What is the function of the shear plane in 3ds max?

Using clipping planes, you can exclude some geometry of the scene to view or render some parts of the scene. Each camera has a near clipping plane and a far clipping plane. For the camera, objects closer to the near clipping plane or farther from the far clipping plane are invisible.

If there are many complex geometries in the scene, clipping planes are very useful for rendering some selected scenes. They can also help you create sectional views.

The clipping plane setting is part of the camera creation parameters. In the current unit of the scene, the position of each clipping plane is measured along the camera's line of sight (its local Z axis).

The clipping plane is a part of the general parameters of the camera.

Viewports can also have a clipping plane. You can set the clipping plane of the viewport by right-clicking the label.