如何居中和缩放对象threejs

时间:2015-08-17 19:46:16

标签: javascript html 3d three.js

我正在使用以下代码来缩放和居中使用ObjectLoader加载的msgpack压缩对象,但它无法正常工作。我认为我的对象有一个旋转,因此导致奇怪的行为。在某些对象上,它成功地居中,但在其他对象上,居中是偏移的,缩放也不正确。

在此片段中,结果是ObjectLoader中的场景。我的想法是对象形成的不是很好,但我不确定。我希望图像上的表格或任何其他用户输入的网格物体位于网格的顶部,居中并缩放,以使最大尺寸为1个单位。

每个方块的尺寸为0.25,轴为0,0,0 http://i.stack.imgur.com/fkKYC.png

    // result is a threejs scene        
    var geometry = result.children[0].geometry;
    var mesh = result.children[0];
    geometry.computeBoundingBox();
    var middle = new THREE.Vector3();
    middle.x        = ( geometry.boundingBox.max.x + geometry.boundingBox.min.x ) / 2;
    middle.y        = -geometry.boundingBox.min.y;
    middle.z        = ( geometry.boundingBox.max.z + geometry.boundingBox.min.z ) / 2;
    middle.negate();
    mesh.position.copy(middle);
    // scales the mesh up to maxsize
    var maxSize = 1;
    // gets the biggest axis
    var maxVal = geometry.boundingBox.max.x - geometry.boundingBox.min.x;
    if (maxVal < geometry.boundingBox.max.y - geometry.boundingBox.min.y) {
        maxVal = geometry.boundingBox.max.y - geometry.boundingBox.min.y;
    }
    if (maxVal < geometry.boundingBox.max.z - geometry.boundingBox.min.z) {
        maxVal = geometry.boundingBox.max.z - geometry.boundingBox.min.z;
    // scales the current size proportional to the maxval, times maxsize
    mesh.scale.divideScalar(maxVal * maxSize);

    self.scene.add(result);

1 个答案:

答案 0 :(得分:5)

不是拨打geometry.computeBoundingBox();来电geometry.center();,而是您不需要middle.xmiddle.z,而只需拨打mesh.translateY()而不是摆弄middle完全{1}}