Forums » Help » Box2D Joints not working

I am using the plugin from demo on this page.

Entities, collision, etc work fine. Except for the joints.

I run the following code and it produces an error.

Code: (Btw, the bodies aren't undefined. I've checked that.)

var jointDef = new Box2D.Dynamics.Joints.b2JointDef();
jointDef.bodyA = entity1.body;
jointDef.bodyB = entity2.body;
jointDef.collideConnected = false;

var joint = ig.world.CreateJoint(jointDef);

Error:
[Error] TypeError: null is not an object (evaluating 'c.m_prev=null') - CreateJoint - lib.js

The line of code (causing the error in lib.js):

...CreateJoint=function(a){var c=q.Create(a,null);c.m_prev=null;if(c.m_next=this.m_jointList)...

Perhaps instead of:

var joint = new Box2D.Dynamics.Joints.b2JointDef();

you meant:

var jointDef = new Box2D.Dynamics.Joints.b2JointDef();

Nope. I forgot to re-name that when putting it in the forum. (And I have tried renaming it in the code too)

What line in "lib.js" is that error occurring on?

(I added this when I made my other reply)

The line of code (causing the error in lib.js):

...CreateJoint=function(a){var c=q.Create(a,null);c.m_prev=null;if(c.m_next=this.m_jointList)...