Cloth attach constraint jump

[kiryha]

I have a cloth simulation set up. After some changes in the scene (I scale my object down and change surface collider object) clothattachconstraint starts to jump up in the 3rd frame and I can't figure out why and how to fix it.

 

aeromen_sim_00.hipnc

Edited November 21, 2017 by kiryha

[Noobini]

in your Cloth Object, go to Visualization, enable Collision Radius...you've got ginormous blue balls !!!

go to Collisions, dial down the radius...waaaaaaaaaay down...0.001 something like that....turn off Visualization.

Also in your Constrained Points...why hardcode ? Why not put in there constr instead ?

[kiryha]

Collision radius was the issue, thank you Noobini!

> Why not put in there constr instead ?
It was just leftovers from scene changes, sure I will use group in the constraint.

I have another question related to this scene. I set up cloth simulation only and then I notice the wrong scale of my objects, so I scale them down, but cloth behavior changes dramatically.
Is there a way to get the previous behavior with a new scales? (You can see in previous behavior attached mov file)

aeromenDance_05.mov

[tamagochy]

Simple way scale it down after sim. If you want sim in new scale you need to change all params inside dop, because it depends from scale...

[kiryha]

Scale after sim is the obvious solution...

Change ALL parameters inside DOP sounds crazy Should be a limited list of parameters to change.

[tamagochy]

Nope, all parameters inside dop depends from scale, but scale after sim its better because often scene scale up before dop sim to avoid small scale solver errors then scale down. Nothing dangerous in this way))

But yea, basically you should change all params that you use for tuning the sim and check all tolerances and collisions sizes))

Edited November 24, 2017 by tamagochy