Merge pull request #22 from SafariMonkey/frustum-corners

Implement get_frustum_corners

src/xr_input/xr_camera.rs

@@ -1,6 +1,7 @@
 use crate::xr_input::{QuatConv, Vec3Conv};
 use crate::{LEFT_XR_TEXTURE_HANDLE, RIGHT_XR_TEXTURE_HANDLE};
 use bevy::core_pipeline::tonemapping::{DebandDither, Tonemapping};
+use bevy::math::Vec3A;
 use bevy::prelude::*;
 use bevy::render::camera::{CameraProjection, CameraRenderGraph, RenderTarget};
 use bevy::render::primitives::Frustum;
@@ -216,6 +217,26 @@ impl CameraProjection for XRProjection {
  fn far(&self) -> f32 {
  self.far
  }
+
+ fn get_frustum_corners(&self, z_near: f32, z_far: f32) -> [Vec3A; 8] {
+ let tan_angle_left = self.fov.angle_left.tan();
+ let tan_angle_right = self.fov.angle_right.tan();
+
+ let tan_angle_bottom = self.fov.angle_down.tan();
+ let tan_angle_top = self.fov.angle_up.tan();
+
+ // NOTE: These vertices are in the specific order required by [`calculate_cascade`].
+ [
+ Vec3A::new(tan_angle_right, tan_angle_bottom, 1.0) * z_near, // bottom right
+ Vec3A::new(tan_angle_right, tan_angle_top, 1.0) * z_near, // top right
+ Vec3A::new(tan_angle_left, tan_angle_top, 1.0) * z_near, // top left
+ Vec3A::new(tan_angle_left, tan_angle_bottom, 1.0) * z_near, // bottom left
+ Vec3A::new(tan_angle_right, tan_angle_bottom, 1.0) * z_far, // bottom right
+ Vec3A::new(tan_angle_right, tan_angle_top, 1.0) * z_far, // top right
+ Vec3A::new(tan_angle_left, tan_angle_top, 1.0) * z_far, // top left
+ Vec3A::new(tan_angle_left, tan_angle_bottom, 1.0) * z_far, // bottom left
+ ]
+ }
 }
 
 pub fn xr_camera_head_sync(