No idea how to use Euler angles...

Unity Engine
1

Euler angles aren’t as straightforward to me as it is for you smart people. I’ve watched a lot of videos about it, and I understand how it works, but I can’t find any videos explaining how the numbers behave. So with the following code, I’ve got a behavior show in the video:

var rotationX : int;

function Update() {
	transform.eulerAngles.x = rotationX;
}

How am I supposed to get it past 90 degrees without it glitching like that?

2

The problem with using rotation based on the X axis is that it will actually change the value of Z in the transform’s euler angle and reverse the X-axis. You will notice it if you switch to the rotate tool and rotate the object on the X axis. This is I believe to actually prevent Gimbal Lock (I hope someone can come along and clarify this!).

One easy way which I use to bypass that is to parent it to another game object and rotate it such that rotating the parent via the Y axis will rotate the child the way I want (as rotating Y will give you the full 0-360). Another way is that you can check the Z axis and reverse the value of your X for euler angles.

Also, euler angles is the displayed rotation value on the inspector. In case you didn’t know.

3

Use RotateAround Unity - Scripting API: Transform.RotateAround

    var rotationX : int;
     
    function Update() {
        transform.RotateAround(Vector3.zero, Vector3.up, rotationX);
    }
4

Trouble is that this makes it constantly move. I don’t want it to move in that fashion, I basically want to tell it “your angle of rotation = this number / 240”.

It needs to rotate to a particular angle that equal the second of the day divided by 240, so as to create a real-time rotation.

If there are 86400 seconds in a day, I want to divide the second of the day by 240 to get the appropriate angle that the Sun needs to be at. Not sure if any of that makes sense.

5

Well, let’s modify a little bit this code and it will work as you need, I think :slight_smile:

        var rotationX : float = 0;

        @HideInInspector
        var last_rotationX : float = 0;
         
        function Update() {

            if(rotationX != last_rotationX)
            {
                transform.RotateAround(Vector3.zero, Vector3.up, rotationX - last_rotationX);
                last_rotationX = rotationX;
            }

        }
6

This is brilliant. You were my hero for the day.

Also, your live tiles are awesome. If I had the money, I’d throw it at you immediately, even if I currently have no use for it. But alas, I was lucky to get the cash to get Pro @__@

I had to modify the code a bit, because I need Rotate, not RotateAround, but the math remains, and implementing the real-time functionality was very very simple.

var rotationX : float = 0;

@HideInInspector
var last_rotationX : float = 0;

function Update() {
	rotationX = Timekeeper.secondOfDay / 240;
	if(rotationX != last_rotationX)
		{
			transform.Rotate(rotationX - last_rotationX, 0, 0);
			last_rotationX = rotationX;
		}
}