気体分子に力を与えるスクリプト

GasMolecularMover.cs

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

public class GasMolecularMover : MonoBehaviour {

	public float minSpeed = 20f;
	public float maxSpeed = 30f;
	Vector3 force = Vector3.zero;
	Rigidbody rb;
	bool isShoot;

	void Start(){
		force.x = GetRandomSpeed();
		force.y = GetRandomSpeed();
		force.z = GetRandomSpeed();
		rb = gameObject.GetComponent<Rigidbody>();
	}

	void FixedUpdate(){
		if (!isShoot){
			rb.AddForce(force, ForceMode.VelocityChange);
			isShoot = true;
		}
	}

	float GetRandomSpeed(){
		float speed = 0f;
		speed = Random.Range(minSpeed, maxSpeed);
		return speed;
	}
}