The geometry group for new constraints.

The path to the geometry new “attach to geometry” constraints will point to. When left empty, it will use the collision geometry.

The default target type for newly created constraints.

Subset of the constraint geometry to consider when importing existing constraints to edit.

Recreates connection lines for existing constraints, allowing you to edit their target type and anchor positions.

The number of connection lines representing constraints to be created or edited.

The connection line’s anchor position on the input mesh.

The connection line’s anchor position on the target mesh (or input mesh for stitch constraints).

The connection line’s target type.

The constraint primitive number the connection line represents for imported constraints. Defaults to -1 for new constraints.

The path to the geometry “attach to geometry” constraint points to.

Subset of the imported constraints to apply attributes to.

For Attach to Geometry and Stitch Points constraints, the attachment point of the constraint will slide across the target surface at this rate, where 1 matches the constrained point’s velocity. This option only works to slide across primitives, so the constraint’s Target Type must be set to Point to Surface or Stitch. The method used for finding the next closest sliding target can be set with the Vellum Solver’s Sliding Method parameter.

A point attribute that scales the Sliding Rate when set to Scale by Attribute. This attribute will be applied according to the attribute Promotion Method, and will be stored on the constraint to be applied during the simulation. In this way the attachment point can slide across a painted surface, where the painted attribute value controls the Sliding Rate.

The stiffness of the constraint, which controls how strongly the constraint pulls particles back towards its initial rest state. To dial in initial values, change by factors of 10.

Point attribute to scale the stiffness by.

As effective changes in stiffness requires painting over orders of magnitude, this has a logarithmic effect.

Single slider control over the stiffness.

As effective changes in stiffness requires painting over orders of magnitude, this has a logarithmic effect.

Stiff constraints tend to vibrate or jitter unacceptably. Damping reduces this by bleeding energy when evaluating the constraint. Too much damping can prevent the constraint from being satisfied, however. Values less than 1 must be used.

Attribute to adjust damping, multiplied into the damping ratio.

Single slider to control damping, multiplied into the damping ratio.

Imported constraints' restlength attribute will not be updated to their new length.

The rest length of the distance constraints will be the original distance between the points. This scale can be used to increase or decrease this. Setting to 0 will try to collapse the points together.

The stiffness of the constraint when being compressed below its initial rest distance. A very stiff low resolution cloth can become unbendable due to its topology, rather than due to the bend constraints. A network of triangles has very few ways that it can bend if it is fully stiff. By setting a lower compression stiffness, the cloth is allowed to collapse and regain its fluidity. Usually this has to be raised with higher resolution cloth.

The stiffness of the constraint in the direction tangent to the target surface for Attach to Geometry constraints. Tangent stiffness can be useful to help hold up pants or a belt that are attached to a body at the waist, for example.

The distance from the rest length at which the stiffness of the constraint decreases to zero, or increases from zero to full stiffness, depending on the direction of the dropoff. A Decreasing dropoff means that the stiffness starts at full strength and decreases to zero at the Dropoff distance from the rest length. An Increasing dropoff means the stiffness starts at zero and increases to full stiffness at the specified distance from rest length. If Min Stiffness is enabled, its value is used as the minimum stiffness in these calculations, rather than zero.

Decreasing dropoff can be useful for creating glue constraints that lose stiffness as they are stretched, decreasing to zero at the specified distance. Using the same distance in the breaking Threshold with a Break Type of Stretch Distance will cause the constraints to be removed at the same time they reduce to zero stiffness.

Constraints that attach to geometry or pin to the target can optionally blend in the target’s velocity. This requires the target to have a v point attribute to provide the local velocity. The blending is done per 24th of a second, so a blend factor of 0.5 will mix in 50% of the target velocity in a standard frame.

Blending in velocity will highly damp the simulation, but can be useful to allow the cloth to anticipate motion, avoiding whiplashing from sudden movements. Zero stiffness attachment constraints can be used to apply only velocity blending without any additional forces.

The scale-by-attribute functions have to apply the possible different scale attribute values on the points involved in the constraint to a single constraint. This controls how they are blended together.

A string stored in the constraint_tag primitive attribute for all constraints created by this node. This tag can be used in the Constraint Group parameter on the Vellum Constraint Property SOP to easily to alter specific constraints.