The parser can't handle multiple file scene descriptions, although they may be added in the future. Basic Scene Requirements Unlike some other raytracers out there, Tachyon requires that you specify most of the scene parameters in the scene description file itself. If users would rather specify some of these parameters at the command line, then I may add that feature in the future. A scene description file contains keywords, and values associated or grouped with a keyword. All keywords can be in caps, lower case, or mixed case for the convenience of the user.
All values are either character strings, or oating point numbers.
At the moment there are fourteen keywords with values, that must appear in every scene description file. There are currently no limits placed on the resolution of an output image other than the computer's available memory and reasonable execution time. The included file is opened, and processing continues as if it were part of the current file, until the end of the included file is reached. Parsing of the current file continues from where it left off prior to the included file. The Camera One of the most important parts of any scene, is the camera position and orientation.