射线与平面的交点坐标 [英] Coordinates of intersection between Ray and Plane

问题描述

我有射线和飞机.射线与平面相交，我想知道在哪里.我如何获得这个 interset 的世界坐标?

I have got a ray and a plane. The ray is intersecting the plane and I would like to know where. How do I get the world-coordinates of this intersetion?

(在我的特殊情况下，我将屏幕坐标取消投影到相机并创建光线.平面是场景的地面)

(My particular case I unproject screen-coordinates to the camera and create the ray. The plane is the ground of the scene)

var vector = new THREE.Vector3( mousePosition.x, mousePosition.y, 1 );
projector.unprojectVector( vector, camera );
var ray = new THREE.Ray(
    camera.position,
    vector.subSelf( camera.position ).normalize()
);

推荐答案

这是通常的模式.您可能需要对其进行调整以适应您的特定情况.

This is the usual pattern. You may have to adapt it to fit your particular situation.

var raycaster = new THREE.Raycaster(); // create once and reuse
var mouse = new THREE.Vector2(); // create once and reuse

...

mouse.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
mouse.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;

raycaster.setFromCamera( mouse, camera );

var intersects = raycaster.intersectObjects( objects, recursiveFlag );

if ( intersects.length > 0 ) {

    console.log( intersects[ 0 ].point; );

}

这里，objects 是一个数组.例如，

Here, objects is an array. For example,

var objects = [];

objects.push( plane_mesh );

更新了three.js r.84

Updated for three.js r.84

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