UE4で真下を向くとチカチカする！！
今回解決する問題
このように、「カメラが真下を向くと点滅してしまう！」という問題に遭遇した方へ向けた記事となります。
・Step1 PlayerCameraManager
まず初めに、ContentBrowserで右クリックし、PlayerCameraManagerと入力します。ここで出てきたPlayerCameraManagerを作成してください。
今回はBP_CameraManagerという名前を付けました。
これをダブルクリックし、画面右のDetailsタブを見てください。
「ViewPitchMin」「ViewPitchMax」という項目を設定します。
ViewPitchMinは”どれだけ下を向けるか”
ViewPitchMaxは”どれだけ上を向けるか” を設定できます。
設定し終わったらCompileしてください。
・Step2 PlayerController
続いて、PlayerControllerを作成します。
これはBP_PlayerControllerと名付けました。
これもダブルクリックで開いてください。
・Step3 適用
最後に、今まで作成してきたものを適用していきます。
Step2で開いたBP_PlayerControllerのPlayerCameraManagerClassに、Step1で作成したBP_CameraManagerを割り当て、Compileしてください。
そして本当に最後の設定です。
ProjectSettingsのPlayerControllerClassに、Step2のBP_PlayerControllerを割り当ててください。
・結果
これを実行すると……
カメラの回転に制限がかかり、カメラの点滅がなくなりました！
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Unityで角度に制限をかける方法
今回は知らないと躓くかもしれない、Unityで回転を加える際に制限をかける方法を説明します。
原理
早速ですがコードの紹介です。
見慣れない書き方だと思う人もいるかもしれませんので、19行目の説明をします。
まず、
bool型 ? a : b ;
この形は、「もしbool型がTrueならばa(左)、Falseならばb(右)」という処理になります。if文で書くと、こうなります。
目で見てわかるほどコードの量が減るため、if文を書くのが面倒くさいという場合にお勧めです。ただし、今回のように2重にする場合等はカッコで括るなどしないと分かりづらくなってしまいます。
さて、続いては19行目の中身を解説していきます。と言っても、if分で書かれた内容から推察できてしまうかもしれません。そんな方は、この先の内容が自らの考えと一致しているか確認程度で見てください。
わざわざここまで面倒くさくしているのは、
回転する際の値が原因
です。これを見ている人は、制限をかけるとどうしても変な角度になってしまうと思います。それは、皆さんが考えている値と実際に回転する際の値が異なっていることに起因します。
まずは次の画像を見てください。
これがスクリプトで実際に計算しているときの回転の値となるわけですが、インスペクター上では0°から下げていくとマイナスになっていきます。このインスペクターの値を見て制限をかける際に 「-80 < x < 80」 のようにしてしまうと、予期しない挙動になってしまうわけです。そのため、このコードでは「280 < x < 360」と「0< x < 80」のように2段階に分けて処理を行っています。
これさえ理解してしまえば、上記のコードと図を参考に、自由に回転に制限をかけることが出来ます。
[rakuten:book:20351971:detail]
