Autodesk LIGHTSCAPE, Manual

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File Types
This appendix describes the file types and filename extensions used in
Lightscape.
Animation File (.la)
Stores the animation keyframes and motion data
defined in the animation menus.
Block Library File (.blk)
Stores a collection of Lightscape blocks. The blocks
may represent geometric objects or luminaires. You
can import these blocks and luminaires into any
Lightscape model (Preparation file only).
Layer State File (.lay)
Stores the state (on, off, or current) of each layer in a
model. You can load this file to reset the layers to the
saved states.
Material Library File (.atr)
Stores a collection of Lightscape materials. You can
import these materials into any Lightscape model
(Preparation and Solution files).
Material Map File (.mm)
Stores a mapping (correspondence) between the 256
colors supported by DXF and Lightscape materials.
You can specify a material map file when loading a
DXF file. If you do, Lightscape automatically assigns
to surfaces the Lightscape material associated with
their color index.
Parameters File (.df)
Stores the parameters that control the processing of a
radiosity solution and the display of the results. You
can load this file to reset the saved parameter values.
Preparation and Solution files also save these param-
eter values.
Preparation File (.lp)
Stores all the basic geometric, material, and lighting
data required to run a radiosity solution in ASCII
format. The file structure is very similar to the DXF
format, but is Lightscape proprietary.