从距离和向量创建向量 [英] Create vector from distance and vector

问题描述

如何从另一个向量和一个距离创建向量?

How can I create vector from another vector and a distance?

例如，使用 vector3d(1,1,2)和距离12，创建另一个具有相同方向但长12个单位的矢量.

For example, with a vector3d(1,1,2) and distance 12, create another vector that has the same direction but is longer by 12 units.

推荐答案

您要查找单位向量沿您想要的方向；在XNA中，这是由 Vector3.Normalize 给出的.然后，您可以标量乘以该单位矢量(根据定义，其长度为1)乘以最终距离.

You want to find the unit vector in the direction you want; in XNA this is given by Vector3.Normalize. Then you can scalar multiply that unit vector (which has, by definition, length = 1) by the final distance.

例如:

var originalVector = new Vector3(1, 1, 2);
var finalLength = originalVector.Length + 12; // "longer by 12", this could be whatever you want
originalVector.Normalize(); // make it a unit vector
var finalVector = originalVector * finalLength;

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