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バーチャルキャストの
The Looking Glass対応と
その実装上の工夫
MIRO (Twitter: @MobileHackerz)
バーチャルキャストとは
• バーチャルキャラクターになってVR空間で生放送が可能な
「VRライブ・コミュニケーションサービス」
• コメントで生放送視聴者とコミュニケーションが可能
• 「凸機能」で他の配信者のスタジオへ遊びに行ける
• 2018年4月13日サービス開始
バーチャルキャストの
The Looking Glass対応について
2019/2/7 Version 1.4.8a
• 公式にThe Looking Glass表示をサポート
• 「ダイレクトビューモード」かつ「LookingGlass表示」のときに
LookingGlass対応モードになる
• Config.jsonという設定ファイルに下記設定を記述する必要があ
る
「ダイレクトビューモード」とは
• バーチャルキャストは、VR機器を用いて「スタジオ」に入り、ライ
ブ・コミュニケーションを楽しむサービス
• ほかの人の「スタジオ」に「凸(とつ)」(=訪問)することで、
複数人の遠隔VRコミュニケーションが可能
• 「ダイレクトビューモード」は、VR機器を使わずに、「凸」をして、
スタジオ内の様子を視聴することができるクライアントモード
• 遠隔地で映像出演するとき(遠隔登壇など)に使われる
• 現在ネットワークの構成上、接続数が増えると配信者に一部負荷が
かかるため明示的に「ダイレクトビューモードの凸を許可」したス
タジオにのみ接続可能
ダイレクトビューモード
通常起動・ダイレクトビュー凸許可
“allow_direct_view” : true
ダイレクトビューモード
“mode” : “direct-view”
「凸」を行う
遠隔表示
The Looking Glass対応版の仕様
• HoloPlay SDKは非常に優秀で、SDKを入れてとりあえず配置すれ
ばそれだけでかなり「それっぽく」見える
ところが…
しかし、単純に配置するだけだと…
• 背景が黒い。Far clipが背景オブジェク
トよりも手前にあるため。
• ではFar clipを遠くすると…?視差がつきす
ぎて遠方はきれいに見えない!
• 写る範囲が狭い。
• 生でキャラクターは縦横無尽に移動する
ためすぐにLooking Glassの表示エリアから
はみ出してしまう
• 写る範囲を広げると、同様に視差がつき
すぎたりしてきれいに見えない
• バーチャルキャストは「生放送」がで
きるプラットフォーム。スタジオを写
すカメラの概念がある。放送中のカメ
ラとLooking Glassの映像の整合性は?
つまり、
• HoloPlay SDKのカメラの初期設定をなるべく活かし
• その中で「立体視が自然にきれいに見える」範囲だけを活用し
• 「生放送用」のスタジオのカメラ映像も楽しみつつ
• 立体視ならではの存在感を楽しむことができる
見せかたが必要!
The Looking Glassの「きれいに見える」
スイートスポットを適切に利用するためには!?
The Looking Glass対応版の仕様解説
• 「これ以上奥はきれいに見えない」スイートスポットの最奥面
に「放送の映像が表示されるパネル」を設置
• ライブステージでLEDを背にしているかのように、放送映像をまず素直
に楽しめるようにする
• スイートスポットよりも奥が見えないように蓋をする役目も
放送映像
The Looking Glass対応版の仕様解説
• その手前に写るよう、スイートスポットにNear/Farが調整され
た(=ほぼデフォルト設定の)HoloPlay カメラを配置
• サイズ感は「キャラクターがそこにミニサイズでいるかのよう」に、
全身が収まるように
• スタジオ内の鏡と同じ向き・角度に写る(正面)
放送映像
立体エリア スタジオ内鏡(正面)
The Looking Glass対応版の仕様解説
• このときHoloPlayカメラ(立体エリア)のスイートスポットは
狭いので、「スタジオのオーナー(メインの演者)」が中央に
収まるようにカメラを配置する
• 演者が移動すると、HoloPlayカメラも自動的に追跡する
放送映像
立体エリア スタジオ内鏡(正面)
The Looking Glass対応版の仕様解説
• ただしThe Looking Glassの中で演者が走り回っている感じは出し
たいのでHoloPlayのカメラ追跡は一定期間平準化し、後からお
いかけてくるような挙動にしている
• また、X,Zは追跡するがYは固定(Looking Glassの下面=床)
放送映像
立体エリア
スタジオ内鏡(正面)
放送コンテンツを楽しむ
+
リアルな箱庭感
+
無理のない立体視を得られる
スイートスポットのみを利用
3Dライブコミュニケーションを
もっと楽しもう!

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LookingGlass勉強会 バーチャルキャストのThe Looking Glass対応とその実装上の工夫