Running Ygdrasil ScenesMany CAVE environments are created as single, standalone programs (like the crayoland demo). A program like this is called a CAVE App, short for application. Ygdrasil is an interpreter program that creates an environment from a text file, called a scene file. The scene file is written in the Ygdrasil language, a unique markup language with some similarities to languages like VRML or HTML.
Example ScenesYgdrasil comes with a few example scenes, which demonstrate different YG features.
- open a shell
- go into the system yg directory:
$ cd /usr/local/yg
this is where the yg application is.
- look at what's in there:
"examples" is a directory that contains example scenes. To see what's in there, you can say:
$ ls bergen bin bin.linux bin.sgi data dso.linux dso.sgi examples modules README repeater RUN src
$ ls examples
- Run an example scene
the file RUN is a script that runs the YG interpreter, sets up preferences, and tells it what scene file to load.
$ ./RUN waves.scene
you should get a bunch of stuff in the termninal, and a window with waves and a robotic claw-like thing. Try moving around and clicking the mouse buttons. To quit, press ESC. You can also click back into the terminal, and press CTRL-C.
- You must quit YG before running another scene.
- If you make changes to a scene, you have to quit YG and run it again to see the changes take effect.
- You can't do anything else in the terminal window while YG is running.
- Depending on how your shell preferences are set up, you may be able to say "RUN waves.scene" instead of "./RUN waves.scene". ./RUN is a very specific way of saying "look for the program RUN in the current directory.
(c) Ben Chang