VR_FollowingHUD.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using NewtonVR;

public class FollowingHUD : MonoBehaviour {
    public enum FollowingType
    {
        /// <summary>바로바로 따라옴</summary>
        Immediate,
        /// <summary>등속 이동</summary>
        Uniform,
        /// <summary>비등속 이동</summary>
        Accel
    }

    public float distanceFromEye = 5;
    public float uniformSpeed = 2;
    public float accelSpeed = 0.12f;

    public FollowingType type = FollowingType.Accel;

	void LateUpdate () {
        var head = NVRPlayer.Instance.Head;

        transform.eulerAngles = head.transform.eulerAngles;

        if (type == FollowingType.Immediate)
            transform.position = GetTargetPosition();
        else if (type == FollowingType.Accel)
            transform.position += (GetTargetPosition() - transform.position) * accelSpeed;
        else
        {
            var diff = (GetTargetPosition() - transform.position);
            var diffNorm = diff.normalized;

            if (diff.sqrMagnitude <= 0.01f) return;

            transform.position += diffNorm * Time.deltaTime * uniformSpeed;
        }
	}

    private Vector3 GetTargetPosition()
    {
        var head = NVRPlayer.Instance.Head;

        return head.transform.position + head.transform.forward * distanceFromEye;
    }
}