应用于每个平台的标准遮挡遮罩的比例。
遮挡遮罩不会渲染到无法通过 XR 头盔看到的像素，从而提高性能。一些后期处理效果需要无法通过 XR 头盔的受限视野（例如模糊效果）看到的像素数据，以避免视觉瑕疵和其他显示错误。此属性可以扩展遮挡遮罩，以确保渲染到 XR 头盔视野外的像素，从而允许后期处理效果访问所需的纹理数据。由于渲染了额外像素，扩展遮挡遮罩将导致 GPU 性能损失。
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