87 lines
2.2 KiB
Rust
87 lines
2.2 KiB
Rust
use bevy::prelude::*;
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use bevy::render::camera::{Camera, CameraProjection};
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use bevy::render::view::visibility::*;
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use bevy::render::primitives::Frustum;
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use bevy::render::view::VisibleEntities;
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use bevy::math::Mat4;
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use crate::screeninfo::ScreenInfo;
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use crate::viewer::*;
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use crate::projection::*;
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#[derive(Component, Debug, Clone, Reflect)]
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#[reflect(Component, Default)]
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pub struct OffAxisProjection {
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pub far: f32,
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pub projection_matrix: Mat4
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}
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impl CameraProjection for OffAxisProjection {
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fn get_projection_matrix(&self) -> Mat4 {
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self.projection_matrix
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}
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// what to do on window resize
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fn update(&mut self, width: f32, height: f32) {
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// extract sx and sy from matrix
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// let sx = self.projection_matrix.x_axis.x;
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// let sy = self.projection_matrix.y_axis.y;
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}
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fn far(&self) -> f32 {
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self.far
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}
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}
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impl Default for OffAxisProjection {
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fn default() -> Self {
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Self {
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far: 1000.0,
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projection_matrix: make_projection_rh_custom(
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45.0f32.to_radians(),
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1.3f32,
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1.0,
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1000.0)
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}
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}
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}
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pub fn offaxis_camera_setup(mut commands: Commands) {
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let projection = OffAxisProjection::default();
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// let projection = PerspectiveProjection::default();
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// position the camera like bevy would do by default for 2D:
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let transform = Transform::from_xyz(0.0, 0.0, 0.1);
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// frustum construction code copied from Bevy
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let view_projection = projection.get_projection_matrix() * transform.compute_matrix().inverse();
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let frustum = Frustum::from_view_projection(
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&view_projection,
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&transform.translation,
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&transform.back(),
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projection.far,
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);
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commands.spawn((
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bevy::render::camera::CameraRenderGraph::new(bevy::core_pipeline::core_3d::graph::NAME),
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projection,
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frustum,
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NoFrustumCulling,
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transform,
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GlobalTransform::default(),
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VisibleEntities::default(),
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Camera::default(),
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Camera3d::default(),
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ScreenInfo::new("Test"),
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Viewer::new(transform.translation)
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));
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}
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