DGtal 1.3.0
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RayIntersectionPredicates.h
1
17#pragma once
18
31#if defined(RayIntersectionPredicates_RECURSES)
32#error Recursive header files inclusion detected in RayIntersectionPredicates.h
33#else // defined(RayIntersectionPredicates_RECURSES)
35#define RayIntersectionPredicates_RECURSES
36
37#if !defined RayIntersectionPredicates_h
39#define RayIntersectionPredicates_h
40
42// Inclusions
43#include <iostream>
44#include "DGtal/base/Common.h"
46
47namespace DGtal
48{
49
80 template <typename TPoint>
82 {
83
85 BOOST_STATIC_ASSERT( TPoint::dimension == 3);
86
88 typedef TPoint Point;
89
91 typedef TPoint Vector;
92
94 typedef typename TPoint::Component Component;
95
106 const Vector &dest)
107 : myOrigin(origin), myDest(dest)
108 {
110 "Direction must be non-null vector");
111 }
112
125 bool operator()(const Point &v1,
126 const Point &v2,
127 const Point &v3) const
128 {
129
130 ASSERT((v1 != v2 ) && (v1 != v3) && (v2 != v3));
131
132 Point e1, e2; //Edge1, Edge2
133 Point P, Q, T;
134 Component det, u, v;
135
136 //Find vectors for two edges sharing V1
137 e1 = v2 - v1;
138 e2 = v3 - v1;
139
140 //Begin calculating determinant - also used to calculate u parameter
141 P = myDest.crossProduct( e2 );
142
143 //if determinant is near zero, ray lies in plane of triangle
144 det = e1.dot( P );
146 {
147 return false;
148 }
149
150 //calculate distance from V1 to ray origin
151 T = myOrigin - v1;
152
153 //Calculate u parameter and test bound
154 u = T.dot( P ); //* inv_det;
155
157 {
159 ( u > det))
160 {
161 return false;
162 }
163 }
164 else
165 {
167 ( u < det))
168 {
169 return false;
170 }
171 }
172
173 //Prepare to test v parameter
174 Q = T.crossProduct( e1 );
175
176 //Calculate V parameter and test bound
177 v = myDest.dot( Q );
178
179 //The intersection lies outside of the triangle
181 {
183 ((u+v) > det))
184 {
185 return false;
186 }
187 }
188 else
189 {
191 ((u+v) < det))
192 {
193 return false;
194 }
195 }
196
197 //distance to triangle must be positive
198 Component t = e2.dot( Q ) ;
200 return false;
201
202 return true;
203 }
204
217 bool operator()(const Point &v1,
218 const Point &v2,
219 const Point &v3,
220 const Point &v4) const
221 {
222 return (this->operator()(v1,v2,v3) ||
223 this->operator()(v1,v4,v3) );
224 }
225
239 template < typename Surfel >
240 bool operator()(const Surfel &aSurfel) const
241 {
242 auto const & aPreSurfel = aSurfel.preCell();
243
244 Component x1,x2,x3,x4;
245 Component y1,y2,y3,y4;
246 Component z1,z2,z3,z4;
248
250
251 bool yodd = ( NumberTraits<Component>::castToInt64_t(aPreSurfel.coordinates[ 1 ]) & 1 );
252 bool zodd = ( NumberTraits<Component>::castToInt64_t(aPreSurfel.coordinates[ 2 ]) & 1 );
253
254 if(!zodd)
255 {
256 //zsurfel
261 }
262 else if(!yodd)
263 {
264 //ysurfel
269 }
270 else
271 {
272 //xsurfel
277 }
278 return this->operator()(Point(x1, y1, z1), Point(x2 ,y2, z2),
279 Point(x3, y3, z3), Point(x4, y4, z4));
280 }
281
284 };
285
286
287
288} // namespace DGtal
289
290// //
292
293#endif // !defined RayIntersectionPredicates_h
294
295#undef RayIntersectionPredicates_RECURSES
296#endif // else defined(RayIntersectionPredicates_RECURSES)
DGtal is the top-level namespace which contains all DGtal functions and types.
static DGtal::int64_t castToInt64_t(const std::decay< T >::type &aT)
Cast method to DGtal::int64_t (for I/O or board export uses only).
Definition: NumberTraits.h:145
Aim: The traits class for all models of Cinteger.
Definition: NumberTraits.h:564
This class implements various intersection predicates between a ray and a triangle,...
TPoint::Component Component
Type of point coordinates.
bool operator()(const Surfel &aSurfel) const
bool operator()(const Point &v1, const Point &v2, const Point &v3, const Point &v4) const
RayIntersectionPredicate(const Point &origin, const Vector &dest)
bool operator()(const Point &v1, const Point &v2, const Point &v3) const
BOOST_STATIC_ASSERT(TPoint::dimension==3)
Only in dimension 3.
Represents a signed cell in a cellular grid space by its Khalimsky coordinates and a boolean value.
SPreCell const & preCell() const
Returns the underlying constant signed pre-cell.