I am trying to write some python scripts relating to volume viewer. two things I need to have are: 1) the ability to figure out what dataset is active on the volume viewer. I will manually pick that with the mouse, my python sw will process the active model in volume viewer. 2) on the selected dataset I need to know what the min/max values are. In a unrelated problem: lately I completely avoid changing the camera scale value, I always want it to be 1.0. The mouse scroll wheel changes the scale value, so I am having accidental changes to camera scale values. How do I halt wheel commands from changing scale? under preferences/mouse I have "use mouse scroll wheel" set to false. side note: I just bought a logitech G600 mouse which has 12 buttons on the mouse that can be programmed through mode (3) and shift(2) buttons to have 12*3*2 active buttons that I can set to accelerator commands. So one of my modes will be dedicated to volume viewer controls, another for stereo/dome/camera, the other is general chimera commands. Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine