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Question by Sr. Thankyou · Jan 21, 2015 at 11:49 AM · c#physics2djoints

Set the Break Point of a SpringJoint2D

Hi everyone!

I have a simple mockup game with some draggable ghosts (sprites). Sometimes the sprites will be stuck in the level obstacles, and i need the springJoint2D to "break" when the distance between the Sprite and the Cursor are too long. Like a "MaxDistance" value.

The SpringJoint is place via script, and I can't figure out how to listen neither the _SpringJoint2d.anchor or _SpringJoint.connectedAnchor positions.

alt text like this.

I am using something like:

 if ("Distance between" > MaxDistance) {
 StopCoroutine ("DragObject");
 };

But i dont know how to describe this "Distance between"...

Someone have a solution for this?

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Answer by Milo_del_mal · Feb 17, 2016 at 06:07 PM

A vector minus a vector gives the length between those two vectors... The magnitude is the distance... But you want to use square magnitude.

/ PSEUDOCODE ***/ distanceSquared = (itemPosition - jointPosition).sqrMagnitude;

if(Mathf.Pow(distanceThreshold, 2) < distanceSquared){ //do logic. }

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avatar image meat5000 ♦ · Feb 17, 2016 at 06:09 PM 0
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Usage of sqr$$anonymous$$agnitude is to save on processing.

http://docs.unity3d.com/ScriptReference/Vector3-sqr$$anonymous$$agnitude.html

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