Hi Greg, I was experimenting with the dome parallax and needed some help understanding your sw and terminology. Reading the documentation: Left- and right-eye stereo views for dome display can be generated by specifying parallax angles of opposite signs. The views are rotated by p-angle degrees about the Y (vertical) axis through the center of the focal plane. For example, views recorded with dome parallax ±5° can be combined to give a stereo effect when viewed in the forward (−Z) direction. When you talk about p-angle it reminds me of the angle of convergence. Is that correct? In hollywood terminology they calibrate the word "parallax" to percentages. Zero parallax is on the screen, positive is behind the screen, and negative in front of the screen. +5° would be the left eye, and -5° the right? Proper usage would be +n and -n; that is symmetrical around 0? as opposed to +5° and 0°, or +4 and -2? Is the focal plane actually the dome screen? Setting the focal plane in the side view, does it actually do anything? Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine