Question

在哪里可以更改three.js中的缩放方向？我想放大鼠标光标的方向，但我无法改变缩放目标。

Answer 1

更新了wetwipe的解决方案，以支持Three.js的第71版，并将其清理一下，就像一个魅力，请参阅http://www.tectractys.com/market_globe.html获取完整用法示例：

mX = ( event.clientX / window.innerWidth ) * 2 - 1;
mY = - ( event.clientY / window.innerHeight ) * 2 + 1;
var vector = new THREE.Vector3(mX, mY, 1 );
vector.unproject(camera);
vector.sub(camera.position);
camera.position.addVectors(camera.position,vector.setLength(factor));
controls.target.addVectors(controls.target,vector.setLength(factor));

Answer 2

OK！我解决了这个问题......只需禁用THREEJS提供的缩放功能。

controls.noZoom = true;

$('body').on('mousewheel', function (e){

        var mouseX = (e.clientX - (WIDTH/2)) * 10;
        var mouseY = (e.clientY - (HEIGHT/2)) * 10;

        if(e.originalEvent.deltaY < 0){ // zoom to the front
            camera.position.x -= mouseX * .00125;
            camera.position.y += mouseY * .00125;
            camera.position.z += 1.1 * 10;
            controls.target.x -= mouseX * .00125;
            controls.target.y += mouseY * .00125;
            controls.target.z += 1.1 * 10;
        }else{                          // zoom to the back
            camera.position.x += mouseX * .00125;
            camera.position.y -= mouseY * .00125;
            camera.position.z -= 1.1 * 10;
            controls.target.x += mouseX * .00125;
            controls.target.y -= mouseY * .00125;
            controls.target.z -= 1.1 * 10;
        }
});

我知道它并不完美......但我会跳过它会帮助你一点......无论如何......我会努力让它变得更好。

Answer 3

所以我最近遇到了类似的问题，但我需要缩放才能应用于更广阔的空间。我在他的解决方案中采用了Niekes提供的代码，并提出以下内容：

container.on('mousewheel', function ( ev ){

        var factor = 10;

        var WIDTH = window.innerWidth;
        var HEIGHT = window.innerHeight;

        var mX = ( ev.clientX / WIDTH ) * 2 - 1;
        var mY = - ( ev.clientY / HEIGHT ) * 2 + 1;

        var vector = new THREE.Vector3(mX, mY, 1 );
        projector.unprojectVector( vector, camera );
        vector.sub( camera.position ).normalize();

        if( ev.originalEvent.deltaY < 0 ){
            camera.position.x += vector.x * factor;
            camera.position.y += vector.y * factor;
            camera.position.z += vector.z * factor;
            controls.target.x += vector.x * factor;
            controls.target.y += vector.y * factor;
            controls.target.z += vector.z * factor;
        } else{
            camera.position.x -= vector.x * factor;
            camera.position.y -= vector.y * factor;
            camera.position.z -= vector.z * factor;
            controls.target.x -= vector.x * factor;
            controls.target.y -= vector.y * factor;
            controls.target.z -= vector.z * factor;
        }
});

它不漂亮，但至少是功能性的。欢迎改进：）

Answer 4

我对Three.js来说是全新的，但它很精彩。我甚至都不是一个好的开发者。我正在练习。我正面临着缩放到鼠标位置的问题，我想我改进了一点代码。这是。

// zooming to the mouse position
window.addEventListener('mousewheel', function (e) { mousewheel(e); }, false); 
function mousewheel(event) {
    orbitControl.enableZoom = false;
    event.preventDefault();

    // the following are constants depending on the scale of the scene
    // they need be adjusted according to your model scale  
    var factor = 5; 
    // factor determines how fast the user can zoom-in/out  
    var minTargetToCameraDistanceAllowed = 15; 
    // this is the minimum radius the camera can orbit around a target. 

    // calculate the mouse distance from the center of the window
    var mX = (event.clientX / window.innerWidth) * 2 - 1;
    var mY = -(event.clientY / window.innerHeight) * 2 + 1;
    var vector = new THREE.Vector3(mX, mY, 0.5);

    vector.unproject(camera);
    vector.sub(camera.position);

    if (event.deltaY < 0) { 
        // zoom-in -> the camera is approaching the scene
        // with OrbitControls the target is always in front of the camera (in the center of the screen)
        // So when the user zoom-in, the target distance from the camera decrease.
        // This is achieved because the camera position changes, not the target.
        camera.position.addVectors(camera.position, vector.setLength(factor));
    } else { 
        // zoom-out -> the camera is moving away from the scene -> the target distance increase
        camera.position.subVectors(camera.position, vector.setLength(factor));
    }
    // Now camera.position is changed but not the control target. As a result: 
    //  - the distance from the camera to the target is changed, and this is ok.
    //  - the target is no more in the center of the screen and needs to be repositioned. 
    // The new target will be in front of the camera (in the direction of the camera.getWorldDirection() )
    // at a suitable distance (no less than the value of minTargetToCameraDistanceAllowed constant).
    // Thus, the target is pushed a little further if the user approaches too much the target.
    var targetToCameraDistance = Math.max(minTargetToCameraDistanceAllowed, 
                                            orbitControl.target.distanceTo(camera.position));
    var newTarget = camera.getWorldDirection().setLength( targetToCameraDistance ).add(camera.position);
    orbitControl.target = newTarget;

    camera.updateProjectionMatrix();

}

另一个改进可能是将targetToCameraDistance设置为当用户开始轨道运行时鼠标击中的物体的距离。
如果鼠标击中一个物体，并且距离> minTargetToCameraDistanceAllowed，然后计算并设定新目标 ......但我仍然不知道如何做到这一点。

Answer 5

从未听说过缩放方向，

你可能想检查相机的FOV参数，

以及调用此方法来应用更改：

yourCam.updateProjectionMatrix();

Answer 6

如果您使用轨迹球控件，请设置

trackBallControls.noZoom=true;

并在mousewheel事件中使用此代码，

mousewheel = function (event) {

            event.preventDefault();
            var factor = 15;
            var mX = (event.clientX / jQuery(container).width()) * 2 - 1;
            var mY = -(event.clientY / jQuery(container).height()) * 2 + 1;
            var vector = new THREE.Vector3(mX, mY, 0.1);

            vector.unproject(Camera);
            vector.sub(Camera.position);
            if (event.deltaY < 0) {
                Camera.position.addVectors(Camera.position, vector.setLength(factor));
                trackBallControls.target.addVectors(trackBallControls.target, vector.setLength(factor));
                Camera.updateProjectionMatrix();
            } else {
                Camera.position.subVectors(Camera.position, vector.setLength(factor));
                trackBallControls.target.subVectors(trackBallControls.target, vector.setLength(factor));

            }

        };

在三个JS中缩放到对象

6 个答案: