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enh(viz): make 3D scene more tactile friendly

Lucas SCHMIDT requested to merge 947-enh-viz-make-3d-scene-more-tactile-friendly into dev

Description

These changes will allow to use gestures on the 3D scene. It allows in particular to pinch fingers to zoom and to long tap to place a landmark. Simple taps and pan gestures should intuitively map to mouse clicks and mouse drags.

Closes #947 (closed)

How to test it?

Obviously you'll need a touchscreen to test this.

  • Zoom on the image by pinching your fingers
  • Place a landmark by long tapping on a location
  • Rotate the image by dragging your finger on the scene
  • Move a landmark by touching and drag it across the image

Additionally, you can run the ZoomOutGesture test.

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