how to create 3d surface graphics in qt c++

[Blackzero]

how to create a 3d surface graph in qt c++ that can be set up userintractions such as selecting a point area and setting the height of each point with the mouse etc.

[Asperamanca]

Have you looked at the Qt Quick 3D examples and demos that ship with Qt?

[Blackzero]

@Asperamanca Never, I have never used QML during my design projects.

[Asperamanca]

I think it would be the best fit for your use case (from among the options available in the Qt Framework)