Virtual texturing implementation for three.js (r129 up to now).

See code in index.html and examples/

https://itownsresearch.github.io/virtual-texturing/

• Resizing window breaks the app. fixed
• Inconsistent tiles when zooming out (after zooming in). fixed
• Tries to fetch non-existent tiles. fixed
• tile eviction strategy is suboptimal.
• TODO: trilinear filtered sampling of the virtual texture (shows linear 2D filtering of best loaded level for now).

Released with MIT License.