Version 201509040905 adds a new option to the view from camera mode: a height offset. It add allows you to add weight to vertices even if they are in a valley on not directly visible from the camera. A tree for example might have a top that is visible if it is longer than the valley is deep at that point. Using this feature when populating an area with tree particles still reduces the number of particles needed but adds an extra bit of realism, especially on ridges seen side-on. This is illustrated in the image below:
In the bottom image you can see that the tiips of some trees peak above the ridge. The generated weight maps used are shown below, with the default on the left and the one with a slight height offset to the right:
The new version is of course available free of charge to people who have already purchased the add-on. Check the BlenderMarket page for more details.
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