How to get free 3D orbit viewing quickly?

Issue:

The 3D Orbit is convenient to control the interactive viewing of objects in 3D. But running it may be a bit inconvenient, you need to run command RTROT or select it from toolbar. Is that any short cut key to run it?

Solution:

The short cut key to run 3D Orbit is Ctrl+Shift+the left mouse click.

As a bonus tips, there are more short cut keys for 3D viewing:

·         Ctrl+Left mouse button: Realtime 3D Zooming

·         Ctrl+Right mouse button: Realtime 3D Paning

·         Ctrl+Shift+Right mouse button: 3D orbit around Z-axis