ofxClipPCL

You can clip your mesh vertices by various geometries using CPU/GPU.

For CPU example, see example-gizmo. It depends also on ofxImGui and ofxImGuizmo.

For GPU example, see example. I recommend using this with ofxComposableShader. It makes it easy to combine multiple shader objects in one ofShader so you can write your shader code separated from clipping functionality.