If your height field is 1e8x1e8 units wide and only 20 units tall, then
you'll have to have a huge resolution (around the scale of 1e8 by 1e8) to
get bumps at a small scale. You don't want a height field at that
resolution; you don't have the memory for it.

Try one of these options instead:

 - Use an isosurface. Since it's sampled dynamically, you get perfect
resolution at any scale. However, it will be slower.
 - Use multiple height fields at different resolutions, some close up and
high resolution, others farther away at lower resolutions.

If your camera is close enough to the height field to need to see bumps at a
scale of 20 units or so, then you don't need your height field to be 1e8
units wide; that's overkill.

 - Slime
 [ http://www.slimeland.com/ ]

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