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
|
#pragma once
#include <forstio/codec/data.hpp>
namespace kel {
namespace lbm {
namespace sch {
using namespace saw::schema;
template<typename T, uint64_t D>
using ParticleRigidBody = Struct<
Member<FixedArray<T,D>, "position">,
Member<FixedArray<T,D>, "position_old">,
Member<FixedArray<T,D>, "rotation">,
Member<FixedArray<T,D>, "rotation_old">,
Member<FixedArray<T,D>, "acceleration">,
Member<FixedArray<T,D>, "rotational_acceleration">
>;
template<typename T, uint64_t D>
using ParticleMask = Struct<
Member<Array<T,D>, "grid">
>;
template<typename T, uint64_t D>
using Particle = Struct<
Member<ParticleRigidBody<T,D>, "rigid_body">,
Member<ParticleMask<Float32,D>, "mask">
>;
}
template<typename T, uint64_t D, typename Particle>
class particle_system {
private:
saw::data<sch::Array<Particle, D>> particles_;
void verlet_step(saw::data<sch::Particle<T,D>>& particle, saw::data<T> time_step_delta){
auto& body = particle.template get<"rigid_body">();
auto& pos = body.template get<"position">();
auto& pos_old = body.template get<"position_old">();
auto& rot = body.template get<"rotation">();
auto& acc = body.template get<"acceleration">();
auto tsd_squared = time_step_delta * time_step_delta;
saw::data<sch::FixedArray<T,D>> pos_new;
// Actual step
for(uint64_t i = 0u; i < D; ++i){
pos_new.at({i}) = saw::data<T>{2.0} * pos.at({i}) - pos_old.at({i}) + acc.at({i}) * tsd_squared;
}
pos_old = pos;
pos = pos_new;
}
public:
void step(T time_step_delta){
for(auto& iter : particles_){
verlet_step(time_step_delta);
}
}
template<typename LbmLattice>
void update_particle_border(saw::data<LbmLattice>& latt){
for(auto& iter : particles_){
}
}
};
}
}
|
