index.md

Goal:

• Animate or set a tilt for the Cesium camera, «à la Google Maps». IE keeping the bottom line of the view unchanged.
• The view has to keep unchanged, if an angle is applied once positive then one negative.
• It has to work whatever the rotation to the north is (as it can be changed in ol3’s 2D view).

Input:

• A cesium scene with a camera positionned from its ol3 equivalent:
  • extent set with viewExtent method,
  • rotation (to the north) set with twistLeft method
• a angle α (positive/negative) to tilt the view of,
• a animation duration (in ms, may equals 0 for immediate change).

Code:

• The code should replace the method setTiltedView in this Gist
• Current implementation set camera angle with the camera as the origin AND move up/down to simulate the wanted effect.

schema.png