斜方投射で頂点座標に達した時の座標の予測

Test2

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

public class Test2 : MonoBehaviour {

	[SerializeField]
	private Vector3 vec;
	[SerializeField]
	private GameObject dummySphere;

	private Rigidbody rigid;
	private bool isShot = false;
	private float timeCnt = 0.0f;
	private float stopTime = 0.0f;

	void Start()
	{
		rigid = GetComponent<Rigidbody>();
		if (!rigid)
		{
			rigid = gameObject.AddComponent<Rigidbody>();
		}
		rigid.isKinematic = true;
		dummySphere.transform.position = transform.position;
	}

	void Update()
	{
		if (Input.GetKeyDown(KeyCode.Space))
		{
			var t = vec.y / (-Physics.gravity.y);
			stopTime = t;
			var y = transform.position.y + (vec.y * t) - 0.5f * (-Physics.gravity.y) * Mathf.Pow(t, 2.0f);
			var x = transform.position.x + (vec.x * t);
			var z = transform.position.z + (vec.z * t);
			var pos = new Vector3(x, y, z);
			dummySphere.transform.position = pos;
			Debug.Log(t.ToString("F2") + "秒後の座標は" + pos.ToString("F5"));


			rigid.isKinematic = false;
			rigid.AddForce(vec, ForceMode.VelocityChange);
			isShot = true;
			timeCnt = 0.0f;
		}

		if (!isShot)
			return;

		timeCnt += Time.deltaTime;
		if (timeCnt >= stopTime)
		{
			isShot = false;
			Debug.Log("予測との誤差：" + Vector3.Distance(transform.position, dummySphere.transform.position).ToString("F5"));
			Debug.Break();
		}
	}
}