DEMO OPENGL

For the pear demo, the following controls should work in this
version

Controls:
[1] - Single-texture effect (Gouraud shaded, texture-mapped triangles)
[2] - Dual-texturing (Gouraud*texture + environment map)
[3] - Gloss Mapping (Gouraud*texture + environment map * glossmap)

[A] - Toggle marble chessboard reflectivity
[R} - Toggle rotating chessboard

Mouse Drag - Change your point of view

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