Do not release terrain mesh data after creating vertex array.
Add ray-triangle intersection test.
Add ray-triangle intersection tests.
Add ray-sphere intersection test.
Pick rendered tiles bounding spheres.
Pick terrain mesh.
Merge branch 'master' into pick-terrain
Updates after merge.
Merge branch 'master' into pick-terrain
Pan terrain in 3D.
Merge branch 'master' into pick-terrain
Pick terrain when tilting in 3D.
Add picking terrain and use it when tilting in Columbus view.
Pick terrain in Columbus view when panning.
Some clean up.
Merge branch 'master' into pick-terrain
Some more clean up.
Fix Sandcastle examples, dynamic object view, and widgets.
Fix Geocoder and HomeButton after last change.
Fix ScreenSpaceCameraController, Geocoder, and HomeButton specs.