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include/engine/core/iso_surface.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__NISOSURFACE__
+#define	__NISOSURFACE__
+
+
+		#include "math/vector.h"
+		#include "thread/mutex.h"
+
+
+namespace GS {
+	namespace Core {
+		class Geometry;
+
+/*!
+	@short	Isosurface.
+	@author Thomas Simonnet (scorpheus@hotmail.com)
+*/
+class	Isosurface
+{
+private:
+
+	static const int EdgeArray[256];
+	static const int TriTable[256][16];
+
+	Vector4		m_Pos;
+
+	// grid definition
+	Vector4		m_NbGridCase;
+	float		*m_Grid;
+	Vector4		m_GridSize;
+
+	float		m_IsoValue;
+	
+	// to know on which point of the grid we have to create a triangle
+	Vector4 *	m_TabIndexValid;
+	int		m_NbIndexValid;
+
+	// to precalculate
+	Vector4 m_CaseSizeDivNbCase;
+
+
+	struct STriangle
+	{
+		Vector4 m_Vertex[3];		// the 3 vertex of the triangle
+		int m_Num[3];		// number of the side who have each vertex
+	};	
+
+	struct TVertex
+	{
+		float x, y, z;       // Position
+		float nx, ny, nz;       // Normal
+		float u, v;       // UV coordinate
+		unsigned long Color; // Color
+
+		TVertex(){x=y=z=nx=ny=u=0;  nz=v=1; Color =0xFF19E395;};
+	};
+
+	inline	void CalcNormalX(float &_x, float &_y, float &_z, Vector4 &_Normal);
+	inline	void CalcNormalY(float &_x, float &_y, float &_z, Vector4 &_Normal);
+	inline	void CalcNormalZ(float &_x, float &_y, float &_z, Vector4 &_Normal);
+
+	// function permit to linear interpolate between vector
+	void interpolateVect(Vector4 &_Vect1, Vector4 &_Vect2, float &_Val1, float &_Val2, Vector4&_Vect);
+
+	// function permit to linear interpolate between val
+	float interpolateVal(float &_Val1, float &_Val2, float _Val_cible1, float _Val_cible2);
+
+	// Set the value of the vertex
+	void EvalPos(float &_x, float &_y, float &_z, Vector4 &_CasePosition);
+
+	// return the good float with the 3d parameter in the grid
+	int GridIndex(float &_x, float &_y, float &_z)const;
+
+	/// calcul the polygon for one case, and return the number of triangle for the polygon
+	int	CalculPolygon(float &_x, float &_y, float &_z, STriangle* _TriangleList);
+
+	// draw the triangle in the cellule x,y, z
+	void		RenderCell(uint &vtx_count, float &_x, float &_y, float &_z);
+
+	// compute the metaball array to fill the grid with ball
+	void		ComputeMetaball(int nb_metaball, Vector4* pos_metaball, float* value_metaball);
+
+	Threading::Mutex m_Mutex;
+
+public:
+
+	//max vertex to build the mesh
+	static uint m_MaxNbVertex;
+
+	// temp for build the mesh
+	static int m_MaxIdx;
+	int m_CountIdxBuffer;
+	static int* m_TempIdxBuffer ; // index buffer containing the geometry
+
+	// temp for build the mesh
+	static TVertex* m_TempVertexBuffer ; // Vertex buffer containing the geometry
+
+		/// Initialize the iso-surface field
+		bool		Init(const Vector4 &_pos, const Vector4 &size, const Vector4 &step);
+
+		/// Get the iso-surface field size
+		void		GetFieldSize(int &x, int &y, int &z);
+
+		/// Get the iso-surface field
+		void		GetField(float *_Grid);
+
+		/// Triangularize the iso-surface
+		void		Triangularize(Geometry* geometry, int nb_metaball, Vector4* pos_metaball, float* value_metaball);
+
+		Isosurface();
+virtual	~Isosurface();
+};
+
+	} // Core
+} // GS
+
+
+#endif	// __NISOSURFACE__