THREE.js 检查对象是否为平截头体 [英] THREE.js check if object is in frustum

问题描述

我一直在修改three.js，我有一个画布，我想用作一种GUI.为此，我必须检查一个物体是否在相机视锥中.

i've been tinkering around with three.js and i have a canvas i'd like to use as kind of a GUI. for that i have to check if an object is in the camera frustum.

我当前的代码:

camera.updateMatrix(); 
camera.updateMatrixWorld(); 
        
var frustum = new THREE.Frustum();
var projScreenMatrix = new THREE.Matrix4();
projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
        
frustum.setFromProjectionMatrix( camera.projectionMatrix );
        
if(frustum.containsPoint( mesh.position )){
    //stuff happens...
};

frustum.containsPoint() 一直返回 false.我在这里做错了什么?

frustum.containsPoint()keeps returning false. what am i doing wrong here?

推荐答案

您的代码正在使用

frustum.setFromMatrix( camera.projectionMatrix );

但这不是您想要的矩阵.而是使用:

But that isn't the matrix you want. Instead use:

frustum.setFromMatrix( new THREE.Matrix4().multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse ) );

如如何确定飞机在 Three.js 相机 Frustum 中

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