三个JS通过绝对值改变向量长度 [英] THREE JS change vector length by absolute value

问题描述

我有两个 Vector3 点 A 和 B.

I have two Vector3 points A and B.

我想将向量 C 放置在从 A 到 B 的轨迹路径上，但将其长度增加 100 品脱.

I want to get vector C placed of trajectory path from A to B, but add to it 100 pint to his length.

我如何计算这个向量?

推荐答案

你可以通过 len 的长度在three.js 中增加一个非零长度的向量，如下所示:

You can increment a non-zero-lenth vector in three.js by length len like so:

var oldLength = vector.length();

if ( oldLength !== 0 ) {

    vector.multiplyScalar( 1 + ( len / oldLength ) );

}

所以，这里是你如何计算点C.

So, here is how you compute the point C.

var A = new THREE.Vector3( 10, 20, 30 );
var B = new THREE.Vector3( 20, 30, 40 );
var C = new THREE.Vector3();

var len = 10;

C.subVectors( B, A ).multiplyScalar( 1 + ( len / C.length() ) ).add( A );

three.js r.69

three.js r.69

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