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Oculus Guardian システムは、VR インタラクション エリアの境界をユーザーに表示します。トラックされたデバイスが境界に近づくと、Oculus Runtime が自動的に視覚的なヒントを出してユーザーに知らせます。この操作ガイドでは、デバイスの 1 つがインタラクション エリアに接近またはエリア外に出たことをユーザーに知らせる視覚的ヒントとインタラクションの表示方法を説明します。

ステップ

1. Oculus Rift Boundary を表示するには、まずユーザーのデバイスが範囲に近づくタイミングを知る必要があります。 Is Outer Boundary Displayed ノードで行うことができますが、ティックごとに確認しなければなりません。UE4 で行うこともできます。まず、以下のノードをイベントグラフに追加します。

   ノード名	値
   Event Tick	N/A
   Branch	N/A
   Is Outer Boundary Displayed	N/A
   Oculus Rift Boundary	N/A

2. Is Outer Boundary Displayed ノードがユーザーのデバイスが境界に接近した時だけ呼び出され、それ以外は何も起きないように、イベントグラフを以下の画像と同じになるように接続します。

   クリックしてフルサイズで表示

3. 次に、ユーザーが Oculus App で設定した境界だけでなく、これらの境界内にフィットする四角いインタラクション エリアも表示されるようにします。まず Get Play Area Points ノードを使って、プレイ エリア内のすべてのポイントを調べます。そして、四角いインタラクション エリアの大きさを判断するために、 For Loop を使って各ポイントを調べます。各ポイントで点を描画し、それらを線でつなげてユーザーにこの情報を表示します。イベントグラフを以下の画像と同じになるように接続します。

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       End Object
       Begin Object Class=K2Node_CallArrayFunction Name="K2Node_CallArrayFunction_16"
          bIsPureFunc=True
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       End Object
       Begin Object Class=K2Node_CallFunction Name="K2Node_CallFunction_970"
          FunctionReference=(MemberParent=Class'/Script/Engine.KismetSystemLibrary',MemberName="DrawDebugPoint")
          NodePosX=2320
          NodePosY=-480
          NodeGuid=13548C7549C296F678A27F8D67E9C576
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       End Object
       Begin Object Class=K2Node_CallFunction Name="K2Node_CallFunction_971"
          FunctionReference=(MemberParent=Class'/Script/Engine.KismetSystemLibrary',MemberName="DrawDebugLine")
          NodePosX=2608
          NodePosY=-304
          NodeGuid=1CCED43144BB32BA3C6332B6C3872B5A
          EnabledState=DevelopmentOnly
          CustomProperties Pin (PinId=2C80F14646574BCD89C88681C0CD95CC,PinName="execute",PinToolTip="\nExec",PinType.PinCategory="exec",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(K2Node_CallFunction_970 5CCCAED249A381CA5387F0B65B573277,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
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          CustomProperties Pin (PinId=AD09356A4D6E12DEB6874EAB7A066595,PinName="self",PinFriendlyName=NSLOCTEXT("K2Node", "Target", "Target"),PinToolTip="Target\nKismet System Library Reference",PinType.PinCategory="object",PinType.PinSubCategory="",PinType.PinSubCategoryObject=Class'/Script/Engine.KismetSystemLibrary',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,DefaultObject="/Script/Engine.Default__KismetSystemLibrary",PersistentGuid=00000000000000000000000000000000,bHidden=True,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
          CustomProperties Pin (PinId=353C68CE4F2B2D72ADDAEBA325715F00,PinName="WorldContextObject",PinToolTip="World Context Object\nObject Reference",PinType.PinCategory="object",PinType.PinSubCategory="",PinType.PinSubCategoryObject=Class'/Script/CoreUObject.Object',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=True,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
          CustomProperties Pin (PinId=459C46264271A2417FAABDAED1C20724,PinName="LineStart",PinToolTip="Line Start\nVector ",PinType.PinCategory="struct",PinType.PinSubCategory="",PinType.PinSubCategoryObject=ScriptStruct'/Script/CoreUObject.Vector',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=True,PinType.bIsWeakPointer=False,DefaultValue="0, 0, 0",AutogeneratedDefaultValue="0, 0, 0",LinkedTo=(K2Node_CallArrayFunction_16 807DD0AC440EB715E49E72ABE52ABBB5,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
          CustomProperties Pin (PinId=EB02B76B45333DD21AF3A2B5B4F3E367,PinName="LineEnd",PinToolTip="Line End\nVector ",PinType.PinCategory="struct",PinType.PinSubCategory="",PinType.PinSubCategoryObject=ScriptStruct'/Script/CoreUObject.Vector',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=True,PinType.bIsWeakPointer=False,DefaultValue="0, 0, 0",AutogeneratedDefaultValue="0, 0, 0",LinkedTo=(K2Node_CallArrayFunction_17 807DD0AC440EB715E49E72ABE52ABBB5,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
          CustomProperties Pin (PinId=F46FC3744B82648A65ABC8BB8C6323BC,PinName="LineColor",PinToolTip="Line Color\nLinear Color Structure",PinType.PinCategory="struct",PinType.PinSubCategory="",PinType.PinSubCategoryObject=ScriptStruct'/Script/CoreUObject.LinearColor',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,DefaultValue="(R=1.000000,G=0.014920,B=0.000000,A=1.000000)",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
          CustomProperties Pin (PinId=C2B19A7E453BE596D4D31EAC0782E5DD,PinName="Duration",PinToolTip="Duration\nFloat",PinType.PinCategory="float",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,DefaultValue="0",AutogeneratedDefaultValue="0.000000",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
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       End Object
       Begin Object Class=EdGraphNode_Comment Name="EdGraphNode_Comment_3"
          NodePosX=608
          NodePosY=-560
          NodeWidth=2192
          NodeHeight=480
          NodeComment="Draw the play area"
          NodeGuid=5D41106C4E1F47307BF07AAC129F72E9
       End Object
   END OBJECT

   画像をクリックしてブループリント コードをコピー

4. For Loop が Branch ノードの True 出力に接続されていることを確認してください。ブループリントを必ずコンパイルおよび保存してください。こちらが完成したブループリントのイベントグラフです。

   クリックしてフルサイズで表示

最終結果

では Oculus Rift HMD を装着してタッチ コントローラーを持って、VR Review でプロジェクトを起動してみましょう。プロジェクトが起動したら、いずれかのタッチ コントローラーをガーディアン境界に向けてゆっくり動かします。以下の動画のように、ガーディアン境界が表示されると、四角いインタラクション エリアも表示されるようになります。

UE4 プロジェクトのダウンロード

以下のリンクから、このサンプルの作成に使われた UE4 プロジェクトをダウンロードすることができます。

• Oculus Rift ガーディアン システム設定プロジェクト