Please help with Qt3D

Hello,

I need to find the intersection of a terrain (such as earth surface) with a QPlane3D.

Assuming the terrain is defined by a set of (x, y, z)...

I can't find the appropriate class to represent the terrain in Qt3D. QVector3DArray doesn't seem to be for that purpose, and QTriangle3D doesn't have method to find the intersection with an QPlane3D...

Help is very much appreciated...