes(
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time: Res<Time>,
mut materials: ResMut<Assets<StandardMaterial>>,
mut translation: ComMut<Translation>,
material_handle: Com<Handle<StandardMaterial>>,
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) {
let material = materials.get_mut(&material_handle).unwrap();
translation.0 += math::vec3(1.0, 0.0, 0.0) * time.delta_seconds;
material.albedo += Color::rgb(-time.delta_seconds, -time.delta_seconds, time.delta_seconds);
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}
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fn setup(
command_buffer: &mut CommandBuffer,
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mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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let cube_handle = meshes.add(Mesh::from(shape::Cube { size: 1.0 }));
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let plane_handle = meshes.add(Mesh::from(shape::Plane { size: 10.0 }));
let cube_material_handle = materials.add(StandardMaterial {
albedo: Color::rgb(0.5, 0.4, 0.3),
..Default::default()
});
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let plane_material_handle = materials.add(StandardMaterial {
albedo: Color::rgb(0.1, 0.2, 0.1),
..Default::default()
});
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let mut builder = command_buffer.build();
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builder
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// plane
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.add_entity(MeshEntity {
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mesh: plane_handle,
material: plane_material_handle,
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..Default::default()
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})
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// cube
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.add_entity(MeshEntity {
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mesh: cube_handle,
material: cube_material_handle,
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translation: Translation::new(0.0, 0.0, 1.0),
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..Default::default()
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})
// light
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.add_entity(LightEntity {
translation: Translation::new(4.0, -4.0, 5.0),
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..Default::default()
})
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// camera
.add_entity(PerspectiveCameraEntity {
transform: Transform::new_sync_disabled(Mat4::face_toward(
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Vec3::new(3.0, 8.0, 5.0),
Vec3::new(0.0, 0.0, 0.0),
Vec3::new(0.0, 0.0, 1.0),
)),
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..Default::default()
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});
let mut rng = StdRng::from_entropy();
for _ in 0..10000 {
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let spawned_material_handle = materials.add(StandardMaterial {
albedo: Color::rgb(
rng.gen_range(0.0, 1.0),
rng.gen_range(0.0, 1.0),
rng.gen_range(0.0, 1.0),
),
..Default::default()
});
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builder.add_entity(MeshEntity {
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mesh: cube_handle,
material: spawned_material_handle,
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translation: Translation::new(
rng.gen_range(-50.0, 50.0),
rng.gen_range(-50.0, 50.0),
0.0,
),
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..Default::default()
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});
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}
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}