1 | #include "VssRay.h"
|
---|
2 | #include "AxisAlignedBox3.h"
|
---|
3 |
|
---|
4 | namespace GtpVisibilityPreprocessor {
|
---|
5 |
|
---|
6 | // Static variables
|
---|
7 | int
|
---|
8 | VssRay::mailID = 0;
|
---|
9 |
|
---|
10 |
|
---|
11 | VssRay::VssRay(
|
---|
12 | const Vector3 &origin,
|
---|
13 | const Vector3 &termination,
|
---|
14 | Intersectable *originObject,
|
---|
15 | Intersectable *terminationObject,
|
---|
16 | const int pass,
|
---|
17 | const float pdf
|
---|
18 | ):
|
---|
19 | mMailbox(-1),
|
---|
20 | mOrigin(origin),
|
---|
21 | mTermination(termination),
|
---|
22 | mOriginObject(originObject),
|
---|
23 | mTerminationObject(terminationObject),
|
---|
24 | mRefCount(0),
|
---|
25 | mFlags(0),
|
---|
26 | mPass(pass),
|
---|
27 | mViewCells(0),
|
---|
28 | mWeightedPvsContribution(0),
|
---|
29 | mPdf(pdf),
|
---|
30 | mTerminationNode(NULL),
|
---|
31 | mOriginNode(NULL),
|
---|
32 | mPvsContribution(0)
|
---|
33 | {
|
---|
34 | Precompute();
|
---|
35 | }
|
---|
36 |
|
---|
37 |
|
---|
38 | VssRay::VssRay(const Ray &ray):
|
---|
39 | mRefCount(0),
|
---|
40 | mFlags(0),
|
---|
41 | mMailbox(-1),
|
---|
42 | mOriginObject(ray.sourceObject.mObject),
|
---|
43 | mPass(0),
|
---|
44 | mViewCells(0),
|
---|
45 | mPdf(1.0f),
|
---|
46 | mTerminationNode(NULL),
|
---|
47 | mOriginNode(NULL),
|
---|
48 | mPvsContribution(0)
|
---|
49 | {
|
---|
50 | if (ray.sourceObject.mObject)
|
---|
51 | mOrigin = ray.Extrap(ray.sourceObject.mT);
|
---|
52 | else
|
---|
53 | mOrigin = ray.GetLoc();
|
---|
54 |
|
---|
55 | //Debug << "origin: " << mOrigin << endl;
|
---|
56 | if (!ray.intersections.empty())
|
---|
57 | {
|
---|
58 | mTermination = ray.Extrap(ray.intersections[0].mT);
|
---|
59 | mTerminationObject = ray.intersections[0].mObject;
|
---|
60 | }
|
---|
61 | else
|
---|
62 | {
|
---|
63 | mTermination = ray.Extrap(1e6);//TODO: should be Limits::Infinity
|
---|
64 | mTerminationObject = NULL;
|
---|
65 | }
|
---|
66 |
|
---|
67 | Precompute();
|
---|
68 | }
|
---|
69 |
|
---|
70 |
|
---|
71 | void VssRay::Precompute()
|
---|
72 | {
|
---|
73 | mFlags = 0;
|
---|
74 | Vector3 dir = GetDir();
|
---|
75 | //mFlags |= BorderSample;
|
---|
76 | #define BIDIRECTIONAL_RAY 0
|
---|
77 | #if BIDIRECTIONAL_RAY
|
---|
78 | if (dir.y < 0) {
|
---|
79 | // swap objects and poits
|
---|
80 | swap(mOriginObject, mTerminationObject);
|
---|
81 | swap(mOrigin, mTermination);
|
---|
82 | dir = -dir;
|
---|
83 | }
|
---|
84 | #endif
|
---|
85 | if (dir.x > 0.0f) mFlags |= FPosDirX;
|
---|
86 | if (dir.y > 0.0f) mFlags |= FPosDirY;
|
---|
87 | if (dir.z > 0.0f) mFlags |= FPosDirZ;
|
---|
88 |
|
---|
89 | mInvSize = 1.0f/Magnitude(GetDir());
|
---|
90 | }
|
---|
91 |
|
---|
92 |
|
---|
93 | bool
|
---|
94 | VssRay::ComputeMinMaxT(const AxisAlignedBox3 &box,
|
---|
95 | float &tmin,
|
---|
96 | float &tmax) const
|
---|
97 | {
|
---|
98 |
|
---|
99 | float minx, maxx, miny, maxy, minz, maxz;
|
---|
100 | Vector3 dir = GetDir();
|
---|
101 |
|
---|
102 | if (fabs(dir.x) < 0.001) {
|
---|
103 | if (box.Min().x < GetOrigin().x && box.Max().x > GetOrigin().x) {
|
---|
104 | minx = -MAXFLOAT;
|
---|
105 | maxx = MAXFLOAT;
|
---|
106 | }
|
---|
107 | else
|
---|
108 | return false;
|
---|
109 | }
|
---|
110 | else {
|
---|
111 | float t1 = (box.Min().x - GetOrigin().x) / dir.x;
|
---|
112 | float t2 = (box.Max().x - GetOrigin().x) / dir.x;
|
---|
113 | if (t1 < t2) {
|
---|
114 | minx = t1;
|
---|
115 | maxx = t2;
|
---|
116 | }
|
---|
117 | else {
|
---|
118 | minx = t2;
|
---|
119 | maxx = t1;
|
---|
120 | }
|
---|
121 | if (maxx < 0)
|
---|
122 | return false;
|
---|
123 | }
|
---|
124 |
|
---|
125 | if (fabs(dir.y) < 0.001) {
|
---|
126 | if (box.Min().y < GetOrigin().y && box.Max().y > GetOrigin().y) {
|
---|
127 | miny = -MAXFLOAT;
|
---|
128 | maxy = MAXFLOAT;
|
---|
129 | }
|
---|
130 | else
|
---|
131 | return false;
|
---|
132 | }
|
---|
133 | else {
|
---|
134 | float t1 = (box.Min().y - GetOrigin().y) / dir.y;
|
---|
135 | float t2 = (box.Max().y - GetOrigin().y) / dir.y;
|
---|
136 | if (t1 < t2) {
|
---|
137 | miny = t1;
|
---|
138 | maxy = t2;
|
---|
139 | }
|
---|
140 | else {
|
---|
141 | miny = t2;
|
---|
142 | maxy = t1;
|
---|
143 | }
|
---|
144 | if (maxy < 0.0)
|
---|
145 | return false;
|
---|
146 | }
|
---|
147 |
|
---|
148 | if (fabs(dir.z) < 0.001) {
|
---|
149 | if (box.Min().z < GetOrigin().z && box.Max().z > GetOrigin().z) {
|
---|
150 | minz = -MAXFLOAT;
|
---|
151 | maxz = MAXFLOAT;
|
---|
152 | }
|
---|
153 | else
|
---|
154 | return false;
|
---|
155 | }
|
---|
156 | else {
|
---|
157 | float t1 = (box.Min().z - GetOrigin().z) / dir.z;
|
---|
158 | float t2 = (box.Max().z - GetOrigin().z) / dir.z;
|
---|
159 | if (t1 < t2) {
|
---|
160 | minz = t1;
|
---|
161 | maxz = t2;
|
---|
162 | }
|
---|
163 | else {
|
---|
164 | minz = t2;
|
---|
165 | maxz = t1;
|
---|
166 | }
|
---|
167 | if (maxz < 0.0)
|
---|
168 | return false;
|
---|
169 | }
|
---|
170 |
|
---|
171 | tmin = minx;
|
---|
172 | if (miny > tmin)
|
---|
173 | tmin = miny;
|
---|
174 | if (minz > tmin)
|
---|
175 | tmin = minz;
|
---|
176 |
|
---|
177 | tmax = maxx;
|
---|
178 | if (maxy < tmax)
|
---|
179 | tmax = maxy;
|
---|
180 | if (maxz < tmax)
|
---|
181 | tmax = maxz;
|
---|
182 |
|
---|
183 | return 1; // yes, intersection was found
|
---|
184 | }
|
---|
185 |
|
---|
186 |
|
---|
187 |
|
---|
188 | bool
|
---|
189 | VssRay::Intersects(const AxisAlignedBox3 &box,
|
---|
190 | float &tmin,
|
---|
191 | float &tmax) const
|
---|
192 | {
|
---|
193 | if (!ComputeMinMaxT(box, tmin, tmax))
|
---|
194 | return false;
|
---|
195 |
|
---|
196 | if ( tmax < tmin)
|
---|
197 | return false; // the ray passes outside the box
|
---|
198 |
|
---|
199 | if ( tmax < 0.0f)
|
---|
200 | return false; // the intersection is not on the positive halfline
|
---|
201 |
|
---|
202 | return true; // ray hits the box .. origin can be outside or inside the box
|
---|
203 | }
|
---|
204 |
|
---|
205 |
|
---|
206 | bool
|
---|
207 | VssRay::IntersectsSphere(const Vector3 ¢er,
|
---|
208 | const float sqrRadius,
|
---|
209 | Vector3 &point,
|
---|
210 | float &t) const
|
---|
211 | {
|
---|
212 | // compute ray/plane intersection
|
---|
213 | Vector3 dir = GetDir();
|
---|
214 |
|
---|
215 | t = -DotProd(GetOrigin() - center, dir)*sqr(GetInvSize());
|
---|
216 |
|
---|
217 | if (t < 0.0f)
|
---|
218 | t = 0.0f;
|
---|
219 | else
|
---|
220 | if (t > 1.0f)
|
---|
221 | t = 1.0f;
|
---|
222 |
|
---|
223 | point = GetOrigin() + t*dir;
|
---|
224 |
|
---|
225 | return GtpVisibilityPreprocessor::SqrDistance(point, center) < sqrRadius;
|
---|
226 | }
|
---|
227 |
|
---|
228 |
|
---|
229 | float
|
---|
230 | VssRay::GetDirParam(const int axis, const Vector3 dir)
|
---|
231 | {
|
---|
232 | return (axis == 0) ? atan2(dir.x, dir.z) : asin(dir.y);
|
---|
233 | }
|
---|
234 |
|
---|
235 | float
|
---|
236 | VssRay::GetDirParametrization(const int axis) const
|
---|
237 | {
|
---|
238 | Vector3 dir = GetNormalizedDir();
|
---|
239 | return GetDirParam(axis, dir);
|
---|
240 | }
|
---|
241 |
|
---|
242 | float
|
---|
243 | VssRay::GetOpositeDirParametrization(const int axis) const
|
---|
244 | {
|
---|
245 | Vector3 dir = -GetNormalizedDir();
|
---|
246 | return GetDirParam(axis, dir);
|
---|
247 | }
|
---|
248 |
|
---|
249 |
|
---|
250 | void
|
---|
251 | GenerateExtendedConvexCombinationWeights2(float &w1,
|
---|
252 | float &w2,
|
---|
253 | const float overlap
|
---|
254 | )
|
---|
255 | {
|
---|
256 | w1 = RandomValue(-overlap, 1.0f + overlap);
|
---|
257 | w2 = 1.0f - w1;
|
---|
258 | }
|
---|
259 |
|
---|
260 | void
|
---|
261 | GenerateExtendedConvexCombinationWeights(float &w1,
|
---|
262 | float &w2,
|
---|
263 | float &w3,
|
---|
264 | const float overlap
|
---|
265 | )
|
---|
266 | {
|
---|
267 |
|
---|
268 | while (1) {
|
---|
269 | w1 = RandomValue(-overlap, 1.0f + overlap);
|
---|
270 | w2 = RandomValue(-overlap, 1.0f + overlap);
|
---|
271 | w3 = 1.0f + overlap - w1 - w2;
|
---|
272 | if (w3 >= -overlap && w3 <= 1.0f + overlap)
|
---|
273 | break;
|
---|
274 | /*
|
---|
275 | w3 = RandomValue(0.0f, 1.0f + overlap);
|
---|
276 |
|
---|
277 | float sum = w1 + w2 + w3;
|
---|
278 | if (sum>0.0f) {
|
---|
279 | w1/=sum;
|
---|
280 | w2/=sum;
|
---|
281 | w3/=sum;
|
---|
282 | break;
|
---|
283 | }
|
---|
284 | */
|
---|
285 | }
|
---|
286 | }
|
---|
287 |
|
---|
288 |
|
---|
289 | void
|
---|
290 | VssRayContainer::PrintStatistics(ostream &s)
|
---|
291 | {
|
---|
292 |
|
---|
293 | VssRayContainer::const_iterator it = begin(), it_end = end();
|
---|
294 | int sumContributions = 0;
|
---|
295 | float sumRelContributions = 0.0f;
|
---|
296 |
|
---|
297 | for (; it != it_end; ++it) {
|
---|
298 | VssRay *ray = *it;
|
---|
299 | sumContributions += ray->mPvsContribution;
|
---|
300 | sumRelContributions += ray->mRelativePvsContribution;
|
---|
301 | }
|
---|
302 |
|
---|
303 | s<<"##### VSS RAY STAT ##########\n";
|
---|
304 | s<<"#RAYS\n"<<(int)size()<<endl;
|
---|
305 | s<<"#AVG_RAY_PVS_CONTRIBUTION\n"<<sumContributions/(float)size()<<endl;
|
---|
306 | s<<"#AVG_RAY_RELATIVE_PVS_CONTRIBUTION\n"<<sumRelContributions/
|
---|
307 | (float)size()<<endl;
|
---|
308 |
|
---|
309 | }
|
---|
310 |
|
---|
311 |
|
---|
312 | int
|
---|
313 | VssRayContainer::SelectRays(const int number,
|
---|
314 | VssRayContainer &selected,
|
---|
315 | const bool copy) const
|
---|
316 | {
|
---|
317 | float p = number/(float)size();
|
---|
318 | VssRayContainer::const_iterator it = begin();
|
---|
319 |
|
---|
320 | for (; it != end(); it++)
|
---|
321 | if (Random(1.0f) < p) {
|
---|
322 | if (!copy)
|
---|
323 | selected.push_back(*it);
|
---|
324 | else
|
---|
325 | selected.push_back(new VssRay(**it));
|
---|
326 | }
|
---|
327 |
|
---|
328 | return (int)selected.size();
|
---|
329 | }
|
---|
330 |
|
---|
331 |
|
---|
332 | int
|
---|
333 | VssRayContainer::GetContributingRays(VssRayContainer &selected,
|
---|
334 | const int minPass
|
---|
335 | ) const
|
---|
336 | {
|
---|
337 | VssRayContainer::const_iterator it = begin();
|
---|
338 | // ofstream s("contrib.log");
|
---|
339 | for (; it != end(); it++) {
|
---|
340 | VssRay *ray = *it;
|
---|
341 | // s<<"(pass="<<ray->mPass<<", c="<<ray->mPvsContribution<<")"<<endl;
|
---|
342 | if (ray->mPass >= minPass && ray->mPvsContribution > 0)
|
---|
343 | selected.push_back(ray);
|
---|
344 | }
|
---|
345 | return (int)selected.size();
|
---|
346 | }
|
---|
347 |
|
---|
348 |
|
---|
349 |
|
---|
350 | }
|
---|