Add fast RasterIO sampling path for generating heightfields with nearest neighbor #744
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…est neighbor interpolation
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Especially when using compressed TIFF heighmaps, the terrain performance suffers a lot from the many 1-pixel RasterIOs performed in
getInterpolatedValue. This pull-request adds a fast path when using nearest neighbor interpolation, which reads the entire tile in one go via RasterIO. On my machine I easily get a factor 8 speedup with this path using a LZW compressed DTM.