Landscape Shader - Face Culling

[serial]

I've just noticed a slight artifact with my custom landscape splatting shader.

The best way I can describe it is that faces that should be rendered but just barely
in view of the camera arn't being rendered.

[SylvainTV]

hmm weird.

Is it at chunk level or really face level ?
I mean, do all faces of a chunk disappear at one time ?

And last question, does it happen without your shader heh ?

[serial]

No its at a face level.  The faces don't pop in to view soon enough and they pop out too soon. 

[jviper]

hmm. what is your ccamera's near plane and far plane dists?