用于混合的探针周围距离（在延迟探针中使用）。
使用延迟着色时，反射探针是以逐像素的方式渲染的（而不是一个或两个探针影响整个对象）。混合距离控制探针相互混合的方式；本质上就是探针混合区域的大小。默认混合距离为 1.0。
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