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Ray3d::from_screenspace() implementation from Camera.viewport_to_world() #76

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Ray3d::from_screenspace() implementation from Camera.viewport_to_world() #76

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21 changes: 4 additions & 17 deletions src/primitives.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -242,23 +242,10 @@ pub mod rays {
camera: &Camera,
camera_transform: &GlobalTransform,
) -> Option<Self> {
let view = camera_transform.compute_matrix();

let (viewport_min, viewport_max) = camera.logical_viewport_rect()?;
let screen_size = camera.logical_target_size()?;
let viewport_size = viewport_max - viewport_min;
let adj_cursor_pos =
cursor_pos_screen - Vec2::new(viewport_min.x, screen_size.y - viewport_max.y);

let projection = camera.projection_matrix();
let far_ndc = projection.project_point3(Vec3::NEG_Z).z;
let near_ndc = projection.project_point3(Vec3::Z).z;
let cursor_ndc = (adj_cursor_pos / viewport_size) * 2.0 - Vec2::ONE;
let ndc_to_world: Mat4 = view * projection.inverse();
let near = ndc_to_world.project_point3(cursor_ndc.extend(near_ndc));
let far = ndc_to_world.project_point3(cursor_ndc.extend(far_ndc));
let ray_direction = far - near;
Some(Ray3d::new(near, ray_direction))
match camera.viewport_to_world(camera_transform, cursor_pos_screen) {
Some(r) => Some(Ray3d::new(r.origin, r.direction)),
None => None,
}
}

/// Checks if the ray intersects with an AABB of a mesh.
Expand Down