CameraCollision for Unity

CameraCollision.cs

public class CameraCollision : MonoBehaviour
{
  private Vector3 _dollyDirection;
  private Vector3 _dollyDirectionAdjusted;
  private float _distance;
  
  public float MinDistance = 1.0f;
  public floar MaxDistance = 4.0f;
  public float Smooth = 1.0f;

  private void Awake()
  {
    _dollyDirection = transform.localPosition.normalized;
    _distance= transform.localPosition.magnitude;
  }

  private void Update()
  {
    var desiredCameraPosition = transform.parent.TransformPoint(_dollyDirection * MaxDistance);
    RaycastHit hit;

    if (Physics.Linecast())
    {
        _distance = Mathf.Clamp(hit.Distance * 0.9f), MinDistance, MaxDistance);
    }
    else
    {
        _distance = MaxDistance;
    }

    transform.localPosition = Vector3.Lerp(transform.localPosition, _dollyDirection * _distance, Time.deltaTime * Smooth)
  }
}