From: "� - - �n +���ng� - - �" <[EMAIL PROTECTED]>
Sent: Tuesday, December 18, 2001 10:17 AM


> i wanted to create cutomized 3D shapes and one of the things i
thought of doing is thru extrusion and lathing 2D shapes. is
that possible in java3d? how? if not, how else can i customize
my 3D shapes?

My not-ready-for-prime-time lathe and extruder allow
construction of a (plane) polygon, then use those line segments
to generate triangle strip arrays.  The ends of extrusions and
partial arcs get closed with TrangleFanArrays made from the
(convex) polygons.

This approach is practical, I think, only for some limited
cases.  It takes some fiddling to control the vertex count for
lathe parts that have large ratios of outer to inner diameters,
for example.  Similarly, if a polygon section combines a few
simple lines with contorted shapes, the resulting mesh isn't
particularly pretty.

Fred Klingener
Brock Enginering

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