Hello,
I'm playing around with Extrusion and I think there is an error in file
com.sun.j3d.loaders.vrml97.impl.Extrusion,
version @(#)Extrusion.java 1.23 99/03/24 15:56:40
on line 231 there is:
crossSectionPts[i] = new Point3f(a2[0],0.0f,a2[1]);
shouldn't there be:
crossSectionPts[i] = new Point3f(a2[0],a2[1],0.0f);
That is, instead of setting the x and z coordinates of crossSectionPts[i],
the x and y coordinates should be set.
The problem occurs with the simlest extrusion, where
crossSection is [ 1 1, 1 -1, -1 -1, -1 1, 1 1 ]
and
spine is [ 0 0 0, 0 0 1 ]
With the original version I get the following coordinates:
coords
(1.0, 0.0, 1.0)
(1.0, 0.0, -1.0)
(-1.0, 0.0, -1.0)
(-1.0, 0.0, 1.0)
(1.0, 0.0, 1.0)
(1.0, 0.0, 2.0)
(1.0, 0.0, 0.0)
(-1.0, 0.0, 0.0)
(-1.0, 0.0, 2.0)
(1.0, 0.0, 2.0)
--> Values on y axis are all zero -> result is flat.
With the corrected version I get
coords
(1.0, 1.0, 0.0)
(1.0, -1.0, 0.0)
(-1.0, -1.0, 0.0)
(-1.0, 1.0, 0.0)
(1.0, 1.0, 0.0)
(1.0, 1.0, 1.0)
(1.0, -1.0, 1.0)
(-1.0, -1.0, 1.0)
(-1.0, 1.0, 1.0)
(1.0, 1.0, 1.0)
--> Result is a cube as it should be!
Pasi
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