I'd like to have normalmapping on terrain. Has anyone got experience with this? It seems the tangents are not correct/cannot be used with terrains. The manual says:
Quote:

Tangent
Calculates the u tangents for the 3rd texture coordinate set (TEXCOORD2). This way tangents can be used for model or level geometry shaders. The binormal vector (v tangent) can be calculated by the vertex shader from the cross product of the vertex normal and the u tangent. On animated models the tangents have to be recalculated every frame, affecting the frame rate, so don't use this flag unnecessarily.



Does anyone know if it is possible to use normalmapping for terrains anyway?

shader tutorial