Render a scene from the UNIX command line

Export the scene as an SDL file by selecting File > Export > SDL and entering a file name in the File Requestor. For example, type:
```
/usr/u/username/user_data/demo/sdl/filename
```
Open a UNIX shell and change the directory to that of the current project (that is, one directory above the SDL file). For example, type:
```
cd /usr/u/kozyniak/user_data/demo
```
You must be in the project directory (that is, one directory above the SDL file) when using the stand-alone renderers.
To raycast the scene, type:
```
renderer sdl/filename
```
To raytrace the scene, type:
```
raytracer sdl/filename
```
To powercast the scene, type:
```
powercaster sdl/filename
```
To powertrace the scene, type:
```
powertracer sdl/filename
```
There are several options that you can use with the stand-alone renderers (see Use a command line rendering program).

The renderer displays information on the elapsed time for each frame and for the total render.