removed lastvalidposition
implementing collision handling, step 1 - simple
naive bounciness
debugging inconsistent bounce response
more consistent bounce behavior
have lost the bounce consistency of earlier
added time warp to simulation for debugging
definitely something wonky, need to debug before proceeding
just figured out a really weird bug with non-conforming bounce behavior due to non-deterministic results from the constraint sorting system, whereby apparently unrelated constraints could affect each other via changing the result of a constraint sort
successfully stopping faces that collide with points
progress