koobas.hobune.stream
How to determine if rotation is clockwise or anticlockwise
I am trying to create a dial. It has a number in the center that I want to go up if the rotation is clockwise and go down if the rotation is anticlockwise. Here is my rotation code:
if (Input.touchCount > 0)
{
Touch touch = Input.touches[0];
RaycastHit hit;
Ray ray = camera.ScreenPointToRay(Input.touches[0].position);
if (Physics.Raycast(ray, out hit))
{
if (hit.collider.gameObject == TurnDial)
{
switch (touch.phase)
{
case TouchPhase.Began:
var dir = Camera.main.WorldToScreenPoint(TurnPivot.transform.position);
dir = Input.mousePosition - dir;
baseAngle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
baseAngle -= Mathf.Atan2(TurnPivot.transform.right.y, TurnPivot.transform.right.x) * Mathf.Rad2Deg;
break;
case TouchPhase.Moved:
var dir = Camera.main.WorldToScreenPoint(TurnPivot.transform.position);
dir = Input.mousePosition - dir;
var angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg - baseAngle;
AngleText.text = angle.ToString();
TurnPivot.transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward)
//if rotation is clockwise text number goes up
//else it goes down
break;
}
}
}
}
How can I tell if the dial was rotated clockwise or anticlockwise?
One solution is to compare the starting angle to the ending angle. Decreasing angles result in clockwise rotation, increasing angles result in anticlockwise rotation. IE if (starting > ending) the rotation is clockwise, else the rotation is anticlockwise.
To avoid the pitfall of co-terminal angles, first reduce your angle's representation:
//restrict myAngle to 0-360 degree representation
myAngle %= 360;
if (myAngle < 0) myAngle += 360;
I have an object spinning on its axis how can I deter$$anonymous$$e that the spinning motion is "CW" or "CCW".
In OnActive() or Start() store your current rotation in a variable such as _lastRot. Then, after updating the rotation, compare _lastRot to your current rotation to decide if you have rotated clockwise or not. Then, update _lastRot to equal your current rotation so you can compare against it the next time it moves.
