1 /* 2 ----------------------------------------------------------------------------- 3 This source file is part of OGRE 4 (Object-oriented Graphics Rendering Engine) 5 For the latest info, see http://www.ogre3d.org/ 6 7 Copyright (c) 2000-2014 Torus Knot Software Ltd 8 9 Permission is hereby granted, free of charge, to any person obtaining a copy 10 of this software and associated documentation files (the "Software"), to deal 11 in the Software without restriction, including without limitation the rights 12 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 13 copies of the Software, and to permit persons to whom the Software is 14 furnished to do so, subject to the following conditions: 15 16 The above copyright notice and this permission notice shall be included in 17 all copies or substantial portions of the Software. 18 19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 22 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 23 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 24 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 25 THE SOFTWARE. 26 ----------------------------------------------------------------------------- 27 */ 28 #ifndef __Ogre_Volume_IsoSurfaceMC_H__ 29 #define __Ogre_Volume_IsoSurfaceMC_H__ 30 31 #include "OgreVolumeIsoSurface.h" 32 #include "OgreVector3.h" 33 #include "OgreVector4.h" 34 #include <float.h> 35 36 namespace Ogre { 37 namespace Volume { 38 /** \addtogroup Optional 39 * @{ 40 */ 41 /** \addtogroup Volume 42 * @{ 43 */ 44 class Source; 45 class MeshBuilder; 46 47 /** Marching Cubes implementation like at 48 http://local.wasp.uwa.edu.au/~pbourke/geometry/polygonise/ 49 */ 50 class _OgreVolumeExport IsoSurfaceMC : public IsoSurface 51 { 52 protected: 53 54 55 /** Linear interpolation between two vectors based on some values associated to them. 56 @param v0 57 The first vector. 58 @param v1 59 The second vector. 60 @param val0 61 The value for the first vector. 62 @param val1 63 The value for the second vector. 64 @param normal 65 Reference to a vector where the normal will be stored. 66 @return 67 The interpolated position. 68 */ interpolate(const Vector3 & v0,const Vector3 & v1,const Vector4 & val0,const Vector4 & val1,Vector3 & normal)69 inline Vector3 interpolate(const Vector3 &v0, const Vector3 &v1, const Vector4 &val0, const Vector4 &val1, Vector3 &normal) const 70 { 71 // Don't use Math::RealEqual here as it isn't inlined and this function is performance critical. 72 if (fabs(val0.w - ISO_LEVEL) <= FLT_EPSILON) 73 { 74 normal.x = val0.x; 75 normal.y = val0.y; 76 normal.z = val0.z; 77 return v0; 78 } 79 if (fabs(val1.w - ISO_LEVEL) <= FLT_EPSILON) 80 { 81 normal.x = val1.x; 82 normal.y = val1.y; 83 normal.z = val1.z; 84 return v1; 85 } 86 if (fabs(val1.w - val0.w) <= FLT_EPSILON) 87 { 88 normal.x = val0.x; 89 normal.y = val0.y; 90 normal.z = val0.z; 91 return v0; 92 } 93 Real mu = (ISO_LEVEL - val0.w) / (val1.w - val0.w); 94 Vector4 normal4 = val0 + mu * (val1 - val0); 95 normal.x = normal4.x; 96 normal.y = normal4.y; 97 normal.z = normal4.z; 98 normal.normalise(); 99 return v0 + mu * (v1 - v0); 100 } 101 102 public: 103 104 /** Constructor. 105 @param src 106 The source for the isovalues and normals there. 107 */ 108 explicit IsoSurfaceMC(const Source *src); 109 110 /** Overridden from IsoSurface. 111 */ 112 virtual void addMarchingCubesTriangles(const Vector3 *corners, const Vector4 *volumeValues, MeshBuilder *mb) const; 113 114 /** Overridden from IsoSurface. 115 */ 116 virtual void addMarchingSquaresTriangles(const Vector3 *corners, const Vector4 *volumeValues, const size_t *indices, const Real maxDistance, MeshBuilder *mb) const; 117 }; 118 /** @} */ 119 /** @} */ 120 } 121 } 122 123 #endif 124