ReadOnlySpan<Vector4> 输入点（以 xyz 形式出现）的非归一化天空可见度。w 组件表示击中背面的光线的比例。
检索自定义烘焙结果。
自定义烘焙计算从输入样本点可见的天空量。此值是通过在每个点的上半球上发射光线来计算的，结果是从每个位置直接线到达天空的样本比例（考虑了透明度）。每条光线都由输入的 w 组件中指定的值进行偏移。结果值是一个浮点数字，存储在 (xyz) 中，不会归一化。可以通过将结果除以用于自定义烘焙的样本数来对值进行归一化。结果的 w 组件表示击中背面的样本比例，可用于检测位于几何形状内部的样本（即它们将具有较高的 w 值）。该数据可以用在自定义着色器中，以解释难以烘焙的物体的天空可见度，例如树木和树叶。这样，位于树冠内部的点（例如）会变得更暗，因为逃逸到天空的光线较少。
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