Three.js THREE.Projector已移至

Question

我知道版本71中没有THREE.projector (请参阅不推荐名单)，但我不知道如何替换它，特别是在检测单击哪个对象的代码中：

var vector = new THREE.Vector3(
  (event.clientX / window.innerWidth) * 2 - 1,
  -(event.clientY / window.innerHeight) * 2 + 1,
  0.5
);
projector.unprojectVector(vector, camera);
var raycaster = new THREE.Raycaster(
  camera.position,
  vector.sub(camera.position).normalize()
);
var intersects = raycaster.intersectObjects(objects);
if (intersects.length > 0) {
  clicked = intersects[0];
  console.log("my clicked object:", clicked);
}

Answer 1

现在有了一种更简单的模式，既适用于正射型，也适用于透视相机类型：

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

...

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 );

three.js r.84

Answer 2

实际上，THREE.JS光机文档给出了这些答案中列出的所有相关信息，以及所有可能难以理解的缺失点。

var raycaster = new THREE.Raycaster(); 
var mouse = new THREE.Vector2(); 

function onMouseMove( event ) { 
  // calculate mouse position in normalized device coordinates 
  // (-1 to +1) for both components 
  mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1; 
  mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1; 
} 

function render() { 
  // update the picking ray with the camera and mouse position
  raycaster.setFromCamera( mouse, camera ); 
  // calculate objects intersecting the picking ray var intersects =     
  raycaster.intersectObjects( scene.children ); 

  for ( var i = 0; i < intersects.length; i++ ) { 
    intersects[ i ].object.material.color.set( 0xff0000 ); 
  }

  renderer.render( scene, camera ); 
} 
window.addEventListener( 'mousemove', onMouseMove, false );        
window.requestAnimationFrame(render);`

希望能帮上忙。

Answer 3

https://github.com/mrdoob/three.js/issues/5587

var vector = new THREE.Vector3();
var raycaster = new THREE.Raycaster();
var dir = new THREE.Vector3();

...

if ( camera instanceof THREE.OrthographicCamera ) {

    vector.set( ( event.clientX / window.innerWidth ) * 2 - 1, - ( event.clientY / window.innerHeight ) * 2 + 1, - 1 ); // z = - 1 important!

    vector.unproject( camera );

    dir.set( 0, 0, - 1 ).transformDirection( camera.matrixWorld );

    raycaster.set( vector, dir );

} else if ( camera instanceof THREE.PerspectiveCamera ) {

    vector.set( ( event.clientX / window.innerWidth ) * 2 - 1, - ( event.clientY / window.innerHeight ) * 2 + 1, 0.5 ); // z = 0.5 important!

    vector.unproject( camera );

    raycaster.set( camera.position, vector.sub( camera.position ).normalize() );

}

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

Objects = Object3D类型的对象数组，以检查与光线的交集。可能是你场景中的一切，但如果你有很多东西的话，可能效率很低。

recursiveFlag =如果为真，它也会检查所有的后代。否则，它只检查与对象的交集。默认值是真的。

文档