I'm trying to do drag to rotate sort of thing, so far the code is fine. However when starting to drag (left clicking first), the object rotate to a random direction first which looks odd.

here is my code :

public Camera cam;
public float smoothAngle, dragPower = .3f;
public bool isRadial = true;
float angle, angleOld, angleDelta, angleRef;
Vector2 mousePosOld, mousePosDelta = Vector2.zero;

void Update()
{
  Vector2 mousePos = cam.ScreenToWorldPoint(Input.mousePosition);
  if (Input.GetMouseButton(0))
  {
    mousePosDelta = mousePos - mousePosOld; 
    float rotX = (mousePosDelta.magnitude / Time.deltaTime) 
                  * dragPower 
                  * -Mathf.Sign(mousePos.y) 
                  * Mathf.Sign(Vector2.Dot(Vector2.right, mousePosDelta));
      
    transform.Rotate(Vector3.forward, rotX);
    
    mousePosOld = mousePos;
    angleDelta = Mathf.DeltaAngle(angleOld, transform.localEulerAngles.z);
    angleOld = transform.localEulerAngles.z;
  }
  else
  {
    transform.RotateAround(transform.position, transform.forward, angleDelta);
    angleDelta = Mathf.SmoothDampAngle(angleDelta, 0, ref angleRef, smoothAngle);
  }
}
 
Vector2 rotated2D(Vector2 V, float a)
{
  return new Vector2(
      V.x * Mathf.Cos(a) - V.y * Mathf.Sin(a), 
      V.x * Mathf.Sin(a) + V.y * Mathf.Cos(a));
}

this is the effect :

I'm trying to do drag to rotate sort of thing, so far the code is fine. However when starting to drag (left clicking first), the object rotate to a random direction first which looks odd.

here is my code :

public Camera cam;
public float smoothAngle, dragPower = .3f;
public bool isRadial = true;
float angle, angleOld, angleDelta, angleRef;
Vector2 mousePosOld, mousePosDelta = Vector2.zero;

void Update()
{
  Vector2 mousePos = cam.ScreenToWorldPoint(Input.mousePosition);
  if (Input.GetMouseButton(0))
  {
    mousePosDelta = mousePos - mousePosOld; 
    float rotX = (mousePosDelta.magnitude / Time.deltaTime) 
                  * dragPower 
                  * -Mathf.Sign(mousePos.y) 
                  * Mathf.Sign(Vector2.Dot(Vector2.right, mousePosDelta));
      
    transform.Rotate(Vector3.forward, rotX);
    
    mousePosOld = mousePos;
    angleDelta = Mathf.DeltaAngle(angleOld, transform.localEulerAngles.z);
    angleOld = transform.localEulerAngles.z;
  }
  else
  {
    transform.RotateAround(transform.position, transform.forward, angleDelta);
    angleDelta = Mathf.SmoothDampAngle(angleDelta, 0, ref angleRef, smoothAngle);
  }
}

this is the effect :

i'm trying to do drag to rotate sort of thing, so far the code is fine. However when starting to drag (left clicking first), the object rotate to a random direction first which looks odd.

    public Camera cam;
    public float smoothAngle, dragPower = .3f;
    public bool isRadial = true;
    float angle, angleOld, angleDelta, angleRef;
    Vector2 mousePosOld, mousePosDelta = Vector2.zero;

    void Update()
    {



        Vector2 mousePos = cam.ScreenToWorldPoint(Input.mousePosition);
        if (Input.GetMouseButton(0))
        {
            
                
            
            mousePosDelta = mousePos - mousePosOld; 
            float rotX = (mousePosDelta.magnitude / Time.deltaTime) * dragPower * -Mathf.Sign(mousePos.y) * Mathf.Sign(Vector2.Dot(Vector2.right, mousePosDelta));
                
            transform.Rotate(Vector3.forward, rotX);
                
            
            mousePosOld = mousePos;
            angleDelta = Mathf.DeltaAngle(angleOld, transform.localEulerAngles.z);
            angleOld = transform.localEulerAngles.z;

            
        }
        else
        {
            transform.RotateAround(transform.position, transform.forward, angleDelta);
            angleDelta = Mathf.SmoothDampAngle(angleDelta, 0, ref angleRef, smoothAngle);
        }

    }

    Vector2 rotated2D(Vector2 V, float a)
    {
        return new Vector2(V.x * Mathf.Cos(a) - V.y * Mathf.Sin(a), V.x * Mathf.Sin(a) + V.y * Mathf.Cos(a));
    }

I'm trying to do drag to rotate sort of thing, so far the code is fine. However when starting to drag (left clicking first), the object rotate to a random direction first which looks odd.

public Camera cam;
public float smoothAngle, dragPower = .3f;
public bool isRadial = true;
float angle, angleOld, angleDelta, angleRef;
Vector2 mousePosOld, mousePosDelta = Vector2.zero;

void Update()
{
  Vector2 mousePos = cam.ScreenToWorldPoint(Input.mousePosition);
  if (Input.GetMouseButton(0))
  {
    mousePosDelta = mousePos - mousePosOld; 
    float rotX = (mousePosDelta.magnitude / Time.deltaTime) 
                  * dragPower 
                  * -Mathf.Sign(mousePos.y) 
                  * Mathf.Sign(Vector2.Dot(Vector2.right, mousePosDelta));
      
    transform.Rotate(Vector3.forward, rotX);
    
    mousePosOld = mousePos;
    angleDelta = Mathf.DeltaAngle(angleOld, transform.localEulerAngles.z);
    angleOld = transform.localEulerAngles.z;
  }
  else
  {
    transform.RotateAround(transform.position, transform.forward, angleDelta);
    angleDelta = Mathf.SmoothDampAngle(angleDelta, 0, ref angleRef, smoothAngle);
  }
}

Vector2 rotated2D(Vector2 V, float a)
{
  return new Vector2(
      V.x * Mathf.Cos(a) - V.y * Mathf.Sin(a), 
      V.x * Mathf.Sin(a) + V.y * Mathf.Cos(a));
}