Re: Terrain LOD Modeling

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Ran Yakir (rany++at++bvr.co.il)
Tue, 19 Mar 1996 07:10:32 +0000

> In my application, I am rendering terrain with several LODs, but
> between the separate terrain tiles (when the tiles differ in LOD and are
> comprised of different edge points), the background shows through at
> various locations between the tiles. I knew this would likely be a
> problem, but I am having trouble finding a simple fix for the problem,
> since as the viewpoint changes direction and location, different tiles
> would necessarily be adjacent to other tiles of varying LOD. (we are
> using Performer 1.2 on an Indigo XZ, and will not be upgrading to
> Performer 2.0 for a while).

You can try and add 'walls' at the edge of each tile. Those walls go from each
tile edge vertex down to some minimum altitude. It is not a clean solution, but
it eliminates the background popping. I assume you use lighting model, since
you don't have texture mapping, and you need to see something :-) In that case
you will need to set the normals of the vertices of the walls polygons in such
a way that you will get continuous lighting with the tile itself.

Ran

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