How to rotate one object depending on rotation for another?[advanced]

Unity Engine
1

Hello,

I made steering wheel that rotates infinity as boat steering wheel. 

wheel.transform.rotation = Quaternions.Euler(0, angle, 0);

this work fine.

Than add object that use same angle but I want so it will rotate much slowly like 2 full spins wheel = 1 spin object;

how realize this? I broke my brain...

Boat steering wheel rotates from 0 to 360 degrees. If I simple devide it by 2, I will get issue and this is correct but not that what I'm looking for.

other words I want like this:

1 wheel spin = 0.5 object spin, 2 spin = 1 spin

var angle : float = wheel_angle / 2;

made issue because when I get 360 degress - my object reset rotation again from 0 too.... so I always get like 0-360 wheel = 0-180 object (

damn I can't say that I want (((
2

It’s probably easier to use the delta. Instead of worrying about absolute rotation, just rotate the rudder (or whatever) by half the amount that the wheel rotates each frame.

3

This isn’t advanced.

When you read the calculate the rotational delta of Obj A just apply one half of that to Obj B.

4

Ok, here is my sources ( I don’t post all variables declarations) just ObjB it’s mycube

private var mycube:GameObject = null;

function Start ()
{
mycube = GameObject.Find(‘Cube’);
}

function OnMouseUp(){

isMouseDown = false;

}

function OnMouseDown(){
old_rotations = transform.rotation.eulerAngles.z;

var screenPos_OLD:Vector3 = Camera.allCameras[1].WorldToScreenPoint(transform.position);
var deltaX_OLD:float = Input.mousePosition.x - screenPos_OLD.x;
var deltaY_OLD:float = Input.mousePosition.y - screenPos_OLD.y;
var radians_OLD:float = Mathf.Atan2( deltaY_OLD, deltaX_OLD);
degress_OLD = (radians_OLD * 180 ) / Mathf.PI;

isMouseDown = true;

}

function OnMouseDrag (){
if ( isMouseDown ) {

var screenPos_NEW:Vector3 = Camera.allCameras[1].WorldToScreenPoint(transform.position);
var deltaX_NEW:float = Input.mousePosition.x - screenPos_NEW.x;
var deltaY_NEW:float = Input.mousePosition.y - screenPos_NEW.y;
var radians_NEW:float = Mathf.Atan2( deltaY_NEW, deltaX_NEW);

var degress_NEW:float = (radians_NEW * 180 ) / Mathf.PI;

var delta_angles:float = degress_NEW - degress_OLD;
var targetAngle : float = old_rotations - delta_angles;

transform.rotation = Quaternion.Euler(0,180, targetAngle);

rudder_angle= transform.eulerAngles.z;
mycube.transform.rotation = Quaternion.Euler ( 0, rudder_angle, 0 );

}

}

Last lines it’s angles from 0 to 360 of rudder and mycube it’s another object. For example - boat.

when my rudder goes from 360 to 0 - by boat stops on 180 and than resets to 0 again I will use this rudder_angle= transform.eulerAngles.z / 2;

what about addeding on OnMouseDrag I don’t know. When mouse down it’s work as Update each frame (

please help.

I’m not Unity3D developer, I convert this code from Flash ActionScript 3.0, where I’m more brained )
In AS3 I done this in a few minutes because there don’t unsed any Euler angles ((((

5

Any help?

6

Wow ,amazing

7

so ) what with helping? )))

8

Use your own variable (e.g. rudder_angle) - which must not be overwritten by a transform - to store the angle even beyond 360…
Then just set the rotation using “rudder_angle % 360” or if you want to apply only the half “(rudder_angle / 2) % 360”

P.S. this thread should be labelled “beginner”, not “advanced”

9

I can’t figureout this…

I can’t get angle beyound 360 because my rudder return delta so I rotate it around to infinity

When I get targetAngle that also receiving my rudder - its from -90 to 270 fixed! I know this from Debug.Log

Step 2 I know, I do right away in anther 3D engine. But what should be in step 1 - I can’t understand … damn… All people said strange words about transforms and etc but I can’t understand how this must be applied in my code above

10

I can think of some other descriptions for the title.

Stop Making this so hard for yourself…

You can figure out the rotation amount using your mouse drag, but here is a basic script that will rotate your rudder and steering wheel using Left/Right Arrows…

I might get the syntax wrong since I dont bother with JS, but here goes… I may also be rotating the rudder backwards… if so, just swap the left and right rotation code… I may also be rotating around the wrong axis, again, just move the rotation code into the correct XYZ

var SteeringWheel : Transform;
var Rudder : Transform;

var TurnRate : float = 5;
var MaximumRudder : float = 30;

function Update()
{
  var rudderRotation : float = Rudder.localEulerAngles.y; 

  if(Input.GetKey(KeyCode.LeftArrow))  {
        SteeringWheel.Rotate(-TurnRate * Time.deltaTime,0,0);
        if(rudderRotation < 180  rudderRotation < MaximumRudder)
             Rudder.Rotate(0, TurnRate * Time.deltaTime * 0.5f,0);

  } else if(Input.GetKey(KeyCode.RightArrow))  {
        SteeringWheel.Rotate(TurnRate * Time.deltaTime,0,0);
        if(rudderRotation > 180  rudderRotation > 360-MaximumRudder)
             Rudder.Rotate(0, -TurnRate * Time.deltaTime * 0.5f,0);

  }


}