Autodesk LIGHTSCAPE Manual page 247

Using Animation Files
Load each subsequent model and the same animation
file, then continue to define the path and speed for the
camera. Be sure to save the camera path before
loading each model.
Next, determine at which frames you need to load or
unload a particular model during the rendering
process. You can only determine this by using Play-
back mode to locate the frame at which that model
comes into view. For greater efficiency, you can also
determine the frame where the current model goes
out of view.
Finally, during the frame-creation process, you load
the required files in the Rendering dialog, then enter
the predetermined range of frames in the appropriate
boxes.
In the current version of Lightscape, there is no inter-
face for loading or unloading files at specific frames.
You can do this, however, using a batch file and the
batch rendering programs: lsrender or lsray. For more
information, see Appendix B, "Batch Processing
Utilities."
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