CubbyFlow/Examples/SmokeSim/main.cpp at main · utilForever/CubbyFlow · GitHub

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// This code is based on Jet framework.

// CubbyFlow is voxel-based fluid simulation engine for computer games.

// Core Part: Chris Ohk, Junwoo Hwang, Jihong Sin, Seungwoo Yoo

// AI Part: Dongheon Cho, Minseo Kim

// We are making my contributions/submissions to this project solely in our

// personal capacity and are not conveying any rights to any intellectual

// property of any third parties.

#include <../ClaraUtils.hpp>

#include <Core/Array/Array.hpp>

#include <Core/Emitter/VolumeGridEmitter3.hpp>

#include <Core/Geometry/Box.hpp>

#include <Core/Geometry/ImplicitTriangleMesh3.hpp>

#include <Core/Geometry/RigidBodyCollider.hpp>

#include <Core/Geometry/Sphere.hpp>

#include <Core/Geometry/TriangleMesh3.hpp>

#include <Core/Grid/ScalarGrid.hpp>

#include <Core/Math/MathUtils.hpp>

#include <Core/Solver/Advection/CubicSemiLagrangian3.hpp>

#include <Core/Solver/Advection/SemiLagrangian3.hpp>

#include <Core/Solver/Grid/GridSmokeSolver3.hpp>

#include <Core/Utils/Logging.hpp>

#include <pystring/pystring.h>

#include <clara.hpp>

#ifdef CUBBYFLOW_WINDOWS

#include <direct.h>

#else

#include <sys/stat.h>

#endif

#include <array>

#include <cstring>

#include <fstream>

#include <iostream>

#include <string>

#include <vector>

#define APP_NAME "SmokeSim"

using namespace CubbyFlow;

const size_t EDGE_BLUR = 3;

const float EDGE_BLUR_F = 3.f;

const double TGA_SCALE = 10.0;

inline float SmoothStep(float edge0, float edge1, float x)

{

const float t = Clamp((x - edge0) / (edge1 - edge0), 0.f, 1.f);

return t * t * (3.f - 2.f * t);

}

// Export density field to Mitsuba volume file.

void SaveVolumeAsVol(const ScalarGrid3Ptr& density, const std::string& rootDir,

int frameCnt)

{

char baseName[256];

snprintf(baseName, sizeof(baseName), "frame_%06d.vol", frameCnt);

std::string fileName = pystring::os::path::join(rootDir, baseName);

std::ofstream file(fileName.c_str(), std::ofstream::binary);

if (file)

{

printf("Writing %s...\n", fileName.c_str());

// Mitsuba 0.5.0 grid-volume format

char header[48];

memset(header, 0, sizeof(header));

header[0] = 'V';

header[1] = 'O';

header[2] = 'L';

header[3] = 3;

const std::array<int32_t, 5> encoding = {

1, // 32-bit float

static_cast<int32_t>(density->DataSize().x),

static_cast<int32_t>(density->DataSize().y),

static_cast<int32_t>(density->DataSize().z),

1 // number of channels

};

std::memcpy(header + 4, encoding.data(), sizeof(encoding));

const BoundingBox3D domain = density->GetBoundingBox();

const std::array<float, 6> bbox = {

static_cast<float>(domain.lowerCorner.x),

static_cast<float>(domain.lowerCorner.y),

static_cast<float>(domain.lowerCorner.z),

static_cast<float>(domain.upperCorner.x),

static_cast<float>(domain.upperCorner.y),

static_cast<float>(domain.upperCorner.z)

};

std::memcpy(header + 4 + sizeof(encoding), bbox.data(), sizeof(bbox));

file.write(header, sizeof(header));

Array3<float> data(density->DataSize());

ParallelForEachIndex(data.Size(), [&](size_t i, size_t j, size_t k) {

float d = static_cast<float>((*density)(i, j, k));

// Blur the edge for less-noisy rendering

if (i < EDGE_BLUR)

{

d *= SmoothStep(0.f, EDGE_BLUR_F, static_cast<float>(i));

}

if (i > data.Size().x - 1 - EDGE_BLUR)

{

d *= SmoothStep(0.f, EDGE_BLUR_F,

static_cast<float>((data.Size().x - 1) - i));

}

if (j < EDGE_BLUR)

{

d *= SmoothStep(0.f, EDGE_BLUR_F, static_cast<float>(j));

}

if (j > data.Size().y - 1 - EDGE_BLUR)

{

d *= SmoothStep(0.f, EDGE_BLUR_F,

static_cast<float>((data.Size().y - 1) - j));

}

if (k < EDGE_BLUR)

{

d *= SmoothStep(0.f, EDGE_BLUR_F, static_cast<float>(k));

}

if (k > data.Size().z - 1 - EDGE_BLUR)

{

d *= SmoothStep(0.f, EDGE_BLUR_F,

static_cast<float>((data.Size().z - 1) - k));

}

data(i, j, k) = d;

});

file.write(

reinterpret_cast<const char*>(data.data()),

sizeof(float) * data.Size().x * data.Size().y * data.Size().z);

file.close();

}

void SaveVolumeAsTga(const ScalarGrid3Ptr& density, const std::string& rootDir,

int frameCnt)

{

char baseName[256];

snprintf(baseName, sizeof(baseName), "frame_%06d.tga", frameCnt);

std::string fileName = pystring::os::path::join(rootDir, baseName);

std::ofstream file(fileName.c_str(), std::ofstream::binary);

if (file)

{

printf("Writing %s...\n", fileName.c_str());

Vector3UZ dataSize = density->DataSize();

std::array<char, 18> header;

header.fill(0);

const int imgWidth = static_cast<int>(dataSize.x);

const int imgHeight = static_cast<int>(dataSize.y);

header[2] = 2;

header[12] = static_cast<char>(imgWidth & 0xff);

header[13] = static_cast<char>((imgWidth & 0xff00) >> 8);

header[14] = static_cast<char>(imgHeight & 0xff);

header[15] = static_cast<char>((imgHeight & 0xff00) >> 8);

header[16] = 24;

file.write(header.data(), header.size());

Array2<double> hdrImg(dataSize.x, dataSize.y);

ParallelForEachIndex(hdrImg.Size(), [&](size_t i, size_t j) {

double sum = 0.0;

for (size_t k = 0; k < dataSize.z; ++k)

{

sum += (*density)(i, j, k);

}

hdrImg(i, j) = TGA_SCALE * sum / static_cast<double>(dataSize.z);

});

std::vector<char> img(3 * dataSize.x * dataSize.y);

for (size_t i = 0; i < dataSize.x * dataSize.y; ++i)

{

const char val =

static_cast<char>(Clamp(hdrImg[i], 0.0, 1.0) * 255.0);

img[3 * i + 0] = val;

img[3 * i + 1] = val;

img[3 * i + 2] = val;

}

file.write(img.data(), img.size());

file.close();

}

void PrintInfo(const GridSmokeSolver3Ptr& solver)

{

const auto grids = solver->GetGridSystemData();

const Vector3UZ resolution = grids->Resolution();

const BoundingBox3D domain = grids->GetBoundingBox();

const Vector3D gridSpacing = grids->GridSpacing();

printf("Resolution: %zu x %zu x %zu\n", resolution.x, resolution.y,

resolution.z);

printf("Domain: [%f, %f, %f] x [%f, %f, %f]\n", domain.lowerCorner.x,

domain.lowerCorner.y, domain.lowerCorner.z, domain.upperCorner.x,

domain.upperCorner.y, domain.upperCorner.z);

printf("Grid spacing: [%f, %f, %f]\n", gridSpacing.x, gridSpacing.y,

gridSpacing.z);

}

void RunSimulation(const std::string& rootDir,

const GridSmokeSolver3Ptr& solver, int numberOfFrames,

const std::string& format, double fps)

{

const auto density = solver->GetSmokeDensity();

for (Frame frame(0, 1.0 / fps); frame.index < numberOfFrames; ++frame)

{

solver->Update(frame);

if (format == "vol")

{

SaveVolumeAsVol(density, rootDir, frame.index);

}

else if (format == "tga")

{

SaveVolumeAsTga(density, rootDir, frame.index);

}

void RunExample1(const std::string& rootDir, size_t resolutionX,

int numberOfFrames, const std::string& format, double fps)

{

// Build solver

auto solver =

GridSmokeSolver3::Builder()

.WithResolution({ resolutionX, 2 * resolutionX, resolutionX })

.WithDomainSizeX(1.0)

.MakeShared();

solver->SetAdvectionSolver(std::make_shared<CubicSemiLagrangian3>());

const auto grids = solver->GetGridSystemData();

BoundingBox3D domain = grids->GetBoundingBox();

// Build emitter

const auto box = Box3::Builder()

.WithLowerCorner({ 0.45, -1, 0.45 })

.WithUpperCorner({ 0.55, 0.05, 0.55 })

.MakeShared();

auto emitter = VolumeGridEmitter3::Builder()

.WithSourceRegion(box)

.WithIsOneShot(false)

.MakeShared();

solver->SetEmitter(emitter);

emitter->AddStepFunctionTarget(solver->GetSmokeDensity(), 0, 1);

emitter->AddStepFunctionTarget(solver->GetTemperature(), 0, 1);

// Build collider

const auto sphere = Sphere3::Builder()

.WithCenter({ 0.5, 0.3, 0.5 })

.WithRadius(0.075 * domain.Width())

.MakeShared();

const auto collider =

RigidBodyCollider3::Builder().WithSurface(sphere).MakeShared();

solver->SetCollider(collider);

// Print simulation info

printf("Running example 1 (rising smoke with cubic-spline advection)\n");

PrintInfo(solver);

// Run simulation

RunSimulation(rootDir, solver, numberOfFrames, format, fps);

}

void RunExample2(const std::string& rootDir, size_t resolutionX,

int numberOfFrames, const std::string& format, double fps)

{

// Build solver

auto solver =

GridSmokeSolver3::Builder()

.WithResolution({ resolutionX, 2 * resolutionX, resolutionX })

.WithDomainSizeX(1.0)

.MakeShared();

solver->SetAdvectionSolver(std::make_shared<SemiLagrangian3>());

const auto grids = solver->GetGridSystemData();

BoundingBox3D domain = grids->GetBoundingBox();

// Build emitter

const auto box = Box3::Builder()

.WithLowerCorner({ 0.45, -1, 0.45 })

.WithUpperCorner({ 0.55, 0.05, 0.55 })

.MakeShared();

auto emitter = VolumeGridEmitter3::Builder()

.WithSourceRegion(box)

.WithIsOneShot(false)

.MakeShared();

solver->SetEmitter(emitter);

emitter->AddStepFunctionTarget(solver->GetSmokeDensity(), 0, 1);

emitter->AddStepFunctionTarget(solver->GetTemperature(), 0, 1);

// Build collider

const auto sphere = Sphere3::Builder()

.WithCenter({ 0.5, 0.3, 0.5 })

.WithRadius(0.075 * domain.Width())

.MakeShared();

const auto collider =

RigidBodyCollider3::Builder().WithSurface(sphere).MakeShared();

solver->SetCollider(collider);

// Print simulation info

printf("Running example 2 (rising smoke with linear advection)\n");

PrintInfo(solver);

// Run simulation

RunSimulation(rootDir, solver, numberOfFrames, format, fps);

}

void RunExample3(const std::string& rootDir, size_t resolutionX,

int numberOfFrames, const std::string& format, double fps)

{

// Build solver

auto solver = GridSmokeSolver3::Builder()

.WithResolution(

{ resolutionX, resolutionX / 4 * 5, resolutionX / 2 })

.WithDomainSizeX(2.0)

.WithOrigin({ -1, -0.15, -0.5 })

.MakeShared();

// Build emitter

auto dragonMesh = TriangleMesh3::Builder().MakeShared();

std::ifstream objFile(RESOURCES_DIR "/dragon.obj");

if (objFile)

{

[[maybe_unused]] bool isLoaded = dragonMesh->ReadObj(&objFile);

}

else

{

fprintf(stderr, "Cannot open Resources/dragon.obj\n");

exit(EXIT_FAILURE);

}

const auto dragon = ImplicitTriangleMesh3::Builder()

.WithTriangleMesh(dragonMesh)

.WithResolutionX(resolutionX)

.MakeShared();

auto emitter = VolumeGridEmitter3::Builder()

.WithSourceRegion(dragon)

.WithIsOneShot(false)

.MakeShared();

solver->SetEmitter(emitter);

emitter->AddStepFunctionTarget(solver->GetSmokeDensity(), 0, 1);

emitter->AddStepFunctionTarget(solver->GetTemperature(), 0, 1);

// Print simulation info

printf("Running example 3 (rising dragon)\n");

PrintInfo(solver);

// Run simulation

RunSimulation(rootDir, solver, numberOfFrames, format, fps);

}

void RunExample4(const std::string& rootDir, size_t resolutionX,

int numberOfFrames, const std::string& format, double fps)

{

// Build solver

auto solver = GridSmokeSolver3::Builder()

.WithResolution(

{ resolutionX, 6 * resolutionX / 5, resolutionX / 2 })

.WithDomainSizeX(1.0)

.MakeShared();

solver->SetBuoyancyTemperatureFactor(2.0);

// Build emitter

const auto box = Box3::Builder()

.WithLowerCorner({ 0.05, 0.1, 0.225 })

.WithUpperCorner({ 0.1, 0.15, 0.275 })

.MakeShared();

auto emitter = VolumeGridEmitter3::Builder()

.WithSourceRegion(box)

.WithIsOneShot(false)

.MakeShared();

solver->SetEmitter(emitter);

emitter->AddStepFunctionTarget(solver->GetSmokeDensity(), 0, 1);

emitter->AddStepFunctionTarget(solver->GetTemperature(), 0, 1);

emitter->AddTarget(solver->GetVelocity(),

[](double sdf, const Vector3D&, const Vector3D& oldVal) {

if (sdf < 0.05)

{

return Vector3D(0.5, oldVal.y, oldVal.z);

}

else

{

return Vector3D(oldVal);

}

});

// Print simulation info

printf("Running example 4 (rising smoke with cubic-spline advection)\n");

PrintInfo(solver);

// Run simulation

RunSimulation(rootDir, solver, numberOfFrames, format, fps);

}

void RunExample5(const std::string& rootDir, size_t resolutionX,

int numberOfFrames, const std::string& format, double fps)

{

// Build solver

auto solver = GridSmokeSolver3::Builder()

.WithResolution(

{ resolutionX, 6 * resolutionX / 5, resolutionX / 2 })

.WithDomainSizeX(1.0)

.MakeShared();

solver->SetBuoyancyTemperatureFactor(2.0);

solver->SetAdvectionSolver(std::make_shared<SemiLagrangian3>());

// Build emitter

const auto box = Box3::Builder()

.WithLowerCorner({ 0.05, 0.1, 0.225 })

.WithUpperCorner({ 0.1, 0.15, 0.275 })

.MakeShared();

auto emitter = VolumeGridEmitter3::Builder()

.WithSourceRegion(box)

.WithIsOneShot(false)

.MakeShared();

solver->SetEmitter(emitter);

emitter->AddStepFunctionTarget(solver->GetSmokeDensity(), 0, 1);

emitter->AddStepFunctionTarget(solver->GetTemperature(), 0, 1);

emitter->AddTarget(solver->GetVelocity(), [](double sdf, const Vector3D& pt,

const Vector3D& oldVal) {

UNUSED_VARIABLE(pt);

if (sdf < 0.05)

{

return Vector3D(0.5, oldVal.y, oldVal.z);

}

else

{

return Vector3D(oldVal);

}

});

// Print simulation info

printf("Running example 5 (rising smoke with linear advection)\n");

PrintInfo(solver);

// Run simulation

RunSimulation(rootDir, solver, numberOfFrames, format, fps);

}

int main(int argc, char* argv[])

{

bool showHelp = false;

size_t resX = 50;

int numberOfFrames = 100;

double fps = 60.0;

int exampleNum = 1;

std::string logFileName = APP_NAME ".log";

std::string outputDir = APP_NAME "_output";

std::string format = "tga";

// Parsing

auto parser =

clara::Help(showHelp) |

clara::Opt(resX, "resX")["-r"]["--resx"](

"grid resolution in x-axis (default is 50)") |

clara::Opt(numberOfFrames, "numberOfFrames")["-f"]["--frames"](

"total number of frames (default is 100)") |

clara::Opt(

fps, "fps")["-p"]["--fps"]("frames per second (default is 60.0)") |

clara::Opt(exampleNum, "exampleNum")["-e"]["--example"](

"example number (between 1 and 5, default is 1)") |

clara::Opt(logFileName, "logFileName")["-l"]["--log"](

"log file name (default is " APP_NAME ".log)") |

clara::Opt(outputDir, "outputDir")["-o"]["--output"](

"output directory name (default is " APP_NAME "_output)") |

clara::Opt(format, "format")["-m"]["--format"](

"particle output format (tag or vol. default is tag)");

auto result = parser.parse(clara::Args(argc, argv));

if (!result)

{

std::cerr << "Error in command line: " << result.errorMessage() << '\n';

exit(EXIT_FAILURE);

}

if (showHelp)

{

std::cout << ToString(parser) << '\n';

exit(EXIT_SUCCESS);

}

#ifdef CUBBYFLOW_WINDOWS

_mkdir(outputDir.c_str());

#else

mkdir(outputDir.c_str(), S_IRWXU | S_IRWXG | S_IRWXO);

#endif

std::ofstream logFile(logFileName.c_str());

if (logFile)

{

Logging::SetAllStream(&logFile);

}

switch (exampleNum)

{

case 1:

RunExample1(outputDir, resX, numberOfFrames, format, fps);

break;

case 2:

RunExample2(outputDir, resX, numberOfFrames, format, fps);

break;

case 3:

RunExample3(outputDir, resX, numberOfFrames, format, fps);

break;

case 4:

RunExample4(outputDir, resX, numberOfFrames, format, fps);

break;

case 5:

RunExample5(outputDir, resX, numberOfFrames, format, fps);

break;

default:

std::cout << ToString(parser) << '\n';

exit(EXIT_FAILURE);

}

return EXIT_SUCCESS;

}

CubbyFlow/Examples/SmokeSim/main.cpp at main · utilForever/CubbyFlow · GitHub

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