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The conventional suffix for SPHERE
files is `.sph'.
SPHERE Radius Xcenter Ycenter Zcenter |
Sphere objects are drawn using rational Bezier patches, which are diced into
meshes; their smoothness, and the time taken to draw them, depends on the
setting of the dicing level, 10x10 by default.
From Geomview, the Appearance panel, the <N>ad
keyboard command, or
a dice nu nv
Appearance attribute sets this.