将带孔的SVG路径转换为three.js中的挤出形状

Question

我有一个由4个多边形组成的形状：2个非孔和2个孔。这只是一个例子。实际上，可以存在由50个多边形组成的形状，其中20个是非孔，30个是孔。在SVG路径中，这个类似的多边形可以通过组合moveto：s和lineto：s轻松表示。路径串中的每个子多边形（孔或非孔）以moveto-command开头，以z（end）命令结束，非孔具有绕组顺序CW和孔CCW。非常简单直观。

SVG中的形状以这种方式表示（http://jsbin.com/osoxev/1/edit）：

<path d="M305.08,241.97 L306,251.51 L308.18,256.39 L311.72,259.09 L317.31,260.01 L324.71,259.01 L332.45,255.86 L335.57,257.53 L337.6,260.44 L336.94,262.33 L328.27,268.74 L317.89,273.41 L307.94,275.49 L296.26,275.23 L286.64,272.99 L279.78,269.31 L274.14,263.55 L271.65,260.21 L269.2,261.06 L254.83,268.51 L242.11,272.97 L227.59,275.23 L209.91,275.48 L197.47,273.63 L187.91,270.13 L180.48,265.09 L175.32,258.88 L172.2,251.44 L171.1,242.23 L172.24,233.63 L175.49,226.24 L181,219.54 L189.42,213.3 L201.36,207.73 L217.23,203.25 L238.28,200.1 L265.24,198.78 L269.37,198.47 L269.98,182.93 L268.74,171.32 L266.05,163.7 L261.58,157.72 L255.24,153.24 L247.06,150.32 L235.44,149.13 L224.71,150.05 L215.91,153 L210.23,156.86 L207.64,160.85 L207.19,165.28 L209.34,169.86 L212.01,174.15 L212.14,177.99 L209.8,181.78 L204.22,185.79 L197.62,187.68 L188.65,187.43 L182.41,185.39 L178.45,181.77 L176.2,176.9 L176.03,170.64 L178.2,164.13 L183.09,157.69 L191.04,151.36 L202.01,145.82 L216.09,141.57 L232.08,139.24 L250.07,139.18 L266.13,141.23 L279.05,145.06 L289.15,150.3 L295.91,156.19 L300.73,163.41 L303.85,172.47 L305.07,183.78 L305.07,241.97 L305.08,241.97Z 

M243.99,64.95 L255.92,66.06 L266.21,69.28 L274.98,74.44 L280.64,80.19 L284.02,86.85 L285.26,94.52 L284.27,102.84 L281.24,109.66 L276.03,115.43 L267.89,120.46 L257.68,123.93 L245.79,125.33 L232.93,124.53 L222.21,121.74 L213.14,117.11 L207.36,111.92 L203.7,105.75 L201.94,98.18 L202.34,90.12 L204.86,83.4 L210.01,76.81 L217.49,71.33 L227.17,67.31 L238.35,65.2 L243.75,64.95 L243.99,64.95Z

M269.99,212.88 L269.48,208.76 L266.59,208.36 L245.76,210.86 L230.95,214.67 L220.9,219.34 L213.82,224.85 L209.69,230.71 L207.92,237.03 L208.4,244.49 L210.86,250.57 L215.2,255.08 L221.69,258.13 L230.57,259.43 L242.52,258.58 L255.27,255.23 L266.07,250.04 L269.34,247.02 L269.99,244.81 L269.99,212.88 L269.99,212.88Z

M243.63,73.34 L235.93,74.4 L230.07,77.36 L225.65,82.21 L223.05,88.57 L222.41,96.92 L223.94,104.53 L227.23,110.22 L231.99,114.29 L238.44,116.65 L246.81,116.94 L253.73,115.1 L258.87,111.5 L262.63,106.12 L264.64,98.93 L264.59,90.25 L262.47,83.41 L258.65,78.43 L253.37,75.08 L246.08,73.43 L243.68,73.34 L243.63,73.34Z"/>

当我尝试在three.js中遵循相同的逻辑时，我遇到了问题。以下是此图片：

three.js似乎不明白什么是移动意味着什么。它应该“上笔”，并且在前一个点和moveto命令点之间什么都不画。但是“笔不会上升”并且形状会断裂。

代码部分是这样的（不要混淆变量名，它们来自其他例子）：

// Create glyph shape (sorry the confusing name):
var starPoints2 = new THREE.Shape();

// Add first polygon
starPoints2.moveTo(307.94,275.49);
starPoints2.lineTo(296.26,275.23);
// .....
starPoints2.lineTo(286.64,272.99);
starPoints2.lineTo(307.94,275.49);

// Add second polygon
starPoints2.moveTo(245.79,125.33);
starPoints2.lineTo(232.93,124.53);
// .....
starPoints2.lineTo(257.68,123.93);
starPoints2.lineTo(245.79,125.33);

// Create path for holes
var smileyEye1Path = new THREE.Path();

// First hole
smileyEye1Path.moveTo(221.69,258.13);
smileyEye1Path.lineTo(215.2,255.08);
// .....
smileyEye1Path.lineTo(230.57,259.43);
smileyEye1Path.lineTo(221.69,258.13);

// Second hole
smileyEye1Path.moveTo(238.44,116.65);
smileyEye1Path.lineTo(231.99,114.29);
// .....
smileyEye1Path.lineTo(246.81,116.94);
smileyEye1Path.lineTo(238.44,116.65);

// Add holes to shape
var starShape = starPoints2;
starShape.holes.push( smileyEye1Path );

// Extrude after that. See the full code here:
// http://jsfiddle.net/pHn2B/33/

function(){} http://jsfiddle.net/pHn2B/33/

我的代码中出错了什么或者是否存在three.js中的错误？

Answer 1

在形状定义中间不能有moveTo。你必须有两个单独的形状。你可以这样做：

var object = new THREE.Object3D();

var shape1 = new THREE.Shape();
var shape2 = new THREE.Shape();

var hole1 = new THREE.Path();
var hole2 = new THREE.Path();

shape1.holes.push( hole1 );
shape2.holes.push( hole2 );

. . .

object.add( mesh1 );
object.add( mesh2 );

scene.add( object );

小提琴：http://jsfiddle.net/pHn2B/34/

three.js r.58

P.S。友情提示：将来，最好让人们帮助您 - 编辑变量名称并从示例中删除不相关的代码。