Houdini 20.5 Nodes Geometry nodes

Group from Attribute Boundary geometry node

Creates a group that includes the boundaries of the specified attribute.

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Since 18.0

Creates a group that includes the boundaries of the specified attribute.

Parameters

Group Name

The name of the new group to create. The resultant attribute boundaries will be placed in this group.

Group Type

The type of elements that will be included in the boundary group.

Base Group

The source elements to restrict the boundary search to. If specified, this group will be converted to the Group Type, and the boundaries of this group will also be included in the result. If Base Group is left blank, all geometry will be considered.

Base Group Type

The type of group to operate on.

Attributes

When turned on, includes the specified attribute boundaries in the constructed boundary group. Attributes can be on either primitives, points or vertices.

Remove Degenerate Bridges

When turned on, degenerate boundary edges will be removed from the output.

Include Unshared Edges

When turned on, edges referenced by only a single polygon will be included in the boundary group.

Include All Unshared Curve Edges

When turned on, unshared edges on curves will be included in the boundary group. To select only the end points of curves and the unshared edges of closed polygons, turn on Include Unshared Edges, and turn off Include All Unshared Curve Edges.

This parameter is only available when Include Unshared Edges is turned on.

Include All Primitives Sharing Attribute Boundary Points

When turned on, all primitives that have at least one point on the attribute boundary will be included in the result. Otherwise, primitives will be required to share an edge with the attribute boundary to be included.

This parameter is only available when Group Type is Primitives.

Inputs

Input Geometry

The geometry on which to find the boundaries.

Examples

GroupFromAttribBoundaryBasic Example for Group from Attribute Boundary geometry node

This example shows how to create a group of edges from the boundaries of a group and the boundaries of a color attribute.

See also

Geometry nodes