"sierra" effect...

Hello…
I have a terrain rendered with triangles strips, and now I putted a very large quad… to simulate the sea…
but in the intersection of the quad with the terrain, i can see a “sierra effect”
(I cannot explain how is sierra in english)…
something like this:

/|/|/|/|/|/|/|

How can I delete this effect? I think that is Z buffer resolution, but I’m not shure how to change it… and if it will work…

thanks
MARC

push your near depth testing plane as high as possible + bring the far one in close as possible
gluPerspective(…,…,near,far)
or glFrustum(.,.,.,.,near,far)
or use a 24 bit depth buffer

Umm, so “sierra” means “Z-Aliasing” then?

Originally posted by zed:
push your near depth testing plane as high as possible + bring the far one in close as possible
gluPerspective(…,…,near,far)
or glFrustum(.,.,.,.,near,far)
or use a 24 bit depth buffer

The two testing palnes are so close by example 100 and 5000… and the depth buffer is at 32 bit… but the sierra effect stills kiking…

MARC