在Three.js中将带孔的SVG路径转换为拉伸形状 [英] Converting SVG paths with holes to extruded shapes in three.js
问题描述
我的形状由4个多边形组成:2个非孔和2个孔.这只是一个例子.实际上，可能存在由50个多边形组成的形状，其中20个是非孔，而30个是孔.在SVG路径中，可以通过组合moveto:s和lineto:s来轻松表示类似多边形的图形.路径字符串中的每个子多边形(孔或非孔)都以moveto命令开头，并以z(end)命令结尾，非孔的缠绕顺序为CW，孔的缠绕方向为CCW.非常简单直观.
I have a shape that consists of 4 polygons: 2 non-holes and 2 holes. This is only an example. In reality there can be a shape that consists of 50 polygons, of which 20 are non-holes and 30 are holes. In SVG path this like polygon can be represented easily by combining moveto:s and lineto:s. Every sub-polygon (hole or non-hole) in path string starts with moveto-command and ends with z (end) command and non-holes have winding order CW and holes CCW. Very easy and intuitive.
以这种方式表示SVG中的形状( http://jsbin.com/osoxev/1/编辑):
The shape in SVG is represented this way (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"/>
当我尝试遵循Three.js中的相同逻辑时，我遇到了问题.以下是此图片:
When I try to follow the same logic in three.js, I run into problems. Below is an image of this:
Three.js似乎不了解moveto的含义.它应进行笔划"，并且在上一点与moveto命令的一点之间不画任何东西.但是笔不上升"并且形状破裂.
The three.js doesn't seem to understand what moveto means. It should make "pen up" and draw nothing between previous point and point of moveto command. But the "pen doesnt go up" and the shape breaks.
代码部分是这样的(不要混淆变量名，它们来自其他示例):
The code portion is this (don't confuse of variable names, they are from other example):
// 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/
我在代码中做错了什么，还是three.js中有错误?
What I'm doing wrong in my code or is there bug in three.js?
推荐答案
形状定义中间不能有moveTo.您必须具有两个单独的形状.您可以执行以下操作:
You can't have a moveTo in the middle of a shape definition. You have to have two separate shapes. You can do something like this:
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
three.js r.58
P.S.友善的提示:将来，最好是让人们轻松地为您提供帮助-编辑变量名并从示例中删除不相关的代码.
P.S. Friendly tip: In the future, it would be a good idea to make it easy for people to help you -- edit your variable names and remove unrelated code from your example.
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