Question

TrackballControl的目的是在轨迹球外面有一个“边界”，导致滚动吗？我个人不喜欢它。它有点不连续，并没有太多的目的（imho）。

如果没有，可以改变函数getMouseProjectionOnBall，类似于以下内容。这样做有两件事（不一定“正确”）：

将半径标准化以填充两个轴
将z值映射到球外（即z之前为0）

我个人认为这更自然。

思想？

 this.getMouseProjectionOnBall = function(clientX, clientY)  {
    var xnormalized = (clientX - _this.screen.width * 0.5 - _this.screen.offsetLeft) / (_this.screen.width / 2.0);
    var ynormalized = (_this.screen.height * 0.5 + _this.screen.offsetTop - clientY) / (_this.screen.height / 2.0);
    var mouseOnBall = new THREE.Vector3(
        xnormalized,
        ynormalized,
        0.0
    );

    var length = mouseOnBall.length();

    var ballRadius = 1.0;  // As a fraction of the screen 
    if (length > ballRadius * 0.70710678118654752440) {
        var temp = ballRadius / 1.41421356237309504880;
        mouseOnBall.z = temp * temp / length;

        // Remove old method.
        // This Left z = 0, which meant rotation axis
        // becomes z, which is a roll
        //mouseOnBall.normalize();

    } else {
        mouseOnBall.z = Math.sqrt(1.0 - length * length);
    }

    _eye.copy(_this.object.position).sub(_this.target);

    var projection = _this.object.up.clone().setLength(mouseOnBall.y);
    projection.add(_this.object.up.clone().cross(_eye).setLength(mouseOnBall.x));
    projection.add(_eye.setLength(mouseOnBall.z));

    return projection;

};

在轨迹球控件中消除无球滚动（带代码/修复）

0 个答案: