Camera movement automatically tracking a tool over a surface

Question

I need to create camera movement tracking the clipper hair like this:

I already have a script for the movement of the tool.

• I'm using Snapping Player to the Surface of an Object of this pos How could I constrain player movement to the surface of a 3D object using Unity?

    private void UpdatePlayerTransform(Vector3 movementDirection){
    if (GetRaycastDownAtNewPosition(movementDirection, out hitInfo)){
        Quaternion targetRotation = Quaternion.FromToRotation(Vector3.up, hitInfo.normal);
        finalRotation = Quaternion.RotateTowards(transform.rotation, targetRotation, float.PositiveInfinity);
        transform.rotation = Quaternion.Lerp(transform.rotation, finalRotation, Time.deltaTime * smoothTime);
        transform.position = Vector3.Lerp(transform.position, hitInfo.point + hitInfo.normal * .08f, Time.deltaTime * smoothTime);
        }
    }
  
    private bool GetRaycastDownAtNewPosition(Vector3 movementDirection, out RaycastHit hitInfo)
    {
        Vector3 newPosition = transform.position;
        Ray ray = new Ray(transform.position + movementDirection * Speed, -transform.up);
  
        if (Physics.Raycast(ray, out hitInfo, 1f, WorldLayerMask))
            return true;
  
        return false;
  

}

• I'm find move director

    void FindMovementDirVector(){
    try
    {
        float angle = Vector3.Angle(hitInfo.normal, Vector3.up);
        float angleWithForward = Vector3.Angle(hitInfo.normal, Vector3.forward);
        if (angleWithForward < 90 && angle < 60)
        {
            caseName = "Case 1";
  
            if (angleWithForward > 30)
                localForwardDir = Vector3.Lerp(localForwardDir, Vector3.Cross(hitInfo.normal, -Camera.main.transform.right), Time.deltaTime * smoothTime);
            else
                localForwardDir = Vector3.Lerp(localForwardDir, Vector3.Cross(hitInfo.normal, LocalRightDir), Time.deltaTime * smoothTime);
  
            LocalRightDir = Vector3.Lerp(LocalRightDir, Vector3.Cross(-localForwardDir, hitInfo.normal), Time.deltaTime * smoothTime);
        }
        else
        {
            caseName = "Case 2";
            Vector3 to = new Vector3(hitInfo.normal.x + hitInfo.point.x, hitInfo.point.y, hitInfo.normal.z + hitInfo.point.z);
            if (angleWithForward > 35)
                LocalRightDir = Vector3.Lerp(LocalRightDir, Vector3.Cross(to, Vector3.up), Time.deltaTime * smoothTime);
            else
                LocalRightDir = Vector3.Lerp(LocalRightDir, -Vector3.Cross(to, Vector3.up), Time.deltaTime * smoothTime);
            localForwardDir = Vector3.Lerp(localForwardDir, -Vector3.Cross(hitInfo.normal, LocalRightDir), Time.deltaTime * smoothTime);
        }
    }
    catch { }
    }
  

  • Input script

      private void TouchInput(){
      if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved)
      {
          pointer_x = Input.touches[0].deltaPosition.x;
          pointer_y = Input.touches[0].deltaPosition.y;
    
          if (pointer_x > 0)
              movementDirection += LocalRightDir * pointer_x;
          else if (pointer_x < 0)
              movementDirection -= LocalRightDir * Mathf.Abs(pointer_x);
    
          if (pointer_y > 0)
              movementDirection += localForwardDir * pointer_y;
          else if (pointer_y < 0)
              movementDirection -= localForwardDir * Mathf.Abs(pointer_y);
      }}
    

Answer 1

Personally, I would add an empty game object in the middle of the head and have the camera always LookAt() it. Then place another empty game object, as a child of the clippers, and have your camera always move towards it, probably using Vector3.SmoothDamp() (as it will give a bit of easing to the camera movement).

Danny