乱数生成器の内部状態のすべてを取得、または、設定します。
このプロパティーは通常、乱数生成器 (RNG) の以前に保存した状態を保存し、復元するために使用されます。 RNG の状態は、Random.InitState 関数を使って種 (シード) 数でイニシアライズすることもできます。しかし、以下の例で示されるように、効果はかなり異なります。
using UnityEngine; using System.Collections;
public class ExampleClass : MonoBehaviour { void Start() { Random.InitState(255);
PrintRandom("Step 1"); PrintRandom("Step 2");
Random.State oldState = Random.state;
PrintRandom("Step 3"); PrintRandom("Step 4");
Random.state = oldState;
PrintRandom("Step 5"); PrintRandom("Step 6");
Random.InitState(255);
PrintRandom("Step 7"); PrintRandom("Step 8"); }
void PrintRandom(string label) { Debug.Log(string.Format("{0} - RandomValue {1}", label, Random.Range(1, 100))); } }
このスクリプトを実行した後、step 5 と 6 からの乱数値は step 3 と 4 からの乱数値と同じになるという状況が見られます。なぜなら、RNG の内部の状態が Random.state プロパティーの仕様によって復元されてしまうからです。 また、Random.InitState が RNG の状態を最初のシード値で再度イニシアライズするため、step 7 と 8 からの乱数値は step 1 と 2 からのものと等しくなります。
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thank you for helping to make the Unity documentation better!
Your feedback has been submitted as a ticket for our documentation team to review.
We are not able to reply to every ticket submitted.