3Ds Max - Slice
Slice
The slice modifier lets you use a cutting plane to slice through a mesh, creating new vertices, edges, and faces based on the location of the slice plane gizmo. The vertices can either refine (subdivide) or split the mesh, and you can also remove the mesh from one side of the plane.
Step1: Create a Sphere.
Fig. 107
Step2: click on modify tab and select slice tool.
Fig. 108
Step3: click on remove top option button.
Fig. 109