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Submitted by , posted on 25 January 2002



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This is the current version of my bezier patch landscape renderer, it is not optimized at all e.g. no visibility tests, tri strips for rendering, no LOD etc. The stats for the landscape shown in the image are
  • Tris per strip - 14
  • Strips per patch - 8
  • Patches in landscape - 7225
  • For a grand total of 809200 tris
  • As you can see in the bumpier parts of the landscape, I have not enforced continuity between the patches for smooth lighting, although the flatter parts do look reasonably good (IMHO :)

    In this version, every patch is tesselated to the same level and the vertices for each patch are calculated at load time using forward differencing (a big thanks to Adrian Perez's - Advanced 3D Game Programming in DX7 ), and are then drawn as strips every frame.

    The landscape is just a raw greyscale image, I use the values from the image as the z-offset for each patch's control points (16 pixels per patch, shared edges), rotate the thing 90 degrees when drawing to make it horizontal instead of vertical, and voila! instant terrain.

    I've just been putting code together to try to do the things I want as i've gone along learning OpenGL, and this is the result so far.

    Brett Gillick
    - Shabadoo-



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