关于vr物理相机的film gate提个问题，专业摄影的也可以帮忙回答

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Film gate - specifies the horizontal size of the film gate in millimeters. Note that this setting takes into account the system units configuration to produce the correct result. Vertical film gate size is calculated by accounting image aspect ratio (vertical film size = horizontal film size / aspect ratio).按照官方帮助文档的说法应该是指横向长度，你说的问题我也一直很困扰