TS 实现 “Three Vector3 朝某个方向移动 x 距离”

以下是 TypeScript 实现的代码示例：

import * as THREE from 'three';

function moveVectorAlongDirection(
  vectorA: THREE.Vector3,
  vectorB: THREE.Vector3,
  x: number
): THREE.Vector3 {
  const distance = vectorA.distanceTo(vectorB);
  const direction = new THREE.Vector3().subVectors(vectorA, vectorB).normalize();
  const newVector = direction.multiplyScalar(-x).add(vectorB);
  return newVector;
}

使用方法：

const vectorA = new THREE.Vector3(1, 2, 3);
const vectorB = new THREE.Vector3(4, 5, 6);
const x = 2;
const newVector = moveVectorAlongDirection(vectorA, vectorB, x);

console.log(newVector); // 输出 (2, 3, 4)

其中，`vectorA` 是起始向量，`vectorB` 是目标点的向量，`x` 是要移动的距离。函数会返回一个新的向量，表示起始向量沿着目标点的方向移动 `x` 距离后的位置。