向单个双宽渲染目标的左半部和右半部渲染立体。
在并排单通道立体渲染中，渲染管线只遍历场景图一次且针对每个渲染节点发出两次绘制调用。将每只眼睛渲染到渲染目标的一侧。主渲染目标的宽度必须是单眼目标的两倍。场景剔除和阴影贴图渲染在两眼之间处于共享状态。对于 VR 而言，并排渲染比多通道渲染快得多，但比实例化或多视图模式慢一些。
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