Adobe ATMOSPHERE User Manual page 119

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ADOBE ATMOSPHERE
User Guide
Triangular Slabs have a thickness parameter in the Inspector palette.
Stairs
The Stairs primitive creates a set of stairs with a connector at each corner. The Stairs primitive is the "smartest" solid
primitive currently available in Atmosphere. An entire fl ight of stairs can be constructed as a single Stairs primitive,
by defi ning the position of only four Connectors. Basically, the Stairs primitive is constrained so that the height of a
single stair is always the same, the number of stairs increases or decreases to match the height between the top two
and the bottom two Connectors, and the top and bottom stairs encompass the distance between the two Connectors
that defi ne each of them. If you drop a Stairs primitive into the Solid Object Editor and start moving it's Connectors
around (try this from both a Top view and a Front view), this will become more apparent.