FTExtrudeGlyph is a specialisation of FTGlyph for creating tessellated extruded polygon glyphs...
FTGLglyph * ftglCreateExtrudeGlyph(FT_GlyphSlot glyph, float depth, float frontOutset, float backOutset, int useDisplayList)
Create a specialisation of FTGLglyph for creating tessellated extruded polygon glyphs.