在两个向量之间进行线性插值。
使用插值 t 在向量 a 和 b 之间进行插值。这最常用于查找占两个端点之间距离特定百分比的点（例如，以便在这些点之间逐步移动对象）。
当 t = 0 时返回 t。
当 t = 1 时返回 t。
当 t = 0.5 时返回 a 和 b 中间的点。
另请参阅：Lerp。
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