Enable this particular seam.

Point group to use as the first half of the seam. This should be an ordered point group to ensure points match with the target.

Point group to use as the second half of the seam. Each point of the group will be joined to the target in the point group order, so ordered point groups should be used.

If the point groups do not line up, cycle the start point this number of points.

If one of the point groups has reversed order, this will let you reverse the order of the seaming. This is useful when procedurally generated seams are pointed the wrong way.

The number of frames to use soft springs before welding the points together.

The strength of the springs.

When the points are welded, bend constraints are also added to make it act like a single flat piece of cloth. Without this, the seam can cusp and bend freely.

The bend stiffness is averaged from the surrounding bend constraints.

Controls if any collision detection is done at all.

Controls if self collisions are detected.

Adds a ground plane to the simulation. The ground plane will be visualized with a blue grid.

Location of the center of the ground plane.

Number of collision detection passes to perform. These are interleaved between the constraint iterations. Since collision is expensive, it is best to minimize this. But frequent interleaving helps avoid tent-poling effects where a small collider is fighting with the no-stretch constraints. In practice we find 10 to be correct for most situations, and substeps often being a better solution to increase quality.

After all constraints are performed, a final round of collision detection is done. Collisions are often the most noticeable failure mode, and it is ideal if the next frame can start with non-intersecting geometry. Thus a final cleanup pass can achieve these requirements. We have found that “number of stacked layers + 2” is a good estimate for this number. This allows the effect of the underlying collider to ripple through the stacked layers fully.

In any collision pass, any colliding pair may not be fully resolved. This number of additional collider-pair passes will be run until they are resolved. Since these are only performed on active colliders (and no new collision search is done) this is very cheap.

The layer integer point attribute is used to flag point as belonging to different layers of cloth. Higher numbers refer to higher layers. Layer Shock will make lower layers this many times heavier during collision evaluation, ensuring the higher layers will move out of their way. The rest of the dynamics are unaffected by this, and the difference is fixed regardless of the number of layers between the two. This can be thought of as a way to dial between one-way layering of sims and fully coupled sims.

A threshold at which to apply full friction. When the ratio of the tangential velocity and the normal impulse is less than this, the tangential velocity will be fully eliminated through friction. This is roughly tan() of the slope angle that will allow sliding under gravity.

If the static threshold fails, this controls what percentage the tangential velocity will be reduced in the dynamic friction case.