[유니티 스크립트 소스] 마우스를 이용한 Orbit 카메라

마우스를 이용하여, 선택한 오브젝트 주위를 회전하거나 줌인, 줌아웃이 되는 카메라입니다.

유니티에서 FreeLookCamera가 있긴 하지만, 이 소스가 더 간단합니다.

 

using UnityEngine;

[RequireComponent(typeof(Camera))]
public class OrbitCamera : MonoBehaviour
{
    public Transform m_Target;
    public float m_Distance = 5.0f;
    public float m_XSpeed = 120.0f;
    public float m_YSpeed = 120.0f;

    public float m_YMinLimit = -20f;
    public float m_YMaxLimit = 80f;

    public float m_DistanceMin = .5f;
    public float m_DistanceMax = 15f;
     
    private float m_X = 0.0f;
    private float m_Y = 0.0f;

    void Start()
    {
        Vector3 angles = transform.eulerAngles;
        m_X = angles.y;
        m_Y = angles.x;
    }

    void LateUpdate()
    {
        if (m_Target)
        {
            if (Input.GetMouseButton(1))
            {
                m_X += Input.GetAxis("Mouse X") * m_XSpeed * m_Distance * 0.02f;
                m_Y -= Input.GetAxis("Mouse Y") * m_YSpeed * 0.02f;

                m_Y = ClampAngle(m_Y, m_YMinLimit, m_YMaxLimit);
            }

            Quaternion rotation = Quaternion.Euler(m_Y, m_X, 0);

            float distance = Vector3.Distance(m_Target.position, transform.position);
            m_Distance = Mathf.Clamp(m_Distance - Input.GetAxis("Mouse ScrollWheel") * distance, m_DistanceMin, m_DistanceMax);
            
            Vector3 negDistance = new Vector3(0.0f, 0.0f, -m_Distance);
            Vector3 position = rotation * negDistance + m_Target.position;

            transform.rotation = rotation;
            transform.position = position;
        }
    }

    public float ClampAngle(float angle, float min, float max)
    {
        if (angle < -360F)
            angle += 360F;

        if (angle > 360F)
            angle -= 360F;
        return Mathf.Clamp(angle, min, max);
    }
}