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Vellum Solver SOP: static threshold -> @friction, dynamic scale -> @dynamicfriction

objects return to rest shape unless plasticity enabled eg. for hair or grass which gets pressed down
enable plasticity in Vellum Constraints node

Vellum Constraints with Vellum Solver, wired up to force_output for dynamic constraints

eg. constrain to nearest point on primitive (not same point across time) for stitching

santity-check pscale by showing thickness using Vellum Solver SOP's visualize tab
spead vs quality: substeps, constraint iterations, collision passes, post collision passes
too stretchy and not converging? increase constraint iterations (cheaper than substeps)
protrusion problems? (sharp point colliding with high res cloth only deforms local) increase collision passes or substeps
failed collision? 1. make cloth thicker (but NOT thicker than edge lengths!) 2. increase substeps for high res cloth 3. increase post collision passes 4. layer numbers for stacked cloth (higher layers act lighter)
asymmetric solve? increase smoothing iterations
unruly object? possibly self-intersections if pscales to large - can use plasticity to set final configuration to initial rest pos. If not converging (especially pressure and struct constraints), increase smoothing iterations, damping and sort contraints randomly
unstable pins? (strong bend constraints and hard pins) use soft constraints and more smoothing iterations
restarting sims? (using output of a previous sim as a starting point) be careful to properly setup attributes - see docs
collisions not working? check docs for what is used as a collider for each geometry type
crinkled cloth? restage closer to origin or use 64-bit solve