Camera or shader problem


I’m here with problem described in following picture:

Link to picture

In some camera angle (shader?) dont render terrain correct and show this fail.

Rendering technique: Tessellation
Using shaders: Vertex, Fragment, Geometry, Tess Control, Tess Eq shader
Camera type: Perspective
Heightmap type: float 32bit data via glTexImage2D and then through uniform to shader

Any idea where I can start to finding problem?

SOLVED: Shader problem with clip space view in frustrum