[Gtkradiant] [Bug 632] New: Metasurfaces, phong shading, PicoModel: implement better normal interpolation

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=632

           Summary: Metasurfaces, phong shading, PicoModel: implement better
                    normal interpolation
           Product: GtkRadiant
           Version: 1.2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: q3map2
        AssignedTo: ydnar@shaderlab.com
        ReportedBy: ydnar@shaderlab.com


Change normal interpolation in these 3 components to count each unique normal 
at a vertex once, and average from that, so 3 coplanar triangles don't weight 
the average in their favor.