Engine directory for ticket #1

Engine/source/math/util/sphereMesh.h

@@ -0,0 +1,88 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#ifndef _SPHEREMESH_H_
+#define _SPHEREMESH_H_
+
+#ifndef _MMATH_H_
+#include "math/mMath.h"
+#endif
+#ifndef _TVECTOR_H_
+#include "core/util/tVector.h"
+#endif
+
+//------------------------------------------------------------------------------
+// Class: SphereMesh
+//------------------------------------------------------------------------------
+// * ctor takes type of base polyhedron that is subdivided to create sphere
+// * getMesh(...) will subdivide the current mesh to the desired level where
+//   (each level has 4 times the polys of the previous level)
+
+class SphereMesh
+{
+   public:
+
+      // regular polyhedra with triangle face polygons (num of faces)
+      enum {
+         Tetrahedron = 4,
+         Octahedron = 8,
+         Icosahedron = 20,
+
+         MaxLevel       = 5
+      };
+
+      struct Triangle {
+         Triangle() {}
+         Triangle(const Point3F &a, const Point3F &b, const Point3F &c)
+         {
+            pnt[0] = a;
+            pnt[1] = b;
+            pnt[2] = c;
+         }
+
+         Point3F     pnt[3];
+         Point3F     normal;
+      };
+
+      struct TriangleMesh {
+         U32            numPoly;
+         Triangle *     poly;
+      };
+
+      SphereMesh(U32 baseType = Octahedron);
+      ~SphereMesh();
+
+      const TriangleMesh * getMesh(U32 level = 0);
+
+   private:
+
+      TriangleMesh * createTetrahedron();
+      TriangleMesh * createOctahedron();
+      TriangleMesh * createIcosahedron();
+
+      Vector<TriangleMesh*>      mDetails;
+
+      void calcNormals(TriangleMesh *);
+      TriangleMesh * subdivideMesh(TriangleMesh*);
+};
+
+#endif