hingeJoint setting causing a hop

Unity Engine
1

I have setup a hingeJoint on a door that is attached to a bigger item. I have written a little script so when I click on the door it swings open. The problem is when I click on the door it actually lifts up a bit prior to the swing. Could someone please review my settings and give me some insight on what I am doing wrong or what else I need to add.

The code is:

var updateFlag = false;

function FixedUpdate () {
	
	if (updateFlag){
		rigidbody.AddForce(0,100,0);
	}
	
}

function OnMouseDown(){
	updateFlag = true;	
}


function OnMouseUp(){
	updateFlag = false;
}

And attached is a .tiff file of the physics settings I have applied.

Thanks again!

– Clint

2

Maybe you should try uploading the tiff file again. (And possibly save it as apng instead to save on bandwidth)

3

The .tiff was actually smaller than the png but here is the .png. Sorry about that.

Regards,

– Clint

16164--535--$mesh_146.png

16164--536--$physics_105.png
16164--536--$physics_105.png512×518 29.6 KB

4

You are adding the force upwards instead of towards the door, apart from that adding a force might not be the best way to do it here.

You might want to use the hingeJoint’s spring for this. The hingeJoint’s spring takes a targetAngle. Once you have it the spring parameters tuned in the inspector you only have to enable it in the same way as you can click on the checkbox using

hingeJoint.useSpring = true;
5

Are you talking about the axis I am setting the hingeJoint to flow on?

If I set the axis to 0,0,90 it twists instead of turn out… I think I am a bit confused on this.

Thanks,

– Clint

6

I am talking about the call to AddForce. AddForce works adds a force upwards in world coordinates. You could apply the force relative to the object:
rigidbody.AddRelativeForce(0, 0, -100);

7

Ah okay, I gotcha! Thanks…

– Clint