AnalyticalGraphicsInc/cesium — pull request #2222 by kring (2014-10-24 01:37:40+00:00)
Title: Clamp position to rectangle in interpolateHeight.

sampleTerrain works by computing the tile that contains each of the positions it is sampling using `tilingScheme.positionToTileXY`. For a position very near the edge of a tile, it is possible for this method to return a tile that does not actually contain the position (e.g. latitude is one ulp greater than the north bound). I considered trying to avoid this, but doing so is tricky and a bit expensive. So instead, this change clamps the coordinates coming in to `QuantizedMeshTerrainData.interpolateHeight` to be within the tile.

Fixes #2206