Delay in updating camera rays for a raytracer

[naive horizon]

Hi, I've been struggling with a bug in my rendering where my uniform for generating rays through each pixel of the screen is falling out of sync with the view of the camera (Fig 1).

In the main world, after TransformPropogate, I'm creating a uniform of three vectors which allow me to transform a pixel's position in device coordinates into a direction in world space (Fig 2, Fig 3, Fig 4). I then run a fullscreen tonemapping pass which uses the rays to calculate intersections with a cube at (0,0,0) (Fig 5).

I've tried it with both the unsmoothed pan-orbit camera and a custom first person camera to make sure the problem is still present, as well as without change detection. Any ideas on why the ray uniform might be falling behind the camera view would be greatly appreciated 🙂

Actually, I'm running into the same problem calculating the rays from the view uniform directly so I suspect there's a desync with the view uniform itself 😦

[uneven cedar]

I'm new to Bevy, but this resource suggests you might need to change the Update into a PostUpdate:
https://bevy-cheatbook.github.io/fundamentals/transforms.html#transform-propagation

Unsure if what you have would functionally mean the same though since you have the after. But it could just mean that it will happen on the next Update tick instead of after the PostUpdate with transform propagation.