Does anyone know of some sample code in C (not C++) along the lines of the Java/Processing code used in the projects given in "Making Things See"?
Haven't tried this myself, but here's something I found: https://github.com/OpenNI/OpenNI/blob/master/Samples/NiCRead/NiCRead.c
Apparently it's the same thing as NiSimpleRead, but I'm not sure if that's what you want.