These options appear as a subset of the section in the Paint Effects Brush Settings window, and the Attribute Editor for any brush node.
Occupation Surface includes a group of interdependent attributes that affect the direction of branch growth and size as well as branching density. Use Occupation Surface attributes to create foliage effects that simulate the natural growth patterns of branches, vines, and bushes.
Creates a force at points along the surface of the painted object which attracts the end-points of the nearest Paint Effects tubes. The attractive force influences tubes to grow toward the surface point until a tube occupies the region around the point. After the tube end-point grows to the surface point, it occupies that space, and the surface point no longer attracts other tube end-points.
Higher Occupy Attraction values increase the tendency of the tube ends-points to grow toward the nearest surface point. As the force increases, greater sharpness in the angles of branching occurs as the tube end-points migrate to decreasingly available space.
Attract Radius Scale and Occupy Radius Scale attribute values and Occupy Branch Termination affect how tubes end-points are influenced by the Occupy Attraction force.
Specifies a value that is multiplied by the radius of the Paint Effects tubes to determine the region of unoccupied space that attracts tube end-points. For example, when set to 1, the region attracting a tube end-point is equal to the tube's radius. Attract Radius Offset also affects how the attract radius is calculated.
As Attract Radius Scale values increase, the number of points that the tube end-points are attracted to increases. This lets smaller branches grow into unoccupied space. When the Attract Radius Scale value is greater than Occupy Radius Scale, smaller branches terminate less frequently.
Specifies a value that is added to the radius of the Paint Effects tubes to determine the region of unoccupied space that attracts tube end-points. Attract Radius Scale also affects the size of the attract radius.
Specifies a value that is multiplied by the radius of the Paint Effects tubes to determine the region of space that the tube occupies when it is attracted to a point.
Lower Occupy Radius Scale values allow more space to be colonized by larger numbers of branching tubes. Increasing Occupy Radius Scale while keeping Occupy Radius Offset to near 0 values lets thinner branches occupy the same space occupied by larger and thicker branches.
When the Occupy Radius Scale value is greater than Attraction Radius Scale, smaller branches terminate more frequently.
Specifies a value that is added to the radius of tubes to determine the region of space that a tube occupies when it is attracted to a point. Occupy Radius Scale also affects the size of the occupy radius.
Specifies the number of attractive points on the painted surface. The total number of points on the surface is equal to the square of the set Surface Sample Density value. Surface points are randomly distributed on all the geometry surfaces attached to the Paint Effects brush.
When on, branches attracted into occupied space are terminated.