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Q:
I exported my heightmap to a bitmap file. But the resulting image is completely black (or white).
A:
If you export the heightmap of a whole terrain, the exporter uses the predefined heightrange of the terrain (lets say 0 - 5000 meters) and maps it to 256 grayscale values. If your terrain only uses heights between 0 and 20 meters, everything will be black. (You only have a vertical resolution of
about 20 meters in that setting (5000/256) )
Start with exporting the heightmap of one single sector (from the sector's context menu) and select "Sector" as "Height range" parameter. If you finished terrain modelling, you can adapt the predefined terrain height range to the heights actually used by your terrain. Open the terrain properties dialog (menu "file->terrain properties") and press the "adapt" button.
Try to use RAW export whenever possible, as this will give you the best possible vertical resolution.
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