Implementation for simplified spring constraint #39076

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Markus Kasten · 2014-03-09T22:46:24+01:00

Markus Kasten commented

2014-03-09 22:46:24 +01:00

A while ago, I implemented the generic spring and motor constraint, and planned to make a simpler spring constraint 'later'.
Since I found some time today and the generic spring is not very user-friendly, I wrote a patch for the implementation.
I created new functions in die RigidBody API which internally use the functions from the 6dof and 6dof spring constraint, since there is currently no simple spring constraint in bullet (to my knowledge). This should make using an native bullet simple spring constraint easier if bullet comes up with one in the future (I'd say a simple spring would give more performance).

The spring constraint locks all rotational axes and the linear X and Y axis, and uses the Z axis as the springs axis.

spring.diff

A while ago, I implemented the generic spring and motor constraint, and planned to make a simpler spring constraint 'later'. Since I found some time today and the generic spring is not very user-friendly, I wrote a patch for the implementation. I created new functions in die RigidBody API which internally use the functions from the 6dof and 6dof spring constraint, since there is currently no simple spring constraint in bullet (to my knowledge). This should make using an native bullet simple spring constraint easier if bullet comes up with one in the future (I'd say a simple spring would give more performance). The spring constraint locks all rotational axes and the linear X and Y axis, and uses the Z axis as the springs axis. [spring.diff](https://archive.blender.org/developer/F80468/spring.diff)

Markus Kasten commented

2014-03-09 22:46:24 +01:00

Changed status to: 'Open'

Sergej Reich was assigned by Markus Kasten

2014-03-09 22:46:24 +01:00

Markus Kasten commented

2014-03-09 22:46:24 +01:00

Added subscriber: @MarkusKasten

Sergey Sharybin commented

2014-04-11 09:00:44 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2014-04-11 09:00:56 +02:00

Added subscriber: @LukasTonne

Sergey Sharybin commented

2014-04-11 09:00:56 +02:00

@LukasTonne, you might also be interested in this?

Sergej Reich commented

2014-04-25 11:12:44 +02:00

Sorry for responding so late.
In general this is a good idea.
However, I have some reservations.
In hindsight we shouldn't have added the generic spring constraint either.
The main problem is that bullet's builtin springs don't behave very well and make it pretty much impossible to create stiff springs which is the main use case as far as I can see.
So I think we need a better spring implementation before adding it to the UI.

Sorry for responding so late. In general this is a good idea. However, I have some reservations. In hindsight we shouldn't have added the generic spring constraint either. The main problem is that bullet's builtin springs don't behave very well and make it pretty much impossible to create stiff springs which is the main use case as far as I can see. So I think we need a better spring implementation before adding it to the UI.

Sergej Reich commented

2014-08-27 20:05:43 +02:00

Just a heads up, upstream bullet has a new spring constraint that might work better if someone is interested in playing with it.