Converting World coordinates to Screen coordinates in Three.js using Projection

CommunityBishopZ提出了一个问题：Converting World coordinates to Screen coordinates in Three.js using Projection，或许与您遇到的问题类似。

回答者mrdoob给出了该问题的处理方式：

Try with this:

var width = 640, height = 480;
var widthHalf = width / 2, heightHalf = height / 2;

var vector = new THREE.Vector3();
var projector = new THREE.Projector();
projector.projectVector( vector.setFromMatrixPosition( object.matrixWorld ), camera );

vector.x = ( vector.x * widthHalf ) + widthHalf;
vector.y = - ( vector.y * heightHalf ) + heightHalf;

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