这是 XRSettings.StereoRenderingMode.SinglePass 模式的一种优化版本。
场景图仅遍历一次，并且每个渲染节点只发出一个实例化绘制调用，从而减少渲染场景所需的带宽。场景剔除和阴影贴图渲染在两只眼睛之间共享。主渲染目标必须是渲染目标数组。此模式需要特殊的硬件支持才能运行。有关如何充分利用实例化渲染的信息，请参阅手册。其他资源：XRSettings.stereoRenderingMode。
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