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/**********************************************************************
 
polygonizer.h
 
This is Jules Bloomenthal's implicit surface polygonizer from GRAPHICS 
GEMS IV. Bloomenthal's polygonizer is still used and the present code
is simply the original code morphed into C++.
 
J. Andreas Bærentzen 2003.
 
**********************************************************************/
 
#ifndef POLYGONIZER_H
#define POLYGONIZER_H
 
#include <vector>
 
namespace Geometry
{
 
	enum ToTetraHedralize
		{
			TET = 0,  // use tetrahedral decomposition 
			NOTET = 1  // no tetrahedral decomposition  */
		};
 
	/** The implicit function class represents the implicit function we wish 
			to polygonize. Derive a class from this one and implement your 
			implicit primitive in the eval function. Eval takes x,y,z coordinates and
			returns a value. We assume that the surface is the zero level set 
			and that the negative values are outside. This an arbitrary choice
			which does not make the code less general. */
	class ImplicitFunction
		{
		public:
			virtual float eval(float,float,float) = 0;
		};
 
	struct POINT { float x, y, z;	};
 
	typedef POINT VERTEX;
	typedef POINT NORMAL;
 
	/** TRIANGLE struct contains the indices of the vertices comprising 
			the triangle */
	struct TRIANGLE
	{
		int v0,v1,v2;
	};
 
	/** Polygonizer is the class used to perform polygonization.*/
	class Polygonizer
		{
			std::vector<NORMAL> gnormals;  
			std::vector<VERTEX> gvertices;  
			std::vector<TRIANGLE> gtriangles;
  
			ImplicitFunction* func;
			float size;
			int bounds;
			
			bool use_tetra;
			bool use_normals;
 
		public:	
	
			/** Constructor of Polygonizer. The first argument is the 
					ImplicitFunction that we wish to polygonize. The second
					argument is the size of the polygonizing cell. 
					The third arg. is the limit to how far away we will
					look for components of the implicit surface. 
					the fourth argument indicates whether the polygonizing cell
					is a tetrahedron (true) or cube (false). The final argument
					indicates whether normals should be computed.
			*/
			Polygonizer(ImplicitFunction* _func, float _size, int _bounds,
									bool _use_tetra=false,
									bool _use_normals=false):
				func(_func), size(_size), bounds(_bounds),
				use_tetra(_use_tetra),
				use_normals(_use_normals) {}
 
			/** March erases the triangles gathered so far and builds a new 
					polygonization.  The  x,y,z 
					arguments indicate a point near the surface. */
			void march(float x, float y, float z);
 
			/** Return number of triangles generated after the polygonization.
					Call this function only when march has been called. */
			int no_triangles() const
				{
					return gtriangles.size();
				}
 
			/** Return number of vertices generated after the polygonization.
					Call this function only when march has been called. */
			int no_vertices() const
				{
					return gvertices.size();
				}
	
			/** Return number of normals generated after the polygonization.
					Of course the result of calling this function is the same as
					no_vertices.
					Call this function only when march has been called. */
			int no_normals() const
				{
					return gnormals.size();
				}
	
			/// Return triangle with index i. 
				TRIANGLE& get_triangle(int i) 
					{
						return gtriangles[i];
					}
 
				/// Return vertex with index i. 
					VERTEX& get_vertex(int i) 
						{
							return gvertices[i];
						}
	
	
					/// Return normal with index i. 
						NORMAL& get_normal(int i) 
							{
								return gnormals[i];
							}
 
 
		};
}
 
#endif
 

Rev 64	Rev 67
1	`/**********************************************************************`	1	`/**********************************************************************`
2		2
3	`polygonizer.h`	3	`polygonizer.h`
4		4
5	`This is Jules Bloomenthal's implicit surface polygonizer from GRAPHICS`	5	`This is Jules Bloomenthal's implicit surface polygonizer from GRAPHICS`
6	`GEMS IV. Bloomenthal's polygonizer is still used and the present code`	6	`GEMS IV. Bloomenthal's polygonizer is still used and the present code`
7	`is simply the original code morphed into C++.`	7	`is simply the original code morphed into C++.`
8		8
9	`J. Andreas Bærentzen 2003.`	9	`J. Andreas Bærentzen 2003.`
10		10
11	`**********************************************************************/`	11	`**********************************************************************/`
12		12
13	`#ifndef POLYGONIZER_H`	13	`#ifndef POLYGONIZER_H`
14	`#define POLYGONIZER_H`	14	`#define POLYGONIZER_H`
15		15
16	`#include <vector>`	16	`#include <vector>`
17		17
18	`namespace Geometry`	18	`namespace Geometry`
19	`{`	19	`{`
20		20
21	`enum ToTetraHedralize`	21	`enum ToTetraHedralize`
22	`{`	22	`{`
23	`TET = 0, // use tetrahedral decomposition`	23	`TET = 0, // use tetrahedral decomposition`
24	`NOTET = 1 // no tetrahedral decomposition */`	24	`NOTET = 1 // no tetrahedral decomposition */`
25	`};`	25	`};`
26		26
27	`/** The implicit function class represents the implicit function we wish`	27	`/** The implicit function class represents the implicit function we wish`
28	`to polygonize. Derive a class from this one and implement your`	28	`to polygonize. Derive a class from this one and implement your`
29	`implicit primitive in the eval function. Eval takes x,y,z coordinates and`	29	`implicit primitive in the eval function. Eval takes x,y,z coordinates and`
30	`returns a value. We assume that the surface is the zero level set`	30	`returns a value. We assume that the surface is the zero level set`
31	`and that the negative values are outside. This an arbitrary choice`	31	`and that the negative values are outside. This an arbitrary choice`
32	`which does not make the code less general. */`	32	`which does not make the code less general. */`
33	`class ImplicitFunction`	33	`class ImplicitFunction`
34	`{`	34	`{`
35	`public:`	35	`public:`
36	`virtual float eval(float,float,float) = 0;`	36	`virtual float eval(float,float,float) = 0;`
37	`};`	37	`};`
38		38
39	`struct POINT { float x, y, z; };`	39	`struct POINT { float x, y, z; };`
40		40
41	`typedef POINT VERTEX;`	41	`typedef POINT VERTEX;`
42	`typedef POINT NORMAL;`	42	`typedef POINT NORMAL;`
43		43
44	`/** TRIANGLE struct contains the indices of the vertices comprising`	44	`/** TRIANGLE struct contains the indices of the vertices comprising`
45	`the triangle */`	45	`the triangle */`
46	`struct TRIANGLE`	46	`struct TRIANGLE`
47	`{`	47	`{`
48	`int v0,v1,v2;`	48	`int v0,v1,v2;`
49	`};`	49	`};`
50		50
51	`/** Polygonizer is the class used to perform polygonization.*/`	51	`/** Polygonizer is the class used to perform polygonization.*/`
52	`class Polygonizer`	52	`class Polygonizer`
53	`{`	53	`{`
54	`std::vector<NORMAL> gnormals;`	54	`std::vector<NORMAL> gnormals;`
55	`std::vector<VERTEX> gvertices;`	55	`std::vector<VERTEX> gvertices;`
56	`std::vector<TRIANGLE> gtriangles;`	56	`std::vector<TRIANGLE> gtriangles;`
57		57
58	`ImplicitFunction* func;`	58	`ImplicitFunction* func;`
59	`float size;`	59	`float size;`
60	`int bounds;`	60	`int bounds;`
61		61
62	`bool use_tetra;`	62	`bool use_tetra;`
63	`bool use_normals;`	63	`bool use_normals;`
64		64
65	`public:`	65	`public:`
66		66
67	`/** Constructor of Polygonizer. The first argument is the`	67	`/** Constructor of Polygonizer. The first argument is the`
68	`ImplicitFunction that we wish to polygonize. The second`	68	`ImplicitFunction that we wish to polygonize. The second`
69	`argument is the size of the polygonizing cell.`	69	`argument is the size of the polygonizing cell.`
70	`The third arg. is the limit to how far away we will`	70	`The third arg. is the limit to how far away we will`
71	`look for components of the implicit surface.`	71	`look for components of the implicit surface.`
72	`the fourth argument indicates whether the polygonizing cell`	72	`the fourth argument indicates whether the polygonizing cell`
73	`is a tetrahedron (true) or cube (false). The final argument`	73	`is a tetrahedron (true) or cube (false). The final argument`
74	`indicates whether normals should be computed.`	74	`indicates whether normals should be computed.`
75	`*/`	75	`*/`
76	`Polygonizer(ImplicitFunction* _func, float _size, int _bounds,`	76	`Polygonizer(ImplicitFunction* _func, float _size, int _bounds,`
77	`bool _use_tetra=false,`	77	`bool _use_tetra=false,`
78	`bool _use_normals=false):`	78	`bool _use_normals=false):`
79	`func(_func), size(_size), bounds(_bounds),`	79	`func(_func), size(_size), bounds(_bounds),`
80	`use_tetra(_use_tetra),`	80	`use_tetra(_use_tetra),`
81	`use_normals(_use_normals) {}`	81	`use_normals(_use_normals) {}`
82		82
83	`/** March erases the triangles gathered so far and builds a new`	83	`/** March erases the triangles gathered so far and builds a new`
84	`polygonization. The x,y,z`	84	`polygonization. The x,y,z`
85	`arguments indicate a point near the surface. */`	85	`arguments indicate a point near the surface. */`
86	`void march(float x, float y, float z);`	86	`void march(float x, float y, float z);`
87		87
88	`/** Return number of triangles generated after the polygonization.`	88	`/** Return number of triangles generated after the polygonization.`
89	`Call this function only when march has been called. */`	89	`Call this function only when march has been called. */`
90	`int no_triangles() const`	90	`int no_triangles() const`
91	`{`	91	`{`
92	`return gtriangles.size();`	92	`return gtriangles.size();`
93	`}`	93	`}`
94		94
95	`/** Return number of vertices generated after the polygonization.`	95	`/** Return number of vertices generated after the polygonization.`
96	`Call this function only when march has been called. */`	96	`Call this function only when march has been called. */`
97	`int no_vertices() const`	97	`int no_vertices() const`
98	`{`	98	`{`
99	`return gvertices.size();`	99	`return gvertices.size();`
100	`}`	100	`}`
101		101
102	`/** Return number of normals generated after the polygonization.`	102	`/** Return number of normals generated after the polygonization.`
103	`Of course the result of calling this function is the same as`	103	`Of course the result of calling this function is the same as`
104	`no_vertices.`	104	`no_vertices.`
105	`Call this function only when march has been called. */`	105	`Call this function only when march has been called. */`
106	`int no_normals() const`	106	`int no_normals() const`
107	`{`	107	`{`
108	`return gnormals.size();`	108	`return gnormals.size();`
109	`}`	109	`}`
110		110
111	`/// Return triangle with index i.`	111	`/// Return triangle with index i.`
112	`TRIANGLE& get_triangle(int i)`	112	`TRIANGLE& get_triangle(int i)`
113	`{`	113	`{`
114	`return gtriangles[i];`	114	`return gtriangles[i];`
115	`}`	115	`}`
116		116
117	`/// Return vertex with index i.`	117	`/// Return vertex with index i.`
118	`VERTEX& get_vertex(int i)`	118	`VERTEX& get_vertex(int i)`
119	`{`	119	`{`
120	`return gvertices[i];`	120	`return gvertices[i];`
121	`}`	121	`}`
122		122
123		123
124	`/// Return normal with index i.`	124	`/// Return normal with index i.`
125	`NORMAL& get_normal(int i)`	125	`NORMAL& get_normal(int i)`
126	`{`	126	`{`
127	`return gnormals[i];`	127	`return gnormals[i];`
128	`}`	128	`}`
129		129
130		130
131	`};`	131	`};`
132	`}`	132	`}`
133		133
134	`#endif`	134	`#endif`
135		135

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