Linear Soft Damping not working

Development Programming & Scripting Blueprint
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1

Hello. I have tried to make some type of car spring + gas shock, with Constraint joint, with enabled soft constraint.

So, try this:
Try 1:

  1. Make two boxes, one above another, at some distance. Everything in one blueprint.
  2. Creat Constraint joint between them, so it looks loke column ))
  3. Connect boxes with joint, as usualy
  4. Set ZMotion in Linear Limits to Limited, others to Locked. Cube just have to move vertically.
  5. Set some limit, so it’s not zero. 50 will be good.
  6. Enable Soft Constraint
  7. Leave Stiffness and Damping at 0
  8. Enable force for Z axis, and set it to 50.
  9. Run game. Upper Cube will fall to bottom and then stars to jump up and down on a spring. Everything as expected.

Try 2:

  1. Set Stiffness and damping to 500 or 5000, watever.
  2. Run game
  3. No difference at all. Seem like this values not working.
2

Hello Courvee,

I’m following your steps but I’m wondering what property you’re referring to exactly when you mention “Enable force for Z axis, and set it to 50.” in step 8. There are a few different things that could be considered as “adding force” in the Z axis. What setting are you changing?

3

Sorry for that. I mean set Strength in Linear Motor to 50 (it can be 500, does not matter), and position target by z to 50, or can be leaved 0.

4

Thank you for the additional information. I’ve reported this bug and it can be found here: UE-45226. You can use this report to track the issue’s progress as well.

Have a nice day!