mirror of
https://github.com/eliasstepanik/big_space_with_trim.git
synced 2026-01-11 23:08:29 +00:00
9e778743e0
Migrate to the Bevy 0.15 RC. - Migrate examples - Add `with_child` to `ReferenceFrameCommands` and `SpatialEntityCommands` to match Bevy's `EntityCommands::with_child` - Add `Typed` bound to `GridPrecision` (required for `register_type`) --------- Co-authored-by: Aevyrie <aevyrie@gmail.com>
98 lines
4.2 KiB
Rust
98 lines
4.2 KiB
Rust
//! This example demonstrates error accumulating from parent to children in nested reference frames.
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use bevy::{math::DVec3, prelude::*};
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use bevy_color::palettes;
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use big_space::{commands::BigSpaceCommands, reference_frame::ReferenceFrame, FloatingOrigin};
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fn main() {
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App::new()
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.add_plugins((
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DefaultPlugins.build().disable::<TransformPlugin>(),
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// bevy_inspector_egui::quick::WorldInspectorPlugin::new(),
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big_space::BigSpacePlugin::<i64>::default(),
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big_space::camera::CameraControllerPlugin::<i64>::default(),
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big_space::debug::FloatingOriginDebugPlugin::<i64>::default(),
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))
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.add_systems(Startup, setup_scene)
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.run();
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}
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// The nearby object is NEARBY meters away from us. The distance object is DISTANT meters away from
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// us, and has a child that is DISTANT meters toward us (relative its parent) minus NEARBY meters.
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const DISTANT: DVec3 = DVec3::new(1e10, 1e10, 1e10);
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const SPHERE_RADIUS: f32 = 10.0;
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const NEARBY: Vec3 = Vec3::new(SPHERE_RADIUS * 20.0, SPHERE_RADIUS * 20.0, 0.0);
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fn setup_scene(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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let mesh_handle = meshes.add(Sphere::new(SPHERE_RADIUS).mesh());
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let matl_handle = materials.add(StandardMaterial {
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base_color: Color::srgb(0.8, 0.7, 0.6),
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..default()
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});
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commands.spawn_big_space(
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ReferenceFrame::<i64>::new(SPHERE_RADIUS * 100.0, 0.0),
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|root_frame| {
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root_frame.spawn_spatial((
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Mesh3d(mesh_handle.clone()),
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MeshMaterial3d(materials.add(Color::from(palettes::css::BLUE))),
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Transform::from_translation(NEARBY),
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));
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let parent = root_frame.frame().translation_to_grid(DISTANT);
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root_frame.with_frame(
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ReferenceFrame::new(SPHERE_RADIUS * 100.0, 0.0),
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|parent_frame| {
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// This function introduces a small amount of error, because it can only work up
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// to double precision floats. (f64).
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let child = parent_frame
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.frame()
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.translation_to_grid(-DISTANT + NEARBY.as_dvec3());
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parent_frame.insert((
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Mesh3d(mesh_handle.clone()),
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MeshMaterial3d(matl_handle.clone()),
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Transform::from_translation(parent.1),
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));
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parent_frame.insert(parent.0);
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// A green sphere that is a child of the sphere very far from the origin.
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// This child is very far from its parent, and should be located exactly at
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// the origin (if there was no floating point error). The distance from the
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// green sphere to the red sphere is the error caused by float imprecision.
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// Note that the sphere does not have any rendering artifacts, its position
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// just has a fixed error.
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parent_frame.with_child((
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Mesh3d(mesh_handle),
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MeshMaterial3d(materials.add(Color::from(palettes::css::GREEN))),
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Transform::from_translation(child.1),
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child.0,
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));
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},
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);
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root_frame.spawn_spatial((
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DirectionalLight::default(),
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Transform::from_xyz(4.0, -10.0, -4.0),
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));
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root_frame.spawn_spatial((
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Camera3d::default(),
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Transform::from_translation(NEARBY + Vec3::new(0.0, 0.0, SPHERE_RADIUS * 10.0))
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.looking_at(NEARBY, Vec3::Y),
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Projection::Perspective(PerspectiveProjection {
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near: (SPHERE_RADIUS * 0.1).min(0.1),
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..default()
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}),
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FloatingOrigin,
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big_space::camera::CameraController::default() // Built-in camera controller
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.with_speed_bounds([10e-18, 10e35])
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.with_smoothness(0.9, 0.8)
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.with_speed(1.0),
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));
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},
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);
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}
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