Tetrahedra are now independent from changes in mesh density/polygon count and scale. For example, if you upscale an object, you had to adjust constraints and other simulation parameters to get the same result. With resolution-independent tets, you can change scale and achieve almost identical results without having to readjust the simulation.

See the Vellum Constraints SOP for additional information.

The Vellum Constraints SOP has a new Static Topology parameter to flag the output constraint primitives as static, meaning they will not slide or be broken, removed, or welded during the simulation. This specification allows the Vellum Solver to skip these constraints if required to re-graph color the constraints. This option is most useful when a large number of dense static constraints, e.g. high-resolution tetrahedra, would otherwise require frequent, expensive re-coloring when connected together with sliding or breaking stitch constraints, as in a muscle or tissue simulation. You can find the Static Topology option in the Attributes sub-pane.

The new Vellum Attach Constraints node allows you to edit existing or create entirely new Attach to Geometry and Stitch constraints for Vellum. You can interactively draw connection lines between a point on the cloth mesh and a point or a surface position on the target mesh you want to be attach to or stitch. The workflow is very similar to the RBD Constraints from Lines node.