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One of the problems with using billboards, is that items must be rotated towards the camera, in order to get a 3D look. Forest can do it automatically, using the Camera features included in this rollout.
Also, the plugin allows us to build only the items which are inside of the camera's frustrum, allowing to create large areas of vegetation while minimizing the number of scattered items.
With the Camera button we assign a camera in the scene, "Clear" un-assigns it. "Copy" assigns the current camera to all Forest objects in the scene.
This checkbox automatically assigns the camera to the active view, if any.
When on, assigns also the active camera to Look-At target (see below). This is not necessary for billboards (Geometry->Template mode), which do it automatically.
Using this checkbox, we limit the items only to the areas covered by the camera's field of view.
Sometimes (in scenes with camera motion), it's possible that some items will appear or disappear "suddenly" from the edge of view because the vision limit is very narrow. With this parameter, we can widen the field of view. With a 10% or 20% value, the effect is solved in most scenes.
This parameter limits the creation of items beyond a specified distance from the camera. This value is defined in scene's unit system.
Extends the creation of items behind the camera's position. Use it in combination with the "Expand" parameter, to fix the problem of items and shadows appearing suddenly from the edge of view.
When enabled, rotates the items to look at a specified object (the camera or other node from the scene). This option is commonly used for One-plane billboards, but it also works with Custom Objects.
Copy the current camera parameters to all Forest objects in the scene.
Lets you to define density and scale curves for camera distance.
If "Use Environment Range" is on, the range values are taken from the Canera's environment range. This allows us to assign different ranges from each camera easily.
Be careful if you use falloffs with camera motion, because items may appear or disappear suddenly (the distance to camera changes when moving).