Question

我有在3d空间中旋转的绘图（带有x和y坐标的点阵列）： http://www.motiondraw.com/md/as_samples/Testing/_mindreader/main.html

就像现在一样，这幅画看起来好像缠绕在一个立方体上，角落里有一个令人讨厌的90度。相反，它应该看起来好像是围绕着一个圆柱体。在开始旋转之前，我调用一个函数（在ActionScript中）'bendDrawing'，为每个点设置一个初始z值：

for（var j = 0; j＆lt; numPoints; j ++）{
//图纸居中 - 中心左边的点是＆lt; 0 var distFromCenter = Math.abs（shape [i] .points [j] .x）;

var wid = 350;// this could be the radius of the cylinder

// NOTE: suboptimal, as the image gets a 90° corner in the center, at its highest point
// what it should look like: as if the image was wrapped around a cylinder, i.e. in a circular shape
// is that pythagoras? draw triangle, calc distance from base, add to this to c?
var z = wid - distFromCenter;

shape[i].points[j].z =  Math.abs( z);

}

我无法绕过这个;-) 任何指针都非常赞赏！

安德烈亚斯韦伯

Answer 1

试试这个：

shape[i].points[j].z  = 
    wid * Math.cos((shape[i].points[j].x / wid) * (0.5 * Math.PI));

2d到3d - 如何围绕圆柱包装图纸

1 个答案: