Rendering with Rutt Etra is producing the same behavior. When in grayscale, all the “on” values are outputting 1 (white), and everything else is black. If using XYZ as RGB mode, there are more colors, but the depth data is still the same (uniformly blue for anything that’s “on” in the depth image).
Re: graphics card – I’ve been using the same machine, and I’ve previously been able to get great depth data out of it (easier to work with/smoother than Kineme’s, etc.), so I was sad to discover this not working :/