1 #include "float_math.h"
2 #include "meshvolume.h"
4 /*----------------------------------------------------------------------
5 Copyright (c) 2004 Open Dynamics Framework Group
9 Redistribution and use in source and binary forms, with or without modification, are permitted provided
10 that the following conditions are met:
12 Redistributions of source code must retain the above copyright notice, this list of conditions
13 and the following disclaimer.
15 Redistributions in binary form must reproduce the above copyright notice,
16 this list of conditions and the following disclaimer in the documentation
17 and/or other materials provided with the distribution.
19 Neither the name of the Open Dynamics Framework Group nor the names of its contributors may
20 be used to endorse or promote products derived from this software without specific prior written permission.
22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES,
23 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 DISCLAIMED. IN NO EVENT SHALL THE INTEL OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
27 IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 -----------------------------------------------------------------------*/
31 // http://codesuppository.blogspot.com
33 // mailto: jratcliff@infiniplex.net
35 // http://www.amillionpixels.us
38 inline float det(const float *p1,const float *p2,const float *p3)
40 return p1[0]*p2[1]*p3[2] + p2[0]*p3[1]*p1[2] + p3[0]*p1[1]*p2[2] -p1[0]*p3[1]*p2[2] - p2[0]*p1[1]*p3[2] - p3[0]*p2[1]*p1[2];
43 float computeMeshVolume(const float *vertices,unsigned int tcount,const unsigned int *indices)
47 for (unsigned int i=0; i<tcount; i++,indices+=3)
50 const float *p1 = &vertices[ indices[0]*3 ];
51 const float *p2 = &vertices[ indices[1]*3 ];
52 const float *p3 = &vertices[ indices[2]*3 ];
54 volume+=det(p1,p2,p3); // compute the volume of the tetrahedran relative to the origin.
64 inline void CrossProduct(const float *a,const float *b,float *cross)
66 cross[0] = a[1]*b[2] - a[2]*b[1];
67 cross[1] = a[2]*b[0] - a[0]*b[2];
68 cross[2] = a[0]*b[1] - a[1]*b[0];
71 inline float DotProduct(const float *a,const float *b)
73 return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
76 inline float tetVolume(const float *p0,const float *p1,const float *p2,const float *p3)
96 CrossProduct( b, c, cross );
98 float volume = DotProduct( a, cross );
106 inline float det(const float *p0,const float *p1,const float *p2,const float *p3)
108 return p1[0]*p2[1]*p3[2] + p2[0]*p3[1]*p1[2] + p3[0]*p1[1]*p2[2] -p1[0]*p3[1]*p2[2] - p2[0]*p1[1]*p3[2] - p3[0]*p2[1]*p1[2];
111 float computeMeshVolume2(const float *vertices,unsigned int tcount,const unsigned int *indices)
115 const float *p0 = vertices;
116 for (unsigned int i=0; i<tcount; i++,indices+=3)
119 const float *p1 = &vertices[ indices[0]*3 ];
120 const float *p2 = &vertices[ indices[1]*3 ];
121 const float *p3 = &vertices[ indices[2]*3 ];
123 volume+=tetVolume(p0,p1,p2,p3); // compute the volume of the tetrahdren relative to the root vertice
126 return volume * (1.0f / 6.0f );