SPHIGS Version 1.0 --- RELEASED  8 Mar 1993

- fixed compose() confusion
- change to column matrix convention
- FillArea rendering (both sides)
- Proper z-ordering of mixed solid/non-solid objects
- SPH_copyStructure()
- Multiple point light sources
- FLAT shading
- Name Sets for visibility
- Pick Correlation extensions:
     - polyline
     - polymarker
     - text
- correlate on surface of facet, not just edges

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SPHIGS Version 0.8 --- RELEASED  25 Nov

Input added, including pick correlation for fill areas and polyhedra.
Exercising of the input model added to the SPHDEMO example application.

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SPHIGS Version 0.3b (beta)  --- RELEASED  5 Sep

Some documentation bugs fixed.

Better error messages for illegal viewing parameters.

Point light source's default location changed to be (0,+HUGE,+HUGE).
    Note: that's in VRC (UVN) coordinates.

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SPHIGS Version 0.3a (beta)  --- RELEASED 28 Aug

Color and shading support enhanced and made more platform-independent.
      Required a change to the calling sequence for SPH_begin().
      See reference manual section 4 for full details.
Structure- and view-table sizes may now be set by application.

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SPHIGS Version 0.3 (beta) --- RELEASED 17 Aug
