Rotate the globe by dragging it or by adjusting the sliders. When you rotate, you are adjusting the Orthographic projection’s three Euler angles.
See also:
- Turn the Earth
My first crack at letting the user set the rotation. This example does not allow you to drag the globe – there is no direct manipulation.
- Versor Dragging
Fil put the module on GitHub, but I believe Mike Bostock and Jason Davies figured out the math and code. In Mike Bostock’s block, you cannot use sliders to adjust the rotation – there is no abstract manipulation.
- Up and Down the Ladder of Abstraction
Bret Victor’s wonderful essay on using visualization to understand dynamic systems.
The world countries polygons were downloaded from ArcGIS.