So you’ve ordered a Kinect for Xmas. How original ! Maybe it is about time to check this _1024_KinectPrimitivePoint experimental QCplugin. It will actually convert a Depth image into a vertex array of GLpoints. The kewl thing is that you have a few options to fiddle with Z amplitude, offset, and of course Zmin/Zmax, so you won’t have to bother with filtering your image in the first place.
Example included, note that you don’t have to own a Kinect or even install the KnM Kinect plugin (which is damn cool btw) for the example to run.
Plugin is still experimental, and a bit slow, but has an extra option to add some noise to your 3d points. Great to dissolve the data in a chaotic way.
10.5/10.6 universal. Download from the box.