将带有孔的SVG路径转换为three.js中的挤压形状

Question

我有一个由4个多边形组成的形状：2个无孔和2个孔。这只是一个例子。实际上，可以有一个由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，通过将moveto：s和lineto：s组合可以很容易地表示这个多边形。路径字符串中的每个子多边形（孔或非孔）以moveto命令开始，以z（end）命令结束，无孔的顺序为CW和孔为CCW。非常简单直观。

在SVG形状被表示这种方式（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"/> 

当尝试遵循three.js所相同的逻辑，我遇到问题。下面是一个这样的形象：

的three.js所似乎并不明白MOVETO手段。它应该让“笔”在先前的点和移动到命令之间画什么。但“笔不上去”，形状中断。

的代码部分是这样的（不要混淆变量名，他们是来自其他的例子）：

 
// 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/

我在做什么错在我的代码或three.js有bug吗？

Answer 1

在形状定义的中间不能有moveTo。你必须有两个独立的形状。你可以做这样的事情：

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所r.58

附：友情提示：将来，让人们轻松地帮助你 - 编辑你的变量名并从你的例子中删除不相关的代码是一个好主意。