Constructs a MapTileCuller.
A THREE.Camera.
Checks if the tile's bounding box intersects with the current view's frustum.
The bounding box for the tile.
Sets up culling and computes frustum corners. You mus call this function before the culling starts.
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Second step tile culling: Do additional check for intersection of box and frustum by checking if the frustum is outside any plane of the tiles
bbox(oriented, not AABB). It's in the inverse of the standard frustum test, which excludes many cases where the large terrain tiles straddle the planes of the frustum.http://www.iquilezles.org/www/articles/frustumcorrect/frustumcorrect.htm