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Enable Edge Trimming – Toggles the Edge Trimming function, which "trims the edges" of the Scater geometry, removing any instances that scatter outside of the Target Objects or the Include/Exclude Objects.

The typical use cases of Edge Trimming include:

In addition to making the scattering look more refined and natural, the edge trimming feature boosts performance by removing some of the instances you save from RAM and making parsing time shorter.

See the example for more.

Enable the Proxy's Basic Parameters > Flip Axis

Disable the Scatter object's Translations > Rotation > Preserve Model Rotation option

Slope Limitation limits scattering only to 'slopes' at certain angles. It can be used to create realistic spread of trees on curved surfaces, for instance. The lower the Angle range is set, the smaller the angle at which scattering stops.

Up Axis – The angles are measured either between the Local Up Axis and the surface normal, or the World Up Axis and the surface normal. You can select which up normal to use:

Local – When enabled, the Slope Limitation is measured according to the up vector of each individual Targets object.
World – When enabled, the Slope Limitation is measured according to the world Y-axis up vector for all Targets objects in the scene.

See the Slope Limitation Up Axis example for more information.

Min Angle/Max Angle – Defines a range of angles to which the scattering is limited. Instances outside of this range get filtered out. See the Min/Max Angle example below for more information.

Enable Altitude Limitations – Toggles the altitude limitations parameters on and off. Altitude defines a height range (in cm) for the scattered geometry to distribute on.

Altitude Limit Mode – Determines the coordinates space used for determining altitude.

Position Independent – The altitude of the surface points on each individual distribute-on object is evaluated relative to the object center while the object rotation and scale still affect the altitude.
World – The altitude of the surface points on each individual distribute-on object is evaluated in world space (after all transforms).

Min Altitude – Determines the minimum altituge range for the scatter objects. Objects below this threshold are not rendered. 

Max Altitude – Determines the maximum altitude range for the scatter objects. Objects above this threshold are not rendered. See the example for more information.