lock axis but allow spin?

Unity Engine
1

hi

I want to accomplish the following:

  1. place cube center screen
  2. lock all movement EXCEPT rotating - spinning on Y axis
  3. enable controller to let me spin the cube using physics

?

I dont know how I might lock every motion except y axis rotation…can someone throw a few hints?

cheers!

Tj

2

ok

I think I may have it partially figured out…

configurable joint?

lock all movement except Y-angular?

?

Tj

3

I think i have the joint configured properly…

but now I think the drag code Im using is not properly targeting the right force to make the object spin.

How does one apply (iphone) input code that will only affect rotational Y value of a locked cube - so that it can spin?

Tj

4

It’s easier to do this:

var rigidMan : Rigidbody;

function Start()
{
   rigidMan = rigidbody;
}

function Update()
{
   rigidMan.angularMomentum.x = 0;
   rigidMan.angularMomentum.z = 0;
   rigidMan.velocity = Vector3.zero;
}

This is assuming you wanted to only rotate around the y axis. You’ll need to have a rigidbody attached with gravity turned off, freeze rotation turned off, and iskinematic turned off.

5

ok

first of all -thank you for replying!

I tried this ( Im using iPhone kit ) - and it wouldnt accept the angularMomentum…

but it was ok with angular velocity??

var rigidMan : Rigidbody; 

function Start() 
{ 
   rigidMan = rigidbody; 
} 

function Update() 
{ 
   rigidMan.angularVelocity.x = 0; 
   rigidMan.angularVelocity.z = 0; 
   rigidMan.velocity = Vector3.zero; 
}

or did I need to set the type somewhere because of strict typing?

Tj

6

I guess what Im trying to do - is a like a top - but locked on its axis so its stays center screen.

I want the force input to come from screen input - and I think thats where Im not getting things right.

The input script i have - I believe just affects xy ( up down / left right ) - and not rotational force?

?

Tj