atEdgeLeveller

The atEdgeLeveller plugin may be used to smoothly blend the edges of the heightmap to a uniform elevation all around. This may be useful in creating a flat strip around the map when joining maps together (also, see atEdgeBlender), or for making islands, as below:

Before (rough edges)	After (edges set to -50m)

To set the edges of the map to the same value all around, select the 'Operations→Heightfield→Edge levelling' menu option. You will be prompted to enter the edge elevation and edge width parameters, like so:

Edge levelling settings

The Edge altitude is the height, in metres above sea-level, that the edges of the map will be set to. If making an island surrounded by seafloor, set the Edge altitude value to a negative number such as -50.

The Edge depth parameter is the distance, measured in heightmap pixels, that the blending operation will extend into the heightmap from the edges. The default value is one quarter of the map width or height, or 256 pixels (whichever is smaller).

The North, East, South and West checkboxes may be used to enable or disable edge levelling for specific edges of the map.

After you click the OK button, L3DT will store a backup of the heightfield (to allow 'undo'), apply the edge levelling calculation, and then re-draw the heightfield. If you do not like the results, or would like to change some of the settings, please use the 'Edit→Undo' menu option.

2016/04/15 — Released v16.04.0.1 (initial release).