threejs 世界坐标与屏幕坐标相互转换

Posted 2020-10-21 善未易明

屏幕坐标转世界坐标:

let pX = (screenPoint.x / this.scene.renderer.domElement.clientWidth) * 2 - 1;

let pY = - (screenPoint.y / this.scene.renderer.domElement.clientHeight) * 2 + 1;

 

//通过调用Vector3的unproject()方法(只有vector3能使用)

//注:pX, pY介于 -1 到1之间

let p = new THREE.Vector3(pX, pY, -1).unproject(this.scene.camera)

return  new THREE.Vector2(p.x,p.y);

 

 

世界坐标转屏幕坐标

let projector = new THREE.Projector();  

let world_vector = new THREE.Vector3(0,0,1);  

let vector = projector.projectVector(world_vector,this.scene.camera);  

let halfWidth = window.innerWidth / 2,

　 halfHeight = window.innerHeight / 2;  

return {  

　　x: Math.round(vector.x * halfWidth + halfWidth),  

　　 y: Math.round(-vector.y * halfHeight + halfHeight)  

};