在两个向量之间进行线性插值。
通过插值因子 t 在向量 a 和 b 之间进行插值。这最常用于查找两端点之间线段上某个分数位置的点（例如，逐步移动对象到这些点之间）。
当 t = 0 时返回 a。当 t = 1 时返回 b。当 t = 0.5 时返回 a 和 b 之间的中点。
其他资源：Lerp。
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