Question

我正在开发一个3d虚拟家庭项目。除碰撞检测外，每件事情都很好。我使用PointerLockControls来进行相机和移动。但我不确定如何在每个可能的方向上发现碰撞。为简单起见，我开始只是向前和向后碰撞到（0,0,0）上的一个简单立方体：

rays = [
    new THREE.Vector3(0, 0, 1),
    new THREE.Vector3(0, 0, -1)
];

然后：

function detectCollision() {
var vector;
var projector = new THREE.Projector();

for (var i = 0; i < rays.length; i++) {
    var vector = rays[i].clone();
    projector.unprojectVector(vector, camera);

    var rayCaster = new THREE.Raycaster(controls.getObject().position, vector.sub(controls.getObject().position).normalize());
    var intersects = rayCaster.intersectObject(cube, true);

    if (intersects.length > 0 && intersects[0].distance < 50) {
        console.log(vector);
        console.log(i, intersects);
        $("#status").text("Collision detected @ " + rays[i].x + "," + rays[i].z +
            "<br \>" + intersects[0].distance);
    }
}

但是当我接近我的立方体时，控制台会向我显示两条射线都撞到了立方体！所以为什么？我的光线有问题吗？ vector（0,0,1）应该是向后的，而（0,0，-1）应该是向前的，对吗？在我迷路之前请帮助我！感谢。

Answer 1

最后我发现!!解决方案。我不擅长数学，但最后我明白了在我从指针锁定器控件获取方向后，依赖于按下哪个键，我将方向放入旋转矩阵以获得实际方向向量（感谢线索Icemonster）：

function detectCollision() {
unlockAllDirection();

var rotationMatrix;
var cameraDirection = controls.getDirection(new THREE.Vector3(0, 0, 0)).clone();

if (controls.moveForward()) {
    // Nothing to do!
}
else if (controls.moveBackward()) {
    rotationMatrix = new THREE.Matrix4();
    rotationMatrix.makeRotationY(180 * Math.PI / 180);
}
else if (controls.moveLeft()) {
    rotationMatrix = new THREE.Matrix4();
    rotationMatrix.makeRotationY(90 * Math.PI / 180);
}
else if (controls.moveRight()) {
    rotationMatrix = new THREE.Matrix4();
    rotationMatrix.makeRotationY((360-90) * Math.PI / 180);
}
else return;

if (rotationMatrix !== undefined){
    cameraDirection.applyMatrix4(rotationMatrix);
}
var rayCaster = new THREE.Raycaster(controls.getObject().position, cameraDirection);    
var intersects = rayCaster.intersectObject(hitMesh, true);  

$("#status").html("camera direction x: " + cameraDirection.x + " , z: " + cameraDirection.z);

if ((intersects.length > 0 && intersects[0].distance < 25)) {
    lockDirection();
    $("#status").append("<br />Collision detected @ " + intersects[0].distance);

    var geometry = new THREE.Geometry();
    geometry.vertices.push(intersects[0].point);
    geometry.vertices.push(controls.getObject().position);
    scene.remove(rayLine);
    rayLine = new THREE.Line(geometry, new THREE.LineBasicMaterial({color: 0xFF00FF, linewidth: 2}));
    scene.add(rayLine);
}
}

我还对PointerLockControls.js进行了一些更改，以便在相机碰到对撞机对象时停止移动。我在此处上传了我的示例：CameraRayCasting.zip

<强>更新
最后我找到了一些时间来完成我的TouchControls项目。它使用threejs v0.77.1并支持触摸和命中测试在这里查看：TouchControls

Three.js，PointerLock和碰撞检测

1 个答案: