3D framework (Simca 2012)

[simantics/3d.git] / org.simantics.g3d / src / org / simantics / g3d / shape / Cone.java

diff --git a/org.simantics.g3d/src/org/simantics/g3d/shape/Cone.java b/org.simantics.g3d/src/org/simantics/g3d/shape/Cone.java
new file mode 100644 (file)
index 0000000..19f9200
--- /dev/null
+++ b/org.simantics.g3d/src/org/simantics/g3d/shape/Cone.java
@@ -0,0 +1,64 @@
+package org.simantics.g3d.shape;\r
+\r
+import java.util.ArrayList;\r
+import java.util.List;\r
+\r
+import javax.vecmath.AxisAngle4d;\r
+import javax.vecmath.Vector3d;\r
+\r
+import org.simantics.g3d.math.MathTools;\r
+\r
+public class Cone {\r
+\r
+       public static Mesh create(double radius, int s) {\r
+               if (s < 3 || radius < MathTools.NEAR_ZERO)\r
+                       throw new IllegalArgumentException();\r
+               List<Vector3d> vertices = new ArrayList<Vector3d>(s+2);\r
+               List<Vector3d> normals = new ArrayList<Vector3d>(vertices.size());\r
+               List<Integer> indices = new ArrayList<Integer>();\r
+               \r
+               vertices.add(new Vector3d(0.0,0.0,0.0));\r
+               normals.add(new Vector3d(0.0,-1.0,0.0));\r
+               vertices.add(new Vector3d(0.0,radius*2.0,0.0));\r
+               normals.add(new Vector3d(0.0,1.0,0.0));\r
+               \r
+               Vector3d v = new Vector3d(radius,0,0);\r
+               for (int i = 0; i < s; i++) {\r
+                       AxisAngle4d aa = new AxisAngle4d(0,1,0,((double)i/(double)s)*Math.PI * 2);\r
+                       Vector3d t = new Vector3d();\r
+                       MathTools.rotate(MathTools.getQuat(aa), v, t);\r
+                       vertices.add(t);\r
+                       Vector3d n = new Vector3d(t);\r
+                       n.normalize();\r
+                       normals.add(n);\r
+               }\r
+               \r
+               for (int i = 0; i < s; i++) {\r
+                       indices.add(0);\r
+                       \r
+                       if (i < s - 1)\r
+                               indices.add(i + 3);\r
+                       else\r
+                               indices.add(2);\r
+                       indices.add(i + 2);\r
+               }\r
+               \r
+               for (int i = 0; i < s; i++) {\r
+                       indices.add(1);\r
+                       indices.add(i + 2);\r
+                       if (i < s - 1)\r
+                               indices.add(i + 3);\r
+                       else\r
+                               indices.add(2);\r
+                       \r
+               }\r
+               return new Mesh(vertices,normals,indices);\r
+               \r
+       }\r
+       \r
+       public static void main(String arg[]) {\r
+               Mesh s1 = create(1.0, 3);\r
+               Mesh s2 = create(1.0, 4);\r
+               System.out.println("debug " + s1 + "\n" + s2);\r
+       }\r
+}\r