you basically 2 options.
1) Adjust your camerarange
Generally you should keep the near# value as high as possible and the far# value as close as possible while still keeping near# closer than far#.
2) Use dualrendering.
Using dual rendering you keep the first render from 500 to 10000 units away and the second from 1 to 500. This gives you a defacto larger Z-buffer at the expense of rendering everything twice.
Andy
1) Adjust your camerarange
Generally you should keep the near# value as high as possible and the far# value as close as possible while still keeping near# closer than far#.
2) Use dualrendering.
Using dual rendering you keep the first render from 500 to 10000 units away and the second from 1 to 500. This gives you a defacto larger Z-buffer at the expense of rendering everything twice.
Andy