is 'iskinematic = true' changing the shape of my rigidbody?

Unity Engine
1

Hey there helpful Unity people, I’m still quite new to Unity, but I tried making this ‘grab/let go of/throw’ object script.

It should work similar to the half life 2 gravity gun, and i just tag any rigidbodies with ‘pickupableball’.

It works, to a degree: it let’s me pick up things and hold them by holding down ‘grab’ button, then when I let go of ‘grab’, the object drops. And if I’m holding ‘grab’ and press ‘fire1’ - it throws the object forward. Sweet as.

However the object grabbed seems to frequently change shape - i.e I have a beach ball rigidbody that gets squished into an oblong when I grab/throw/re-grab it.

The collider of the rigidbody even changes so it starts rolling around all higgildy piggildy.

var objectPickedUp : boolean = false;
var currentObject : GameObject;
var hit : RaycastHit;
var placement : Transform;
var throwForce : float;

function Update () 
	{
		if(objectPickedUp == true  !Input.GetButton("grab"))
			{
				dropItLikeItsHot();
			}

		if(objectPickedUp == true  Input.GetButtonDown("Fire1"))
			{
				getItTheFuckOuttaHere();
			}	
			
		if(Physics.Raycast (Camera.main.transform.position, Camera.main.transform.TransformDirection (0, 0,1), hit, 2))
			{
				if(hit.collider.gameObject.tag=="pickupableBall"  objectPickedUp == false  Input.GetButtonDown("grab"))
					{
						placement = GameObject.Find("hand").transform;
						currentObject = hit.collider.gameObject;
						objectPickedUp = true;
						pickUpShit();
					}
			}

	}

function pickUpShit()
	{
		currentObject.rigidbody.isKinematic = true;
		currentObject.transform.position = placement.position;
		currentObject.transform.parent = placement; 
	}

function dropItLikeItsHot()
	{
		objectPickedUp = false;
		currentObject.rigidbody.isKinematic = false;
		currentObject.transform.parent = null;
		currentObject = null;
	}

function getItTheFuckOuttaHere()
	{
		objectPickedUp = false;
		currentObject.rigidbody.isKinematic = false;
		currentObject.transform.parent = null;
		cameraRelativeFront = Camera.main.transform.TransformDirection (0, 0,1);
		currentObject.rigidbody.AddForce (cameraRelativeFront * throwForce);
		currentObject = null;
	}

I’m stumped by this, I’ve somehow turned my player character into some sort of Lennie who crushes everything he touches!

**apologies for my code naming conventions.

2

Setting isKinematic won’t affect the colliders, but parenting a rigidbody to another object (or vice versa) can have some strange effects. Generally, to attach a rigidbody to another, it is best to use a fixed joint.

3

cheers,

i’m not sure if fixed joint is what i need (i’m looking a deux ex style ‘pick up’ script) to allow me to move boxes around/set them down in place/throw them - i.e it suspends the object in front of the player and moves with the camera - even up and down to set blocks on top of other blocks, etc.

I figured the parent was causing the problem so I bypassed this by not making the rigidbody a child.

I just check if objectpickedup == true, then match position and rotation of currentobject to ‘placement’ (the hand position).

if(objectPickedUp == true)
	{
	currentObject.transform.position = placement.position;
	currentObject.transform.rotation = placement.rotation;
	}

Seems to get the effect I wanted - a bit jittery but I could live with it.

Would fixed joint be more for pushing/pulling an object around like tomb raider style block pushing puzzles?

Thanks for the info.

4

Hi send my code basically it tests by me…
its working fine…

check it…
may be its working for you…