org.simantics.g3d/src/org/simantics/g3d/shape/Cone.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2012, 2013 Association for Decentralized Information Management in\r
   3  * Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.g3d.shape;\r
  13 \r
  14 import java.util.ArrayList;\r
  15 import java.util.List;\r
  16 \r
  17 import javax.vecmath.AxisAngle4d;\r
  18 import javax.vecmath.Vector3d;\r
  19 \r
  20 import org.simantics.g3d.math.MathTools;\r
  21 \r
  22 public class Cone {\r
  23 \r
  24         public static Mesh create(double radius, int s) {\r
  25                 if (s < 3 || radius < MathTools.NEAR_ZERO)\r
  26                         throw new IllegalArgumentException();\r
  27                 List<Vector3d> vertices = new ArrayList<Vector3d>(s+2);\r
  28                 List<Vector3d> normals = new ArrayList<Vector3d>(vertices.size());\r
  29                 List<Integer> indices = new ArrayList<Integer>();\r
  30                 \r
  31                 vertices.add(new Vector3d(0.0,0.0,0.0));\r
  32                 normals.add(new Vector3d(0.0,-1.0,0.0));\r
  33                 vertices.add(new Vector3d(0.0,radius*2.0,0.0));\r
  34                 normals.add(new Vector3d(0.0,1.0,0.0));\r
  35                 \r
  36                 Vector3d v = new Vector3d(radius,0,0);\r
  37                 for (int i = 0; i < s; i++) {\r
  38                         AxisAngle4d aa = new AxisAngle4d(0,1,0,((double)i/(double)s)*Math.PI * 2);\r
  39                         Vector3d t = new Vector3d();\r
  40                         MathTools.rotate(MathTools.getQuat(aa), v, t);\r
  41                         vertices.add(t);\r
  42                         Vector3d n = new Vector3d(t);\r
  43                         n.normalize();\r
  44                         normals.add(n);\r
  45                 }\r
  46                 \r
  47                 for (int i = 0; i < s; i++) {\r
  48                         indices.add(0);\r
  49                         \r
  50                         if (i < s - 1)\r
  51                                 indices.add(i + 3);\r
  52                         else\r
  53                                 indices.add(2);\r
  54                         indices.add(i + 2);\r
  55                 }\r
  56                 \r
  57                 for (int i = 0; i < s; i++) {\r
  58                         indices.add(1);\r
  59                         indices.add(i + 2);\r
  60                         if (i < s - 1)\r
  61                                 indices.add(i + 3);\r
  62                         else\r
  63                                 indices.add(2);\r
  64                         \r
  65                 }\r
  66                 return new Mesh(vertices,normals,indices);\r
  67                 \r
  68         }\r
  69         \r
  70         public static void main(String arg[]) {\r
  71                 Mesh s1 = create(1.0, 3);\r
  72                 Mesh s2 = create(1.0, 4);\r
  73                 System.out.println("debug " + s1 + "\n" + s2);\r
  74         }\r
  75 }\r