sceneDepth vignetting

Deathrey - I believe you, but I don’t understand - could you help explain it better than Epic?

“The PixelDepth expression outputs the depth, or distance from the camera, of the pixel currently being rendered… The SceneDepth expression… is similar…”

This doc makes it sound like Scene Depth relates the pixel to the camera, but I’m totally open to my reading being wrong or another take. I don’t understand exactly what is meant by a “Z axis coordinate of the pixel in view space” versus a camera-based depth to a World Space coordinate, and I expect the difference is important to troubleshoot certain problems.

Google isn’t helping much - some otherwise helpful blogs and videos treat Scene Depth like a depth from camera shortcut, but I’m wary - from what I’ve read around this site, you seem very proficient, so thought I’d ask if you have time to explain.