elexis 02fe3ef3e3 Implement SmoothingPainter for random maps, fixes #5027. ...

This allows only specific regions of the map to be smoothened,
especially important on imported digital elevation models.
It uses the Inverse Distance Weighting / Shepard's method as mentioned
by Imarok and formerly implemented in the Pyrenean Sierra map by wraitii
in a796800bb1.

Supersedes the globalSmoothHeightmap function in FeXoRs heightmap
library, refs #3764.
Drop the heightmap argument to be consistent with the other painters.
If painting on arbitrary heightmaps is wished, the createArea mechanism,
all Placers, Painters, Constraints and Areas can and should support
that.

Update the HeightmapPainter from 6319647795 to not break if
TILE_CENTERED_HEIGHT_MAP is enabled (i.e. numVertices = numTiles), refs
#5018.
Use that mode on Mediterranean and Red Sea.
Drop the disabling of bicubic interpolation in the HeightmapPainter
instead of extending it to this feature.

Inevitable smoothing performance improvement for Belgian Uplands (from
45 to 15 seconds per call), even if it implies a somewhat different
outcome, refs #5011.

This was SVN commit r21175.

2018-02-11 14:56:55 +00:00

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Implement SmoothingPainter for random maps, fixes #5027.

2018-02-11 14:56:55 +00:00

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