-
Notifications
You must be signed in to change notification settings - Fork 3
/
ParticleDomain.cpp
538 lines (378 loc) · 17.9 KB
/
ParticleDomain.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
#ifndef ParticleDomain_impl_
#define ParticleDomain_impl_
#include "ParticleDomain.h"
namespace sph{
template<typename T_dat>
ParticleDomain<T_dat>::ParticleDomain()
:
_isGridVisible(false),
_boxSize(T_Vec3()),
_gravityVector(0., GRAVITY_ACCELERATION, 0.),
_grid(nullptr),
_particles(nullptr)
{
_walls = new T_WallVector(5, T_Wall()) ;
loadScenario(INITIAL_SCENARIO);
}
template<typename T_dat>
void ParticleDomain<T_dat>::loadScenario(int newScenario){
_scenario = newScenario;
this->clear();
T_Particle::_count = 0 ;
switch( _scenario ){
case SCENARIO_DAM:{
_boxSize.x = BOX_SIDE * 2. ;
_boxSize.y = BOX_SIDE ;
_boxSize.z = BOX_SIDE / 2. ;
int gridXCellMax = ceil(_boxSize.x/DIAMETER);
int gridYCellMax = ceil(_boxSize.y/DIAMETER);
int gridZCellMax = ceil(_boxSize.z/DIAMETER);
_grid = new ParticleGrid<T_dat>(gridXCellMax, gridYCellMax, gridZCellMax);
addWalls(_boxSize, _walls);
T_ParticleVector& firstGridCell = (*_grid)(0,0,0);
for (double x = -_boxSize.x/2.0; x < -_boxSize.x/4.0; x += DIAMETER/2.0) {
for (double y = -_boxSize.y/2.0; y < _boxSize.y/2.0; y+= DIAMETER/2.0) {
for (double z = -_boxSize.z/2.0; z < _boxSize.z/2.0; z+= DIAMETER/2.0) {
firstGridCell.push_back(T_Particle(T_Vec3(x,y,z)));
}
}
}
break;
}
case SCENARIO_CUBE:{
_boxSize.x = BOX_SIDE;
_boxSize.y = BOX_SIDE;
_boxSize.z = BOX_SIDE;
int gridXCellMax = ceil(_boxSize.x/DIAMETER);
int gridYCellMax = ceil(_boxSize.y/DIAMETER);
int gridZCellMax = ceil(_boxSize.z/DIAMETER);
_grid = new ParticleGrid<T_dat>(gridXCellMax, gridYCellMax, gridZCellMax);
addWalls(_boxSize, _walls);
T_ParticleVector& firstGridCell = (*_grid)(0,0,0);
for (T_dat x = -_boxSize.x/5.0; x < _boxSize.x/5.0; x += DIAMETER/2.0) {
for (T_dat y = 0. ; y < _boxSize.y/2.0; y+= DIAMETER/2.0) {
for (T_dat z = -_boxSize.z/2.0; z < _boxSize.z/2.0; z+= DIAMETER/2.0) {
firstGridCell.push_back(T_Particle(T_Vec3(x,y,z)));
}
}
}
break;
}
case SCENARIO_FAUCET:{
_boxSize.x = BOX_SIDE;
_boxSize.y = BOX_SIDE;
_boxSize.z = BOX_SIDE;
int gridXCellMax = ceil(_boxSize.x/DIAMETER);
int gridYCellMax = ceil(_boxSize.y/DIAMETER);
int gridZCellMax = ceil(_boxSize.z/DIAMETER);
_grid = new ParticleGrid<T_dat>(gridXCellMax, gridYCellMax, gridZCellMax);
addWalls(_boxSize, _walls);
break;
}
default:{
printf("case/scenario is not available!\n");
}
}
}
template<typename T_dat>
void ParticleDomain<T_dat>::addWalls(T_Vec3 const& boxSize_, T_WallVector* wall_){
(*wall_)[0] = T_Wall(T_Vec3(0,0, 1), T_Vec3(0,0,-boxSize_.z/2.) ) ; // back
(*wall_)[1] = T_Wall(T_Vec3(0,0,-1), T_Vec3(0,0, boxSize_.z/2.) ) ; // front
(*wall_)[2] = T_Wall(T_Vec3( 1,0,0), T_Vec3(-boxSize_.x/2.,0,0) ) ; // left
(*wall_)[3] = T_Wall(T_Vec3(-1,0,0), T_Vec3( boxSize_.x/2.,0,0) ) ; // right
(*wall_)[4] = T_Wall(T_Vec3(0, 1,0), T_Vec3(0,-boxSize_.y/2.,0) ) ; // bottom
}
template<typename T_dat>
void ParticleDomain<T_dat>::addParticle(const T_Vec3& position, const T_Vec3& velocity) {
(*_grid)(0,0,0).push_back(T_Particle(position, velocity));
}
template<typename T_dat>
void ParticleDomain<T_dat>::addParticle(const T_Vec3& position) {
addParticle(position, T_Vec3());
}
template<typename T_dat>
ParticleDomain<T_dat>::~ParticleDomain()
{
this->clear();
}
template<typename T_dat>
void ParticleDomain<T_dat>::clear(){
if (_grid) {delete _grid;}
if (_particles){delete _particles;}
}
template<typename T_dat>
void ParticleDomain<T_dat>::switchGridVisble() {
_isGridVisible = !_isGridVisible;
}
// After the calculation of the new particle positions,
// update the new grid of particles.
template<typename T_dat>
void ParticleDomain<T_dat>::updateGrid() {
for (int referX = 0 ; referX < _grid->xCellMax() ; referX++ ) {
for (int referY = 0 ; referY < _grid->yCellMax() ; referY++ ) {
for (int referZ = 0 ; referZ < _grid->zCellMax() ; referZ++ ) {
T_ParticleVector& reference_particles = (*_grid)(referX,referY,referZ);
for (auto it = reference_particles.begin(); it != reference_particles.end(); it++ ){
int currentGridCellX = (int)floor( (it->position().x + _boxSize.x/2.) / DIAMETER );
int currentGridCellY = (int)floor( (it->position().y + _boxSize.y/2.) / DIAMETER );
int currentGridCellZ = (int)floor( (it->position().z + _boxSize.z/2.) / DIAMETER );
if ( currentGridCellX < 0 ){
currentGridCellX = 0 ;
}else if ( currentGridCellX >= _grid->xCellMax() ){
currentGridCellX = _grid->xCellMax() - 1 ;
}
if ( currentGridCellY < 0 ){
currentGridCellY = 0 ;
}else if ( currentGridCellY >= _grid->yCellMax() ){
currentGridCellY = _grid->yCellMax() - 1 ;
}
if ( currentGridCellZ < 0 ){
currentGridCellZ = 0 ;
}else if ( currentGridCellZ >= _grid->zCellMax() ){
currentGridCellZ = _grid->zCellMax() - 1 ;
}
if( currentGridCellX != referX || currentGridCellY != referY || currentGridCellZ != referZ ){
(*_grid)(currentGridCellX, currentGridCellY, currentGridCellZ).push_back(*it);
reference_particles.erase(it--);
}
}
}
}
}
}
template<typename T_dat>
void ParticleDomain<T_dat>::draw() {
static float shininess = 10.0f;
glEnable(GL_LIGHTING);
glMaterialfv(GL_FRONT, GL_DIFFUSE, blue);
glMaterialfv(GL_FRONT, GL_SPECULAR, white);
glMaterialfv(GL_FRONT, GL_SHININESS, &shininess);
auto particles_in_all_cells = _grid->allParticles( ) ;
for (auto particles_in_one_cell = particles_in_all_cells->begin() ;
particles_in_one_cell != particles_in_all_cells->end() ;
particles_in_one_cell++
) {
for( auto particle = particles_in_one_cell->begin(); particle != particles_in_one_cell->end(); particle++){
particle->draw();
}
}
glDisable(GL_LIGHTING);
if ( _isGridVisible ) {
glColor3fv(green);
for (int referX = 0 ; referX < _grid->xCellMax() ; referX++ ) {
for (int referY = 0 ; referY < _grid->yCellMax() ; referY++ ) {
for (int referZ = 0 ; referZ < _grid->zCellMax() ; referZ++ ) {
glPushMatrix();
glTranslated(referX*DIAMETER - _boxSize.x/2.0 + DIAMETER/2.0,
referY*DIAMETER - _boxSize.y/2.0 + DIAMETER/2.0,
referZ*DIAMETER - _boxSize.z/2.0 + DIAMETER/2.0);
glutWireCube(DIAMETER);
glPopMatrix();
}
}
}
}
glColor3fv(black);
glPopMatrix();
glScaled(_boxSize.x, _boxSize.y, _boxSize.z);
glutWireCube(1.);
glPopMatrix();
return;
}
template<typename T_dat>
void ParticleDomain<T_dat>::stepVerlet(T_dat dt){
this->calculateAcceleration();
auto particles_in_all_cells = _grid->allParticles( ) ;
for (auto particles_in_one_cell = particles_in_all_cells->begin() ;
particles_in_one_cell != particles_in_all_cells->end() ;
particles_in_one_cell++
) {
for( auto particle = particles_in_one_cell->begin(); particle != particles_in_one_cell->end(); particle++){
auto currentPosition = particle->position() + particle->velocity()*dt + particle->acceleration()*dt*dt;
auto currentVelocity = ( currentPosition - particle->position()) / dt;
particle->position() = currentPosition ;
particle->velocity() = currentVelocity ;
}
}
if (_scenario == SCENARIO_FAUCET && T_Particle::_count < MAX_PARTICLES ){
this->addFacucetParticle();
}
this->updateGrid();
}
template<typename T_dat>
void ParticleDomain<T_dat>::addFacucetParticle(){
static T_Vec3 initialVelocity(-1,-1,0);
addParticle(T_Vec3(BOX_SIDE/2.0-DIAMETER/2.0, BOX_SIDE+DIAMETER* 0.6, 0), initialVelocity);
addParticle(T_Vec3(BOX_SIDE/2.0-DIAMETER/2.0, BOX_SIDE , 0), initialVelocity);
addParticle(T_Vec3(BOX_SIDE/2.0-DIAMETER/2.0, BOX_SIDE+DIAMETER*-0.6, 0), initialVelocity);
addParticle(T_Vec3(BOX_SIDE/2.0-DIAMETER/2.0, BOX_SIDE+DIAMETER*0.3, DIAMETER* 0.6), initialVelocity);
addParticle(T_Vec3(BOX_SIDE/2.0-DIAMETER/2.0, BOX_SIDE+DIAMETER*0.3, DIAMETER*-0.6), initialVelocity);
addParticle(T_Vec3(BOX_SIDE/2.0-DIAMETER/2.0, BOX_SIDE+DIAMETER*-0.3, DIAMETER* 0.6), initialVelocity);
addParticle(T_Vec3(BOX_SIDE/2.0-DIAMETER/2.0, BOX_SIDE+DIAMETER*-0.3, DIAMETER*-0.6), initialVelocity);
}
// *************************************************************
// Go over 27 neighbor cells to update acceleration, etc.
// *************************************************************
template<typename T_dat>
void ParticleDomain<T_dat>::calculateAcceleration(){
// ********************************************
// Step 1. Update Density and Pressure
// ********************************************
// Iterate over cells
for (int referX = 0 ; referX < _grid->xCellMax() ; referX++ ) {
for (int referY = 0 ; referY < _grid->yCellMax() ; referY++ ) {
for (int referZ = 0 ; referZ < _grid->zCellMax() ; referZ++ ) {
T_ParticleVector& reference_particles = (*_grid)(referX,referY,referZ);
for (auto it = reference_particles.begin(); it != reference_particles.end(); it++ ){
T_Particle& particle = *it ;
particle.density() = 0. ;
// Iterate over neighbor cells
for (int offsetX = -1; offsetX <= 1; offsetX++) {
if (referX+offsetX < 0) {continue;}
else if (referX+offsetX >= _grid->xCellMax()) {break;}
else{
for (int offsetY = -1; offsetY <= 1; offsetY++) {
if (referY+offsetY < 0) {continue;}
else if (referY+offsetY >= _grid->yCellMax()) {break;}
else{
for (int offsetZ = -1; offsetZ <= 1; offsetZ++) {
if (referZ+offsetZ < 0) {continue;}
else if (referZ+offsetZ >= _grid->zCellMax()) {break;}
else{
T_ParticleVector& neighborParticles = (*_grid)(referX+offsetX, referY+offsetY, referZ+offsetZ);
for ( auto neighbor = neighborParticles.begin() ; neighbor != neighborParticles.end() ; neighbor++ ){
auto diffPosition = particle.position() - neighbor->position() ;
double radiusSquared = diffPosition.dot(diffPosition);
if ( radiusSquared <= DIAMETER * DIAMETER){
particle.density() += Wpoly6( radiusSquared );
}
}
}
}
}
}
}
} // end step 1 iterate over neighbors.
particle.density() *= PARTICLE_MASS ;
particle.pressure() = GAS_STIFFNESS * ( particle.density() - REST_DENSITY );
}
}
}
} // End Step 1 Iterate over cells
// ********************************************
// Step 2. Update Forces
// ********************************************
// Iterate over cells
for (int referX = 0 ; referX < _grid->xCellMax() ; referX++ ) {
for (int referY = 0 ; referY < _grid->yCellMax() ; referY++ ) {
for (int referZ = 0 ; referZ < _grid->zCellMax() ; referZ++ ) {
T_ParticleVector& reference_particles = (*_grid)(referX,referY,referZ) ;
for (auto it = reference_particles.begin(); it != reference_particles.end(); it++ ){
T_Particle& particle = *it ;
T_Vec3 f_pressure,
f_viscosity,
f_surface,
f_gravity = _gravityVector * particle.density(),
colorFieldNormal ;
double colorFieldLaplacian = 0. ;
// Iterate over neighbor cells
for (int offsetX = -1; offsetX <= 1; offsetX++) {
if (referX+offsetX < 0) {continue;}
else if (referX+offsetX >= _grid->xCellMax()) {break;}
else{
for (int offsetY = -1; offsetY <= 1; offsetY++) {
if (referY+offsetY < 0) {continue;}
else if (referY+offsetY >= _grid->yCellMax()) {break;}
else{
for (int offsetZ = -1; offsetZ <= 1; offsetZ++) {
if (referZ+offsetZ < 0) {continue;}
else if (referZ+offsetZ >= _grid->zCellMax()) {break;}
else{
T_ParticleVector& neighborParticles = (*_grid)(referX+offsetX, referY+offsetY, referZ+offsetZ);
for ( auto neighbor = neighborParticles.begin() ; neighbor != neighborParticles.end() ; neighbor++ ){
auto diffPosition = particle.position() - neighbor->position() ;
double radiusSquared = diffPosition.dot(diffPosition);
if ( radiusSquared <= DIAMETER*DIAMETER ){
T_Vec3 poly6Gradient, spikyGradient;
Wpoly6Gradient(diffPosition, radiusSquared, poly6Gradient);
WspikyGradient(diffPosition, radiusSquared, spikyGradient);
if (particle.id() != neighbor->id()) {
f_pressure += (particle.pressure()/pow(particle.density(),2)+neighbor->pressure()/pow(neighbor->density(),2))*spikyGradient;
f_viscosity += (neighbor->velocity() - particle.velocity()) * WviscosityLaplacian(radiusSquared) / neighbor->density();
}
colorFieldNormal += poly6Gradient / neighbor->density();
colorFieldLaplacian += Wpoly6Laplacian(radiusSquared) / neighbor->density();
}
}
}
}
}
}
}
} // End step 2 Iterate over neighbor cells
f_pressure *= -PARTICLE_MASS * particle.density();
f_viscosity *= VISCOSITY * PARTICLE_MASS;
colorFieldNormal *= PARTICLE_MASS;
colorFieldLaplacian *= PARTICLE_MASS;
// surface tension force
double colorFieldNormalMagnitude = colorFieldNormal.magnitude();
if (colorFieldNormalMagnitude > SURFACE_THRESHOLD) {
particle.flag() = true;
f_surface = -SURFACE_TENSION * colorFieldNormal / colorFieldNormalMagnitude * colorFieldLaplacian;
}
else {
particle.flag() = false;
}
// force and acceleration
particle.acceleration() = (f_pressure + f_viscosity + f_surface + f_gravity) / particle.density();
T_Vec3 f_collision;
collisionForce(particle, f_collision);
}
}
}
} // End step 2 Iterate over cells
return;
}
template <typename T_dat>
void ParticleDomain<T_dat>::collisionForce(T_Particle& particle, T_Vec3& f_collision){
for (auto it = _walls->begin(); it != _walls->end(); it++ ){
T_Wall& wall = *it ;
double d = ( wall.point() - particle.position()).dot(wall.normal()) + 0.01 ;
if ( d > 0. ){
particle.acceleration() += WALL_K * wall.normal() * d ;
particle.acceleration() += WALL_DAMPING * particle.velocity().dot(wall.normal()) * wall.normal();
}
}
}
template <typename T_dat>
T_dat ParticleDomain<T_dat>::Wpoly6(T_dat radiusSquared) {
static T_dat coefficient = 315.0/(64.0*M_PI*pow(DIAMETER,9));
static T_dat hSquared = DIAMETER*DIAMETER;
return coefficient * pow(hSquared-radiusSquared, 3);
}
template <typename T_dat>
void ParticleDomain<T_dat>::Wpoly6Gradient(T_Vec3& diffPosition, T_dat radiusSquared, T_Vec3& gradient) {
static T_dat coefficient = -945.0/(32.0*M_PI*pow(DIAMETER,9));
static T_dat hSquared = DIAMETER * DIAMETER ;
gradient = coefficient * pow(hSquared-radiusSquared, 2) * diffPosition;
}
template <typename T_dat>
T_dat ParticleDomain<T_dat>::Wpoly6Laplacian(T_dat radiusSquared) {
static T_dat coefficient = -945.0/(32.0*M_PI*pow(DIAMETER,9));
static T_dat hSquared = DIAMETER*DIAMETER;
return coefficient * (hSquared-radiusSquared) * (3.0*hSquared - 7.0*radiusSquared);
}
template <typename T_dat>
void ParticleDomain<T_dat>::WspikyGradient(T_Vec3& diffPosition, T_dat radiusSquared, T_Vec3& gradient) {
static T_dat coefficient = -45.0/(M_PI*pow(DIAMETER,6));
T_dat radius = sqrt(radiusSquared);
gradient = coefficient * pow(DIAMETER-radius, 2) * diffPosition / radius;
}
template <typename T_dat>
T_dat ParticleDomain<T_dat>::WviscosityLaplacian(T_dat radiusSquared) {
static T_dat coefficient = 45.0/(M_PI*pow(DIAMETER,6));
T_dat radius = sqrt(radiusSquared);
return coefficient * (DIAMETER - radius);
}
} // End namespace sph
#endif