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build
The Gravity Builder was developed to enable the easy
construction, in Opensim immersive worlds, of staircases,
ramps etc. which need to follow a slope.  As the ball rolls
down a track (or a hillside) it rezzes prim's or linksets
along the way.  It includes a number of options, including
complex smoothing, step separation and many others.  It
is free to use or modify and you can get a copy at the
OSGRID, Wright Plaza Freebie Mall.  Or, for use on your
own grids, as an IAR file here