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Add Area Seeder from Selection

Area seeders are used to model the initiation areas of falling rocks on the slope surface. Rock locations are generated with a Uniform distribution on an area seeder (i.e., a rock will fall from any point on an area seeder with equal probability).

To add an area seeder from selection:

Select Edit > Selection Mode > Faces Selection

Faces can be selected in the rectangle selection mode or the lasso selection mode. Select Edit > Selection Region Mode to choose between the two options.

Selection Region Mode
Selection Region Mode from the edit dropdown menu

Left-click and drag the cursor to select an area of the slope surface. Selected faces should appear in orange.

Video of Area Seeder drawn in the 3D viewport
Video showing the Lasso Selection of a pit wall

Once the selection is complete, select Seeder > Add Area Seeder from Selection.

A dialog should appear that allows the definition of seeder properties and additional options for the rock starting locations.

Each area seeder has an assigned seeder property. Seeder properties can be viewed/modified by clicking on the pencil icon next to the property dropdown menu.

The Elevation (Z Value) section is used to refine the rocks' starting z-value. The options are:

  • On Surface,
  • Height Above Surface,
  • Absolute Value, or
  • Custom

Select OK to finish adding the area seeder.

Area seeder creation is currently limited to contiguous face selections. Area seeders cannot be created from multiple selections that are disjoint.
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