三.JS：沿方向向量获取位置

Question

我有一个位置向量：

var startPos = new THREE.Vector3(1.2, -2.34, 0.5);

方向向量：

var direction = new THREE.Vector3(0.657873735, -0.2497291683, 0.71051916);

还有一段距离：

var distance = 1;

如何计算一个新的位置向量，从startPos开始沿着direction移动distance？

Answer 1

var startPos = new THREE.Vector3(1.2, -2.34, 0.5);
var direction = new THREE.Vector3(0.6578737359955765, -0.24972916834682138, 0.710519166466616);
var distance = 1;

var newPos = new THREE.Vector3();
newPos.addVectors ( startPos, direction.multiplyScalar( distance ) );