mirror of
https://github.com/bevyengine/bevy
synced 2024-11-10 07:04:33 +00:00
2bd328220b
# Objective Fixes #15791. As raised in #11022, scaling orthographic cameras is confusing! In Bevy 0.14, there were multiple completely redundant ways to do this, and no clear guidance on which to use. As a result, #15075 removed the `scale` field from `OrthographicProjection` completely, solving the redundancy issue. However, this resulted in an unintuitive API and a painful migration, as discussed in #15791. Users simply want to change a single parameter to zoom, rather than deal with the irrelevant details of how the camera is being scaled. ## Solution This PR reverts #15075, and takes an alternate, more nuanced approach to the redundancy problem. `ScalingMode::WindowSize` was by far the biggest offender. This was the default variant, and stored a float that was *fully* redundant to setting `scale`. All of the other variants contained meaningful semantic information and had an intuitive scale. I could have made these unitless, storing an aspect ratio, but this would have been a worse API and resulted in a pointlessly painful migration. In the course of this work I've also: - improved the documentation to explain that you should just set `scale` to zoom cameras - swapped to named fields for all of the variants in `ScalingMode` for more clarity about the parameter meanings - substantially improved the `projection_zoom` example - removed the footgunny `Mul` and `Div` impls for `ScalingMode`, especially since these no longer have the intended effect on `ScalingMode::WindowSize`. - removed a rounding step because this is now redundant 🎉 ## Testing I've tested these changes as part of my work in the `projection_zoom` example, and things seem to work fine. ## Migration Guide `ScalingMode` has been refactored for clarity, especially on how to zoom orthographic cameras and their projections: - `ScalingMode::WindowSize` no longer stores a float, and acts as if its value was 1. Divide your camera's scale by any previous value to achieve identical results. - `ScalingMode::FixedVertical` and `FixedHorizontal` now use named fields. --------- Co-authored-by: MiniaczQ <xnetroidpl@gmail.com>
59 lines
1.9 KiB
Rust
59 lines
1.9 KiB
Rust
//! Shows how to create a 3D orthographic view (for isometric-look games or CAD applications).
|
|
|
|
use bevy::{prelude::*, render::camera::ScalingMode};
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup)
|
|
.run();
|
|
}
|
|
|
|
/// set up a simple 3D scene
|
|
fn setup(
|
|
mut commands: Commands,
|
|
mut meshes: ResMut<Assets<Mesh>>,
|
|
mut materials: ResMut<Assets<StandardMaterial>>,
|
|
) {
|
|
// camera
|
|
commands.spawn((
|
|
Camera3d::default(),
|
|
Projection::from(OrthographicProjection {
|
|
// 6 world units per pixel of window height.
|
|
scaling_mode: ScalingMode::FixedVertical {
|
|
viewport_height: 6.0,
|
|
},
|
|
..OrthographicProjection::default_3d()
|
|
}),
|
|
Transform::from_xyz(5.0, 5.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
|
|
));
|
|
|
|
// plane
|
|
commands.spawn((
|
|
Mesh3d(meshes.add(Plane3d::default().mesh().size(5.0, 5.0))),
|
|
MeshMaterial3d(materials.add(Color::srgb(0.3, 0.5, 0.3))),
|
|
));
|
|
// cubes
|
|
commands.spawn((
|
|
Mesh3d(meshes.add(Cuboid::default())),
|
|
MeshMaterial3d(materials.add(Color::srgb(0.8, 0.7, 0.6))),
|
|
Transform::from_xyz(1.5, 0.5, 1.5),
|
|
));
|
|
commands.spawn((
|
|
Mesh3d(meshes.add(Cuboid::default())),
|
|
MeshMaterial3d(materials.add(Color::srgb(0.8, 0.7, 0.6))),
|
|
Transform::from_xyz(1.5, 0.5, -1.5),
|
|
));
|
|
commands.spawn((
|
|
Mesh3d(meshes.add(Cuboid::default())),
|
|
MeshMaterial3d(materials.add(Color::srgb(0.8, 0.7, 0.6))),
|
|
Transform::from_xyz(-1.5, 0.5, 1.5),
|
|
));
|
|
commands.spawn((
|
|
Mesh3d(meshes.add(Cuboid::default())),
|
|
MeshMaterial3d(materials.add(Color::srgb(0.8, 0.7, 0.6))),
|
|
Transform::from_xyz(-1.5, 0.5, -1.5),
|
|
));
|
|
// light
|
|
commands.spawn((PointLight::default(), Transform::from_xyz(3.0, 8.0, 5.0)));
|
|
}
|