> Date: Thu, 6 Jun 2002 04:59:28 -0600 > From: Raul Rios <[EMAIL PROTECTED]> > > I'm getting a bit confused when reading > the Java3D API documentation about the class > "View"... > > What are the differences between the physical and > the virtual world (or physical and virtual coordinates) ?
For most Java 3D programming you won't need to know much about physical coordinates. About the only place it comes up for most people is in the policies for the front and back clip planes, which unfortunately default to PHYSICAL_EYE. If you set these policies to VIRTUAL_EYE you can pretty much just operate in the virtual world space. Physical coordinates relate to objects in the physical world such as screens and the position of the user's eyes. For most viewing applications the correspondence between the physical and virtual world does not need to be exact. For instance, Java 3D assumes that the pixel density of a screen is 90 pixels/inch to get the physical screen and window sizes for its viewing computations. The correspondence is mostly only critical for virtual reality applications, where an accurate calibration between the display devices and the user position is needed to create the sense of immersion. If this is what you're interested in, then you will need a good understanding of physical coordinates. If you have more specific questions just let us know. -- Mark Hood =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
