Area Modifiers Rollout

Add Modifier – Specifies objects to be used for generating projected areas of exclusion or inclusion of Scatter guests. These areas are projected along specified axes and determined by the dimensions of objects or splines included in this list. Scatter Area Modifier objects cannot be the same as the Scatter Host objects. Note that Area Modifiers are available only in Surface and Volume Scatter modes.

Operation See the Operation example below.

Include – Only instances within the projected area are created.
Exclude – Only instances outside the projected area are created.

Axis – Determines the plane of the area modifier projection along the X, Y or Z axis. See the Axis example below.

Falloff Near – Determines the distance from the selected area modifier object where the falloff begins its effect. The falloff range is the gradual fading of the area modifier effect between 100% and 0%. See the Falloff examples below.

Falloff Far – Determines the distance from the selected area modifier object where the falloff range ends and the area modifier loses effect.

Scale – Scale factor affecting instances between the Near and Far Falloff distances. The value represents the effect strength at the end of the falloff range.
For example, a value of 0.5 causes instances to have a scale of 0% at the Falloff Near distance gradually increasing to 50% at the Falloff Far distance. Note that a value of 0 negates the falloff effect altogether. See the Scale example below.

Density – Density factor affecting instances between the Near and Far Falloff distances. The value represents the effect strength at the end of the falloff range. For example, a value of 0.5 causes instances to appear at a density of 0% at the Falloff Near distance gradually increasing to 50% at the Falloff Far distance. Note that a value of 0 negates the falloff effect altogether.

Example: Operation

This example shows the difference between the Include and Exclude Operation modes.

Example: Axis

This example shows the modifier projection plane.

Example: Falloff

This example shows what falloff ranges look like.

Example: Scale

This example shows how the Scale factor affects instances between the Near and Far Falloff distances. The parameters are set as it follows: Operation = Exclude; Falloff Near = 5; Falloff Far = 40.