Define the orientation of the the floor plane with respect to the X,Y,Z axes, and which axes represent the side, front and up vectors as a basis for rotations in Wwise. AkFloorPlane is used in to orient the Game Object 3D Viewer in Wwise, and in the transformation of geometry instances in Wwise Spatial Audio. 
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| AkFloorPlane_XZ  | The floor is oriented along the ZX-plane. The front vector points towards +Z, the up vector towards +Y, and the side vector towards +X.  
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| AkFloorPlane_XY  | The floor is oriented along the XY-plane. The front vector points towards +X, the up vector towards +Z, and the side vector towards +Y.  
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| AkFloorPlane_YZ  | The floor is oriented along the YZ-plane. The front vector points towards +Y, the up vector towards +X, and the side vector towards +Z.  
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| AkFloorPlane_Default  | The Wwise default floor plane is ZX.  
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 AkSoundEngine.h の 170 行目に定義があります。