Simplified 3D Functions

Fastgraph includes six functions for drawing 3D polygons, three for polygons defined in object space, and three for polygons defined in world space. The fg_3Dpolygon() and fg_3Dpolygonobject() functions draw wire frame or single-color polygons. The fg_3Dshade() and fg_3Dshadeobject() functions draw Gouraud-shaded polygons, while fg_3Dtexturemap() and fg_3Dtexturemapobject() draw texture-mapped polygons. Fastgraph also includes the fg_3Dline() function for drawing 3D lines defined in world space.