[37] | 1 | /* |
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| 2 | |
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| 3 | Compute the volume of a mesh |
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| 4 | |
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| 5 | Sean Anderson, February 1999 |
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| 6 | |
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| 7 | */ |
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| 8 | |
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| 9 | #include <assert.h> |
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| 10 | #include <stdio.h> |
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| 11 | #include <ply.h> |
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| 12 | #include <stdlib.h> |
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| 13 | #include <strings.h> |
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| 14 | #include <iostream> |
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| 15 | #include <limits.h> |
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| 16 | |
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| 17 | #include <Linear.h> |
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| 18 | |
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| 19 | #include <vector.h> |
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| 20 | |
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| 21 | //#include "plyio.h" |
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| 22 | |
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| 23 | |
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| 24 | typedef Vec3f PlyVertex; |
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| 25 | |
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| 26 | |
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| 27 | struct PlyFace |
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| 28 | { |
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| 29 | uchar nverts; |
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| 30 | int * verts; |
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| 31 | }; |
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| 32 | |
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| 33 | struct PlyTriStrip |
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| 34 | { |
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| 35 | int nverts; |
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| 36 | int * verts; |
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| 37 | }; |
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| 38 | |
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| 39 | #define MAX_VERT_PROPS 3 |
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| 40 | |
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| 41 | static PlyProperty vert_prop_x = |
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| 42 | {"x", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}; |
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| 43 | static PlyProperty vert_prop_y = |
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| 44 | {"y", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}; |
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| 45 | static PlyProperty vert_prop_z = |
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| 46 | {"z", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}; |
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| 47 | |
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| 48 | |
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| 49 | static PlyProperty vert_props[MAX_VERT_PROPS]; |
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| 50 | |
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| 51 | |
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| 52 | static PlyProperty face_props[] = |
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| 53 | { |
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| 54 | {"vertex_indices", PLY_INT, PLY_INT, 0, 1, PLY_UCHAR, PLY_UCHAR, 0}, |
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| 55 | }; |
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| 56 | |
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| 57 | static PlyProperty tristrip_props[] = |
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| 58 | { |
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| 59 | {"vertex_indices", PLY_INT, PLY_INT, 0, 1, PLY_INT, PLY_INT}, |
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| 60 | }; |
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| 61 | |
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| 62 | #define voffset(field) ((int) &(((PlyVertex *) 0)->field)) |
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| 63 | #define foffset(field) ((int) &(((PlyFace *) 0)->field)) |
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| 64 | |
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| 65 | |
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| 66 | |
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| 67 | class Plane |
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| 68 | { |
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| 69 | public: |
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| 70 | Plane() |
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| 71 | { |
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| 72 | n = Vec3f(0, 0, 1); |
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| 73 | d = 0; |
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| 74 | } |
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| 75 | Vec3f n; |
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| 76 | float d; |
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| 77 | }; |
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| 78 | |
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| 79 | inline void |
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| 80 | computeFaceContribution(const vector<PlyVertex> & verts, |
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| 81 | const PlyFace & plyFace, |
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| 82 | const Plane & plane, |
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| 83 | double * subvolume, |
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| 84 | double * subarea) |
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| 85 | { |
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| 86 | const int * v = plyFace.verts; |
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| 87 | const int k = plyFace.nverts; |
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| 88 | Vec3f area; |
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| 89 | float vol; |
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| 90 | Vec3f avePt; |
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| 91 | |
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| 92 | if (k == 3) // Make the common case fast: triangle |
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| 93 | { |
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| 94 | area = 0.5 * |
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| 95 | (verts[v[1]] - verts[v[0]]).cross(verts[v[2]] - verts[v[0]]); |
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| 96 | avePt = (1. / 3) * (verts[v[0]] + verts[v[1]] + verts[v[2]]); |
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| 97 | vol = (plane.n.dot(avePt) - plane.d) * plane.n.dot(area); |
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| 98 | } |
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| 99 | else |
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| 100 | { |
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| 101 | area.clear(); |
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| 102 | vol = 0; |
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| 103 | const Vec3f v0 = verts[v[0]]; |
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| 104 | for (int i = 0; i < k - 1; i++) |
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| 105 | { |
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| 106 | Vec3f a = (verts[v[i]] - v0).cross(verts[v[i + 1]] - v0); |
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| 107 | area += a; |
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| 108 | avePt = (1. / 3) * (v0 + verts[v[i]] + verts[v[i + 1]]); |
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| 109 | vol += (plane.n.dot(avePt) - plane.d) * plane.n.dot(a); |
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| 110 | } |
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| 111 | vol *= 0.5; |
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| 112 | area *= 0.5; |
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| 113 | } |
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| 114 | |
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| 115 | if (subvolume) |
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| 116 | { |
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| 117 | *subvolume += vol; |
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| 118 | } |
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| 119 | if (subarea) |
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| 120 | { |
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| 121 | *subarea += area.length(); |
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| 122 | } |
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| 123 | } |
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| 124 | |
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| 125 | |
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| 126 | // |
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| 127 | // Read in data from the ply file and compute the volume and area of faces |
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| 128 | // with plane. The volume and area contributions are ADDED to what was |
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| 129 | // passed in. |
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| 130 | // |
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| 131 | |
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| 132 | bool |
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| 133 | computeSignedVolume(FILE * fp, const Plane & plane, |
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| 134 | double * volume, double * area) |
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| 135 | { |
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| 136 | int j; |
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| 137 | int nelems; |
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| 138 | char ** elist; |
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| 139 | int file_type; |
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| 140 | float version; |
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| 141 | char * elem_name; |
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| 142 | int num_vert_props; |
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| 143 | int num_elems; |
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| 144 | |
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| 145 | vector<PlyVertex> verts; |
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| 146 | |
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| 147 | face_props[0].offset = foffset(verts); |
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| 148 | face_props[0].count_offset = foffset(nverts); /* count offset */ |
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| 149 | |
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| 150 | PlyFile * ply = |
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| 151 | ply_read(fp, &nelems, &elist); |
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| 152 | |
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| 153 | |
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| 154 | if (!ply) |
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| 155 | { |
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| 156 | return true; |
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| 157 | } |
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| 158 | |
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| 159 | int nvp = 0; |
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| 160 | |
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| 161 | if (ply_is_valid_property(ply, "vertex", vert_prop_x.name)) |
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| 162 | { |
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| 163 | vert_props[nvp] = vert_prop_x; |
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| 164 | vert_props[nvp].offset = voffset(x); |
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| 165 | nvp++; |
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| 166 | } |
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| 167 | |
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| 168 | if (ply_is_valid_property(ply, "vertex", vert_prop_y.name)) |
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| 169 | { |
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| 170 | vert_props[nvp] = vert_prop_y; |
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| 171 | vert_props[nvp].offset = voffset(y); |
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| 172 | nvp++; |
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| 173 | } |
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| 174 | |
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| 175 | if (ply_is_valid_property(ply, "vertex", vert_prop_z.name)) |
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| 176 | { |
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| 177 | vert_props[nvp] = vert_prop_z; |
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| 178 | vert_props[nvp].offset = voffset(z); |
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| 179 | nvp++; |
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| 180 | } |
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| 181 | |
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| 182 | |
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| 183 | num_vert_props = nvp; |
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| 184 | |
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| 185 | PlyVertex plyVert; |
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| 186 | PlyFace plyFace; |
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| 187 | int faceIndicesMem[256]; |
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| 188 | plyFace.verts = faceIndicesMem; |
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| 189 | |
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| 190 | for (int i = 0; i < nelems; i++) |
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| 191 | { |
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| 192 | /* get the description of the first element */ |
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| 193 | elem_name = elist[i]; |
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| 194 | int nprops; |
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| 195 | ply_get_element_description(ply, elem_name, &num_elems, &nprops); |
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| 196 | |
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| 197 | /* if we're on vertex elements, read them in */ |
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| 198 | if (equal_strings("vertex", elem_name)) |
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| 199 | { |
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| 200 | /* set up for getting vertex elements */ |
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| 201 | ply_get_element_setup(ply, elem_name, num_vert_props, vert_props); |
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| 202 | |
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| 203 | cerr << "Reading vertices . . .\n"; |
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| 204 | |
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| 205 | int percent = -1; |
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| 206 | |
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| 207 | /* grab all the vertex elements */ |
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| 208 | for (j = 0; j < num_elems; j++) |
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| 209 | { |
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| 210 | int newpercent = 100 * j / num_elems; |
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| 211 | if (newpercent != percent) |
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| 212 | { |
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| 213 | cerr << "\r" << (percent = newpercent) << "% complete" ; |
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| 214 | cerr.flush(); |
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| 215 | } |
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| 216 | |
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| 217 | ply_get_element_noalloc(ply, (void *) &plyVert); |
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| 218 | |
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| 219 | verts.push_back(plyVert); |
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| 220 | } |
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| 221 | |
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| 222 | cerr << "\rDone. \n"; |
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| 223 | } |
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| 224 | else if (equal_strings("face", elem_name)) |
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| 225 | { |
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| 226 | ply_get_element_setup(ply, elem_name, 1, face_props); |
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| 227 | |
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| 228 | if (num_elems == 0) |
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| 229 | { |
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| 230 | continue; |
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| 231 | } |
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| 232 | |
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| 233 | cerr << "Reading faces . . .\n"; |
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| 234 | |
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| 235 | if (verts.size() == 0) |
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| 236 | { |
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| 237 | cerr << "No vertices read yet; can't read faces\n"; |
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| 238 | continue; |
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| 239 | } |
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| 240 | |
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| 241 | int percent = -1; |
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| 242 | |
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| 243 | for (j = 0; j < num_elems; j++) |
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| 244 | { |
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| 245 | int newpercent = 100 * j / num_elems; |
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| 246 | if (newpercent != percent) |
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| 247 | { |
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| 248 | cerr << "\r" << (percent = newpercent) << "% complete"; |
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| 249 | cerr.flush(); |
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| 250 | } |
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| 251 | |
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| 252 | ply_get_element_noalloc(ply, (void *) &plyFace); |
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| 253 | assert(plyFace.verts == faceIndicesMem); |
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| 254 | |
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| 255 | computeFaceContribution(verts, plyFace, plane, volume, area); |
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| 256 | |
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| 257 | //faces->push_back(plyFace); |
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| 258 | } |
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| 259 | |
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| 260 | cerr << "\rDone. \n"; |
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| 261 | } |
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| 262 | else if (equal_strings("tristrips", elem_name)) |
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| 263 | { |
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| 264 | ply_get_element_setup(ply, elem_name, 1, tristrip_props); |
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| 265 | |
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| 266 | if (num_elems == 0) |
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| 267 | { |
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| 268 | continue; |
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| 269 | } |
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| 270 | |
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| 271 | cerr << "Reading tristrips . . .\n"; |
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| 272 | |
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| 273 | if (verts.size() == 0) |
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| 274 | { |
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| 275 | cerr << "No vertices read yet; can't read tristrip\n"; |
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| 276 | continue; |
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| 277 | } |
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| 278 | |
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| 279 | PlyTriStrip plyTriStrip; |
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| 280 | |
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| 281 | for (j = 0; j < num_elems; j++) |
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| 282 | { |
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| 283 | ply_get_element(ply, (void *) &plyTriStrip); |
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| 284 | |
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| 285 | int percent = -1; |
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| 286 | |
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| 287 | bool clockwise = false; |
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| 288 | for (int k = 2; k < plyTriStrip.nverts; ) |
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| 289 | { |
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| 290 | int newpercent = 100 * j / num_elems; |
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| 291 | if (newpercent != percent) |
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| 292 | { |
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| 293 | cerr << "\r" << (percent = newpercent) << "% complete"; |
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| 294 | cerr.flush(); |
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| 295 | } |
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| 296 | |
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| 297 | plyFace.nverts = 3; |
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| 298 | //plyFace.verts = new int[3]; |
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| 299 | plyFace.verts[0] = plyTriStrip.verts[k - 2]; |
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| 300 | plyFace.verts[1 + clockwise] = plyTriStrip.verts[k - 1]; |
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| 301 | plyFace.verts[2 - clockwise] = plyTriStrip.verts[k - 0]; |
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| 302 | |
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| 303 | computeFaceContribution(verts, plyFace, plane, |
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| 304 | volume, area); |
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| 305 | |
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| 306 | //faces->push_back(plyFace); |
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| 307 | |
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| 308 | clockwise = !clockwise; |
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| 309 | |
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| 310 | k++; |
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| 311 | |
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| 312 | if (k < plyTriStrip.nverts && plyTriStrip.verts[k] == -1) |
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| 313 | { |
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| 314 | k += 3; |
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| 315 | clockwise = false; |
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| 316 | } |
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| 317 | } |
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| 318 | |
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| 319 | free(plyTriStrip.verts); |
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| 320 | } |
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| 321 | |
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| 322 | cerr << "\rDone. \n"; |
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| 323 | } |
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| 324 | } |
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| 325 | |
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| 326 | ply_close(ply); |
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| 327 | |
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| 328 | return false; |
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| 329 | } |
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| 330 | |
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| 331 | void |
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| 332 | printUsage(const char * name) |
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| 333 | { |
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| 334 | cerr << "Usage:\n" |
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| 335 | << " " << name |
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| 336 | << " -h | [-p nx ny nz d] (- | file1.ply [file2.ply [...]])\n" |
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| 337 | << "where:\n" |
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| 338 | << " -h Displays this help\n" |
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| 339 | << " -p Specifies a plane to use as the base; \n" |
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| 340 | " the plane has normal (nx, ny, nz) and is distance \n" |
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| 341 | " d from the origin in the normal's direction\n" |
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| 342 | << " - Reads one ply file from standard input\n" |
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| 343 | << " file.ply Is a ply file whose volume is added to the total.\n"; |
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| 344 | } |
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| 345 | |
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| 346 | int |
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| 347 | main(int argc, char * argv[]) |
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| 348 | { |
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| 349 | double volume = 0, area = 0; |
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| 350 | Plane plane; |
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| 351 | |
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| 352 | for (int c = 1; c < argc; c++) |
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| 353 | { |
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| 354 | if (!strcmp("-h", argv[c])) |
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| 355 | { |
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| 356 | printUsage(argv[0]); |
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| 357 | return 1; |
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| 358 | } |
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| 359 | else if (!strcmp("-p", argv[c])) |
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| 360 | { |
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| 361 | if (c + 4 >= argc) |
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| 362 | { |
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| 363 | cerr << "Insufficient parameters for plane description\n"; |
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| 364 | return 1; |
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| 365 | } |
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| 366 | else |
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| 367 | { |
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| 368 | plane.n.x = atof(argv[c + 1]); |
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| 369 | plane.n.y = atof(argv[c + 2]); |
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| 370 | plane.n.z = atof(argv[c + 3]); |
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| 371 | plane.d = atof(argv[c + 4]); |
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| 372 | c += 4; |
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| 373 | } |
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| 374 | } |
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| 375 | else if (!strcmp("-", argv[c])) |
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| 376 | { |
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| 377 | cerr << "stdin:\n"; |
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| 378 | if (computeSignedVolume(stdin, plane, &volume, &area)) |
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| 379 | { |
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| 380 | cerr << "Couldn't read ply file from stdin\n"; |
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| 381 | } |
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| 382 | } |
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| 383 | else |
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| 384 | { |
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| 385 | cerr << argv[c] << ":\n"; |
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| 386 | FILE * fp = fopen(argv[c], "r"); |
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| 387 | if (!fp) |
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| 388 | { |
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| 389 | cerr << "Couldn't open file '" << argv[c] << "'\n"; |
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| 390 | } |
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| 391 | else |
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| 392 | { |
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| 393 | if (computeSignedVolume(fp, plane, &volume, &area)) |
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| 394 | { |
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| 395 | cerr << "Couldn't read ply file '" << argv[c] << "'\n"; |
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| 396 | } |
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| 397 | fclose(fp); |
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| 398 | } |
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| 399 | } |
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| 400 | } |
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| 401 | |
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| 402 | //cout.flags(ios::fixed); |
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| 403 | cout.precision(10); |
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| 404 | cout << "Volume: " << volume << endl |
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| 405 | << "Area: " << area << endl; |
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| 406 | |
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| 407 | return 0; |
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| 408 | } |
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