// ctrl_camera_pr_env.js
// ============================================================================
// FREE CAMERA + COLLISION ROBUSTE (type FPS léger) pour PlayCanvas (sans Ammo)
// - Souris : rotation (look around)
// - ZQSD / Flèches : déplacement local (avant/arrière & strafe)
// - Molette / Pinch : dolly (avance/recul le long du regard)
// - Collisions : sphère (caméra) vs AABBs "épaissies & fusionnées" du GLB (focusEntity)
// - Déplacements "swept" (sous-division en pas) pour éviter le tunneling
// - minY + BBox globale optionnelle (Xmin..Zmax) restent actives
// - Conserve les noms publics "orbitCamera*" pour compatibilité avec l'existant
// ============================================================================

var FreeCamera = pc.createScript('orbitCamera'); // garder le nom public "orbitCamera"

// ======================== Attributs ===========================
FreeCamera.attributes.add('inertiaFactor', { type: 'number', default: 0.12, title: 'Inertia (rotation)' });

// Limites de pitch
FreeCamera.attributes.add('pitchAngleMin', { type: 'number', default: -89, title: 'Pitch Min (deg)' });
FreeCamera.attributes.add('pitchAngleMax', { type: 'number', default:  89, title: 'Pitch Max (deg)' });

// minY (altitude min du point CAMÉRA)
FreeCamera.attributes.add('minY', { type: 'number', default: 0, title: 'Minimum camera Y' });

// Vitesse de déplacement (m/s)
FreeCamera.attributes.add('moveSpeed',   { type: 'number', default: 2.2, title: 'Move Speed' });
FreeCamera.attributes.add('strafeSpeed', { type: 'number', default: 2.2, title: 'Strafe Speed' });
FreeCamera.attributes.add('dollySpeed',  { type: 'number', default: 2.0, title: 'Mouse/Pinch Dolly Speed' });

// Collision (caméra sphère)
FreeCamera.attributes.add('collisionRadius',  { type: 'number', default: 0.30, title: 'Camera Sphere Radius' });
FreeCamera.attributes.add('collisionEpsilon', { type: 'number', default: 0.001, title: 'Collision Epsilon' });

// Sous-division du déplacement (swept)
FreeCamera.attributes.add('maxStepDistance', { type: 'number', default: 0.20, title: 'Max step distance (swept move)' });
FreeCamera.attributes.add('maxResolveIters', { type: 'number', default: 6, title: 'Max resolve iterations per step' });

// Construction des colliders
FreeCamera.attributes.add('mergeGap',   { type: 'number', default: 0.03, title: 'Merge AABBs gap tolerance (m)' });
FreeCamera.attributes.add('inflateBias',{ type: 'number', default: 0.02, title: 'Extra inflate beyond radius (m)' });

// Bounding Box globale (active si Xmin<Xmax etc.)
FreeCamera.attributes.add('Xmin', { type: 'number', default: -Infinity, title: 'BBox Xmin' });
FreeCamera.attributes.add('Xmax', { type: 'number', default:  Infinity, title: 'BBox Xmax' });
FreeCamera.attributes.add('Ymin', { type: 'number', default: -Infinity, title: 'BBox Ymin' });
FreeCamera.attributes.add('Ymax', { type: 'number', default:  Infinity, title: 'BBox Ymax' });
FreeCamera.attributes.add('Zmin', { type: 'number', default: -Infinity, title: 'BBox Zmin' });
FreeCamera.attributes.add('Zmax', { type: 'number', default:  Infinity, title: 'BBox Zmax' });

// Compat (certaines non utilisées, gardées pour le viewer)
FreeCamera.attributes.add('focusEntity',  { type: 'entity', title: 'Collision Root (ENV GLB)' });
FreeCamera.attributes.add('frameOnStart', { type: 'boolean', default: false, title: 'Compat: Frame on Start (unused)' });
FreeCamera.attributes.add('yawAngleMin',  { type: 'number', default: -360, title: 'Compat: Yaw Min (unused)' });
FreeCamera.attributes.add('yawAngleMax',  { type: 'number', default:  360, title: 'Compat: Yaw Max (unused)' });
FreeCamera.attributes.add('distanceMin',  { type: 'number', default:  0.1,  title: 'Compat: Distance Min (unused)' });

// ======================== Initialisation ===========================
Object.defineProperty(FreeCamera.prototype, 'pitch', {
    get: function () { return this._targetPitch; },
    set: function (v) { this._targetPitch = pc.math.clamp(v, this.pitchAngleMin, this.pitchAngleMax); }
});
Object.defineProperty(FreeCamera.prototype, 'yaw', {
    get: function () { return this._targetYaw; },
    set: function (v) { this._targetYaw = v; } // yaw libre (pas de clamp)
});

FreeCamera.prototype.initialize = function () {
    // angles init depuis l'orientation actuelle
    var q = this.entity.getRotation();
    var f = new pc.Vec3();
    q.transformVector(pc.Vec3.FORWARD, f);

    this._yaw   = Math.atan2(f.x, f.z) * pc.math.RAD_TO_DEG;
    var yawQuat = new pc.Quat().setFromEulerAngles(0, -this._yaw, 0);
    var noYawQ  = new pc.Quat().mul2(yawQuat, q);
    var fNoYaw  = new pc.Vec3();
    noYawQ.transformVector(pc.Vec3.FORWARD, fNoYaw);
    this._pitch = Math.atan2(-fNoYaw.y, -fNoYaw.z) * pc.math.RAD_TO_DEG;
    this._pitch = pc.math.clamp(this._pitch, this.pitchAngleMin, this.pitchAngleMax);

    this._targetYaw   = this._yaw;
    this._targetPitch = this._pitch;

    // Appliquer orientation immédiatement
    this.entity.setLocalEulerAngles(this._pitch, this._yaw, 0);

    // Etat input partagé
    this.app.systems.script.app.freeCamState = this.app.systems.script.app.freeCamState || {};
    this.state = this.app.systems.script.app.freeCamState;

    // Construire colliders robustes depuis le GLB (focusEntity)
    this._buildRobustColliders();

    // S’assure que la position courante respecte collisions + minY + bbox
    var p = this.entity.getPosition().clone();
    p = this._moveSweptTo(p, p); // passe par le résolveur même si delta nul
    this._clampPosition(p);
    this.entity.setPosition(p);

    // Aspect ratio (comme avant)
    var self = this;
    this._onResize = function(){ self._checkAspectRatio(); };
    window.addEventListener('resize', this._onResize, false);
    this._checkAspectRatio();
};

FreeCamera.prototype.update = function (dt) {
    // Rotation inertielle
    var t = this.inertiaFactor === 0 ? 1 : Math.min(dt / this.inertiaFactor, 1);
    this._yaw   = pc.math.lerp(this._yaw,   this._targetYaw,   t);
    this._pitch = pc.math.lerp(this._pitch, this._targetPitch, t);
    this.entity.setLocalEulerAngles(this._pitch, this._yaw, 0);

    // Recadrage léger
    var pos = this.entity.getPosition().clone();
    pos = this._resolveCollisions(pos, this.maxResolveIters);
    this._clampPosition(pos);
    this.entity.setPosition(pos);
};

FreeCamera.prototype._checkAspectRatio = function () {
    var gd = this.app.graphicsDevice;
    if (!gd) return;
    this.entity.camera.horizontalFov = (gd.height > gd.width);
};

// ======================== Colliders robustes ===========================
FreeCamera.prototype._buildRobustColliders = function () {
    this._colliders = [];       // { aabb: BoundingBox }
    this._worldAabb = null;     // BoundingBox globale du décor (utile debug / clamp)

    if (!this.focusEntity) return;

    // 1) Récupère toutes les AABBs world des meshInstances du GLB
    var tmp = [];
    var stack = [this.focusEntity];
    while (stack.length) {
        var e = stack.pop();
        var rc = e.render;
        if (rc && rc.meshInstances && rc.meshInstances.length) {
            for (var i = 0; i < rc.meshInstances.length; i++) {
                var aabb = rc.meshInstances[i].aabb;
                // clone
                tmp.push(new pc.BoundingBox(aabb.center.clone(), aabb.halfExtents.clone()));
            }
        }
        var ch = e.children;
        if (ch && ch.length) for (var c = 0; c < ch.length; c++) stack.push(ch[c]);
    }

    if (tmp.length === 0) return;

    // 2) Gonfle chaque AABB du rayon de la caméra + biais
    var inflate = Math.max(0, this.collisionRadius) + Math.max(0, this.inflateBias);
    for (var k = 0; k < tmp.length; k++) {
        var bb = tmp[k];
        bb.halfExtents.add(new pc.Vec3(inflate, inflate, inflate));
    }

    // 3) Fusionne les AABBs qui se touchent/quasi-se touchent (mergeGap)
    var merged = this._mergeAabbs(tmp, this.mergeGap);

    // 4) Enregistre
    for (var m = 0; m < merged.length; m++) {
        this._colliders.push({ aabb: merged[m] });
        if (!this._worldAabb) {
            this._worldAabb = new pc.BoundingBox(merged[m].center.clone(), merged[m].halfExtents.clone());
        } else {
            this._worldAabb.add(merged[m]);
        }
    }
};

// Fusion simple O(n^2) jusqu’à stabilisation
FreeCamera.prototype._mergeAabbs = function (boxes, gap) {
    var out = boxes.slice();
    var changed = true;
    var g = Math.max(0, gap || 0);

    function overlapsOrTouches(a, b, tol) {
        var amin = a.getMin(), amax = a.getMax();
        var bmin = b.getMin(), bmax = b.getMax();
        return !(
            amax.x < bmin.x - tol || amin.x > bmax.x + tol ||
            amax.y < bmin.y - tol || amin.y > bmax.y + tol ||
            amax.z < bmin.z - tol || amin.z > bmax.z + tol
        );
    }

    while (changed) {
        changed = false;
        var next = [];
        var used = new Array(out.length).fill(false);

        for (var i = 0; i < out.length; i++) {
            if (used[i]) continue;
            var acc = out[i];
            var mergedAny = false;

            for (var j = i + 1; j < out.length; j++) {
                if (used[j]) continue;
                if (overlapsOrTouches(acc, out[j], g)) {
                    // fusion : créer une nouvelle AABB couvrant acc et out[j]
                    var accMin = acc.getMin(), accMax = acc.getMax();
                    var bMin = out[j].getMin(), bMax = out[j].getMax();

                    var nMin = new pc.Vec3(
                        Math.min(accMin.x, bMin.x),
                        Math.min(accMin.y, bMin.y),
                        Math.min(accMin.z, bMin.z)
                    );
                    var nMax = new pc.Vec3(
                        Math.max(accMax.x, bMax.x),
                        Math.max(accMax.y, bMax.y),
                        Math.max(accMax.z, bMax.z)
                    );

                    var nCenter = nMin.clone().add(nMax).mulScalar(0.5);
                    var nHalf = nMax.clone().sub(nCenter).abs();
                    acc = new pc.BoundingBox(nCenter, nHalf);

                    used[j] = true;
                    mergedAny = true;
                    changed = true;
                }
            }

            used[i] = true;
            next.push(acc);
        }

        out = next;
    }

    return out;
};

// ======================== Contraintes génériques ===========================
FreeCamera.prototype._bboxEnabled = function () {
    return (this.Xmin < this.Xmax) && (this.Ymin < this.Ymax) && (this.Zmin < this.Zmax);
};

FreeCamera.prototype._clampPosition = function (p) {
    // minY prioritaire
    if (p.y < this.minY) p.y = this.minY;
    if (!this._bboxEnabled()) return;

    p.x = pc.math.clamp(p.x, this.Xmin, this.Xmax);
    p.y = pc.math.clamp(p.y, Math.max(this.Ymin, this.minY), this.Ymax);
    p.z = pc.math.clamp(p.z, this.Zmin, this.Zmax);
};

// ======================== Mouvement swept + résolution =====================
// Déplace "de -> to" par petits pas pour éviter le tunneling.
FreeCamera.prototype._moveSweptTo = function (from, to) {
    var maxStep = Math.max(0.01, this.maxStepDistance || 0.2);
    var delta = to.clone().sub(from);
    var dist = delta.length();

    if (dist <= maxStep) {
        var p = from.clone().add(delta);
        p = this._resolveCollisions(p, this.maxResolveIters);
        return p;
    }

    var steps = Math.ceil(dist / maxStep);
    var stepVec = delta.divScalar(steps);
    var cur = from.clone();

    for (var i = 0; i < steps; i++) {
        cur.add(stepVec);
        cur = this._resolveCollisions(cur, this.maxResolveIters);
    }
    return cur;
};

// Résolution itérative sphère (caméra) vs AABBs "épaissies"
FreeCamera.prototype._resolveCollisions = function (pos, maxIters) {
    var p = pos.clone();
    var eps = Math.max(1e-7, this.collisionEpsilon);

    if (!this._colliders || this._colliders.length === 0) return p;

    var iters = Math.max(1, maxIters || 1);
    for (var iter = 0; iter < iters; iter++) {
        var moved = false;

        for (var i = 0; i < this._colliders.length; i++) {
            var aabb = this._colliders[i].aabb;

            // Point le plus proche de p sur l'AABB
            var min = aabb.getMin();
            var max = aabb.getMax();

            var cx = pc.math.clamp(p.x, min.x, max.x);
            var cy = pc.math.clamp(p.y, min.y, max.y);
            var cz = pc.math.clamp(p.z, min.z, max.z);

            var dx = p.x - cx, dy = p.y - cy, dz = p.z - cz;
            var distSq = dx*dx + dy*dy + dz*dz;

            // Comme les AABBs sont déjà "épaissies" du rayon, ici on traite une sphère ~ de rayon ~0
            // => il suffit de sortir du volume (point dans AABB élargie)
            if (distSq < eps*eps && // p quasi dedans et très proche
                (p.x > min.x - eps && p.x < max.x + eps &&
                 p.y > min.y - eps && p.y < max.y + eps &&
                 p.z > min.z - eps && p.z < max.z + eps)) {

                // Choisir l'axe de moindre déplacement pour sortir
                var ex = Math.min(Math.abs(p.x - min.x), Math.abs(max.x - p.x));
                var ey = Math.min(Math.abs(p.y - min.y), Math.abs(max.y - p.y));
                var ez = Math.min(Math.abs(p.z - min.z), Math.abs(max.z - p.z));

                if (ex <= ey && ex <= ez) {
                    // pousser sur X
                    if (Math.abs(p.x - min.x) < Math.abs(max.x - p.x)) p.x = min.x - eps; else p.x = max.x + eps;
                } else if (ey <= ex && ey <= ez) {
                    // pousser sur Y (gère bord/nez de marche)
                    if (Math.abs(p.y - min.y) < Math.abs(max.y - p.y)) p.y = Math.max(this.minY, min.y - eps); else p.y = max.y + eps;
                } else {
                    // pousser sur Z
                    if (Math.abs(p.z - min.z) < Math.abs(max.z - p.z)) p.z = min.z - eps; else p.z = max.z + eps;
                }
                moved = true;
                continue;
            }

            // Cas général : p dans l'AABB "épaissie" (ou très proche) -> projeter vers l'extérieur
            var inside =
                (p.x > min.x - eps && p.x < max.x + eps &&
                 p.y > min.y - eps && p.y < max.y + eps &&
                 p.z > min.z - eps && p.z < max.z + eps);

            if (inside) {
                var dxMin = Math.abs(p.x - min.x), dxMax = Math.abs(max.x - p.x);
                var dyMin = Math.abs(p.y - min.y), dyMax = Math.abs(max.y - p.y);
                var dzMin = Math.abs(p.z - min.z), dzMax = Math.abs(max.z - p.z);

                var ax = Math.min(dxMin, dxMax);
                var ay = Math.min(dyMin, dyMax);
                var az = Math.min(dzMin, dzMax);

                if (ax <= ay && ax <= az) {
                    // sortir par X
                    if (dxMin < dxMax) p.x = min.x - eps; else p.x = max.x + eps;
                } else if (ay <= ax && ay <= az) {
                    // sortir par Y
                    if (dyMin < dyMax) p.y = Math.max(this.minY, min.y - eps); else p.y = max.y + eps;
                } else {
                    // sortir par Z
                    if (dzMin < dzMax) p.z = min.z - eps; else p.z = max.z + eps;
                }
                moved = true;
            }
        }

        if (!moved) break;
    }

    return p;
};

// ===================== INPUT SOURIS (rotation + molette dolly) =====================
var FreeCameraInputMouse = pc.createScript('orbitCameraInputMouse'); // garder le nom
FreeCameraInputMouse.attributes.add('lookSensitivity', { type: 'number', default: 0.3, title: 'Look Sensitivity' });
FreeCameraInputMouse.attributes.add('wheelSensitivity',{ type: 'number', default: 1.0, title: 'Wheel Sensitivity' });

FreeCameraInputMouse.prototype.initialize = function () {
    this.freeCam = this.entity.script.orbitCamera; // instance FreeCamera
    this.last = new pc.Vec2();
    this.isLooking = false;

    if (this.app.mouse) {
        this.app.mouse.on(pc.EVENT_MOUSEDOWN,  this.onMouseDown,  this);
        this.app.mouse.on(pc.EVENT_MOUSEUP,    this.onMouseUp,    this);
        this.app.mouse.on(pc.EVENT_MOUSEMOVE,  this.onMouseMove,  this);
        this.app.mouse.on(pc.EVENT_MOUSEWHEEL, this.onMouseWheel, this);
        this.app.mouse.disableContextMenu();
    }
    var self = this;
    this._onOut = function(){ self.isLooking = false; };
    window.addEventListener('mouseout', this._onOut, false);

    this.on('destroy', () => {
        if (this.app.mouse) {
            this.app.mouse.off(pc.EVENT_MOUSEDOWN,  this.onMouseDown,  this);
            this.app.mouse.off(pc.EVENT_MOUSEUP,    this.onMouseUp,    this);
            this.app.mouse.off(pc.EVENT_MOUSEMOVE,  this.onMouseMove,  this);
            this.app.mouse.off(pc.EVENT_MOUSEWHEEL, this.onMouseWheel, this);
        }
        window.removeEventListener('mouseout', this._onOut, false);
    });
};

FreeCameraInputMouse.prototype.onMouseDown = function (e) {
    this.isLooking = true;
    this.last.set(e.x, e.y);
};

FreeCameraInputMouse.prototype.onMouseUp = function () { this.isLooking = false; };

FreeCameraInputMouse.prototype.onMouseMove = function (e) {
    if (!this.isLooking || !this.freeCam) return;
    var sens = this.lookSensitivity;
    this.freeCam.yaw   = this.freeCam.yaw   - e.dx * sens;
    this.freeCam.pitch = this.freeCam.pitch - e.dy * sens;
    this.last.set(e.x, e.y);
};

FreeCameraInputMouse.prototype.onMouseWheel = function (e) {
    if (!this.freeCam) return;

    var cam = this.entity;
    var move = -e.wheelDelta * this.wheelSensitivity * this.freeCam.dollySpeed * 0.05;
    var forward = cam.forward.clone(); if (forward.lengthSq() > 1e-8) forward.normalize();

    var from = cam.getPosition().clone();
    var to   = from.clone().add(forward.mulScalar(move));

    var next = this.freeCam._moveSweptTo(from, to);
    this.freeCam._clampPosition(next);
    cam.setPosition(next);

    e.event.preventDefault();
};

// ===================== INPUT TOUCH (look + pinch dolly) =====================
var FreeCameraInputTouch = pc.createScript('orbitCameraInputTouch');
FreeCameraInputTouch.attributes.add('lookSensitivity',   { type: 'number', default: 0.5, title: 'Look Sensitivity' });
FreeCameraInputTouch.attributes.add('pinchDollyFactor',  { type: 'number', default: 0.02, title: 'Pinch Dolly Factor' });

FreeCameraInputTouch.prototype.initialize = function () {
    this.freeCam = this.entity.script.orbitCamera;
    this.last = new pc.Vec2();
    this.isLooking = false;
    this.lastPinch = 0;

    if (this.app.touch) {
        this.app.touch.on(pc.EVENT_TOUCHSTART,  this.onTouchStartEndCancel, this);
        this.app.touch.on(pc.EVENT_TOUCHEND,    this.onTouchStartEndCancel, this);
        this.app.touch.on(pc.EVENT_TOUCHCANCEL, this.onTouchStartEndCancel, this);
        this.app.touch.on(pc.EVENT_TOUCHMOVE,   this.onTouchMove, this);
    }

    this.on('destroy', () => {
        if (this.app.touch) {
            this.app.touch.off(pc.EVENT_TOUCHSTART,  this.onTouchStartEndCancel, this);
            this.app.touch.off(pc.EVENT_TOUCHEND,    this.onTouchStartEndCancel, this);
            this.app.touch.off(pc.EVENT_TOUCHCANCEL, this.onTouchStartEndCancel, this);
            this.app.touch.off(pc.EVENT_TOUCHMOVE,   this.onTouchMove, this);
        }
    });
};

FreeCameraInputTouch.prototype.onTouchStartEndCancel = function (e) {
    var t = e.touches;
    if (t.length === 1) {
        this.isLooking = (e.event.type === 'touchstart');
        this.last.set(t[0].x, t[0].y);
    } else if (t.length === 2) {
        var dx = t[0].x - t[1].x;
        var dy = t[0].y - t[1].y;
        this.lastPinch = Math.sqrt(dx*dx + dy*dy);
    } else {
        this.isLooking = false;
    }
};

FreeCameraInputTouch.prototype.onTouchMove = function (e) {
    var t = e.touches;
    if (!this.freeCam) return;

    if (t.length === 1 && this.isLooking) {
        var sens = this.lookSensitivity;
        var dx = t[0].x - this.last.x;
        var dy = t[0].y - this.last.y;

        this.freeCam.yaw   = this.freeCam.yaw   - dx * sens;
        this.freeCam.pitch = this.freeCam.pitch - dy * sens;

        this.last.set(t[0].x, t[0].y);
    } else if (t.length === 2) {
        // Pinch dolly
        var dx = t[0].x - t[1].x;
        var dy = t[0].y - t[1].y;
        var dist = Math.sqrt(dx*dx + dy*dy);
        var delta = dist - this.lastPinch;
        this.lastPinch = dist;

        var cam = this.entity;
        var forward = cam.forward.clone(); if (forward.lengthSq() > 1e-8) forward.normalize();
        var from = cam.getPosition().clone();
        var to   = from.clone().add(forward.mulScalar(delta * this.pinchDollyFactor * this.freeCam.dollySpeed));

        var next = this.freeCam._moveSweptTo(from, to);
        this.freeCam._clampPosition(next);
        cam.setPosition(next);
    }
};

// ===================== INPUT CLAVIER (ZQSD + flèches) =====================
var FreeCameraInputKeyboard = pc.createScript('orbitCameraInputKeyboard');

FreeCameraInputKeyboard.attributes.add('acceleration', { type: 'number', default: 1.0, title: 'Accel (unused, future)' });

FreeCameraInputKeyboard.prototype.initialize = function () {
    this.freeCam = this.entity.script.orbitCamera;
    this.kb = this.app.keyboard || null;
};

FreeCameraInputKeyboard.prototype.update = function (dt) {
    if (!this.freeCam || !this.kb) return;

    // Déplacements : flèches OU ZQSD (AZERTY)
    var fwd  = (this.kb.isPressed(pc.KEY_UP)    || this.kb.isPressed(pc.KEY_Z)) ?  1 :
               (this.kb.isPressed(pc.KEY_DOWN)  || this.kb.isPressed(pc.KEY_S)) ? -1 : 0;

    var strf = (this.kb.isPressed(pc.KEY_RIGHT) || this.kb.isPressed(pc.KEY_D)) ?  1 :
               (this.kb.isPressed(pc.KEY_LEFT)  || this.kb.isPressed(pc.KEY_Q)) ? -1 : 0;

    if (fwd !== 0 || strf !== 0) {
        var cam = this.entity;
        var from = cam.getPosition().clone();

        var forward = cam.forward.clone();  if (forward.lengthSq()  > 1e-8) forward.normalize();
        var right   = cam.right.clone();    if (right.lengthSq()    > 1e-8) right.normalize();

        var delta = new pc.Vec3();
        delta.add(forward.mulScalar(fwd  * this.freeCam.moveSpeed   * dt));
        delta.add(right  .mulScalar(strf * this.freeCam.strafeSpeed * dt));

        var to = from.clone().add(delta);
        var next = this.freeCam._moveSweptTo(from, to);
        this.freeCam._clampPosition(next);
        cam.setPosition(next);
    }

    // Rotation au clavier (Shift + flèches)
    var shift = this.kb.isPressed(pc.KEY_SHIFT);
    if (shift) {
        var yawDir   = (this.kb.isPressed(pc.KEY_LEFT) ? 1 : 0) - (this.kb.isPressed(pc.KEY_RIGHT) ? 1 : 0); // ← CCW / → CW
        var pitchDir = (this.kb.isPressed(pc.KEY_UP)   ? 1 : 0) - (this.kb.isPressed(pc.KEY_DOWN)  ? 1 : 0); // ↑ up / ↓ down

        var yawSpeed   = 120; // deg/s
        var pitchSpeed =  90; // deg/s
        if (yawDir   !== 0) this.freeCam.yaw   = this.freeCam.yaw   + yawDir   * yawSpeed   * dt;
        if (pitchDir !== 0) this.freeCam.pitch = this.freeCam.pitch + pitchDir * pitchSpeed * dt;
    }
};