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#include "VecGeom/base/Config.h"
#ifndef VECGEOM_ENABLE_CUDA
#include "VecGeom/volumes/LogicalVolume.h"
#include "VecGeomTest/Benchmarker.h"
#include "VecGeom/management/GeoManager.h"
#include "ArgParser.h"
#include "VecGeom/base/Stopwatch.h"
#include <iostream>
#include "VecGeom/volumes/Tessellated.h"
#include "VecGeom/volumes/Box.h"
#include "test/core/TessellatedOrb.h"
#ifdef VECGEOM_EMBREE
#include <embree3/rtcore.h>
#endif
using namespace vecgeom;
#endif
#ifdef VECGEOM_EMBREE
//> An meshed shape which uses the Embree data structures and layout
class EmbreeMeshShape {
public:
EmbreeMeshShape(UnplacedTessellated const &);
void InitMeshFromTesselatedSolid(UnplacedTessellated const &);
virtual double DistanceToIn(double x, double y, double z, double dx, double dy, double dz)
{
RTCRayHit ray;
ray.ray.flags = 0;
ray.ray.org_x = x;
ray.ray.org_y = y;
ray.ray.org_z = z;
ray.ray.dir_x = dx;
ray.ray.dir_y = dy;
ray.ray.dir_z = dz;
ray.ray.tnear = 0.;
ray.ray.tfar = 1E20f;
{
RTCIntersectContext context;
rtcInitIntersectContext(&context);
rtcIntersect1(fScene, &context, &ray);
ray.hit.Ng_x = -ray.hit.Ng_x; // EMBREE_FIXME: only correct for triangles,quads, and subdivision surfaces
ray.hit.Ng_y = -ray.hit.Ng_y;
ray.hit.Ng_z = -ray.hit.Ng_z;
}
return ray.ray.tfar;
}
private:
RTCDevice fDevice = nullptr;
RTCScene fScene = nullptr;
};
EmbreeMeshShape::EmbreeMeshShape(const UnplacedTessellated &tsl)
{
InitMeshFromTesselatedSolid(tsl);
}
void EmbreeMeshShape::InitMeshFromTesselatedSolid(const UnplacedTessellated &tsl)
{
fDevice = rtcNewDevice("VecGeomDevice"); // --> could be a global device??
fScene = rtcNewScene(fDevice);
rtcSetSceneBuildQuality(fScene, RTC_BUILD_QUALITY_HIGH);
unsigned int meshID;
RTCGeometry geom_0 = rtcNewGeometry(fDevice, RTC_GEOMETRY_TYPE_TRIANGLE);
rtcSetGeometryBuildQuality(geom_0, RTC_BUILD_QUALITY_HIGH);
rtcSetGeometryTimeStepCount(geom_0, 1);
meshID = rtcAttachGeometry(fScene, geom_0);
struct Vertex {
float x, y, z, r;
};
struct Triangle {
int v0, v1, v2;
};
// determine number of vertices and triangles
int ntriangles = tsl.GetNFacets();
int nvertices = 3 * ntriangles; // lets assume they are all different so that we don't have to match the vertices
//
/* set vertices and vertex colors */
Vertex *vertices = (Vertex *)rtcSetNewGeometryBuffer(geom_0, RTC_BUFFER_TYPE_VERTEX, 0, RTC_FORMAT_FLOAT3,
4 * sizeof(float), nvertices);
Triangle *triangles = (Triangle *)rtcSetNewGeometryBuffer(geom_0, RTC_BUFFER_TYPE_INDEX, 0, RTC_FORMAT_UINT3,
3 * sizeof(int), ntriangles);
// loop over all tessellated triangles and add them to the embree buffer
int vertexcounter = 0;
for (int t = 0; t < ntriangles; ++t) {
auto tile = tsl.GetFacet(t);
auto v = tile->fVertices;
// tile->fIndices;
vertices[vertexcounter].x = v[0].x();
vertices[vertexcounter].y = v[0].y();
vertices[vertexcounter].z = v[0].z();
triangles[t].v0 = vertexcounter;
vertexcounter++;
vertices[vertexcounter].x = v[1].x();
vertices[vertexcounter].y = v[1].y();
vertices[vertexcounter].z = v[1].z();
triangles[t].v1 = vertexcounter;
vertexcounter++;
vertices[vertexcounter].x = v[2].x();
vertices[vertexcounter].y = v[2].y();
vertices[vertexcounter].z = v[2].z();
triangles[t].v2 = vertexcounter;
vertexcounter++;
}
rtcCommitGeometry(geom_0);
rtcReleaseGeometry(geom_0);
rtcCommitScene(fScene);
}
#endif // VECGEOM_EMBREE
int main(int argc, char *argv[])
{
#ifndef VECGEOM_ENABLE_CUDA
OPTION_INT(npoints, 1024);
OPTION_INT(nrep, 4);
OPTION_DOUBLE(ngrid, 100);
double r = 10. * ngrid;
UnplacedBox worldUnplaced = UnplacedBox(2. * r, 2. * r, 2. * r);
UnplacedTessellated tsl;
// Create the tessellated solid
size_t nfacets = TessellatedOrb(r, ngrid, tsl);
Stopwatch timer;
timer.Start();
tsl.Close();
auto elapsed = timer.Stop();
std::cout << "SETUP TOOK " << elapsed << " s\n";
std::cout << "Benchmarking tessellated sphere having " << nfacets << " facets\n";
LogicalVolume world("world", &worldUnplaced);
LogicalVolume tessellated("tessellated", &tsl);
Transformation3D placement(0, 0, 0);
const VPlacedVolume *placedTsl = world.PlaceDaughter("tessellated", &tessellated, &placement);
(void)placedTsl;
VPlacedVolume *worldPlaced = world.Place();
GeoManager::Instance().SetWorldAndClose(worldPlaced);
// testing tesselated with Embree
// retrieve tessels first of all
assert(nfacets == tsl.GetNFacets());
Benchmarker tester(GeoManager::Instance().GetWorld());
tester.SetVerbosity(1);
tester.SetRepetitions(nrep);
tester.SetPointCount(npoints);
tester.SetToInBias(0.8);
tester.SetPoolMultiplier(1);
tester.RunToInBenchmark();
auto &rays = tester.GetProblematicRays();
std::cerr << "have " << rays.size() << "rays\n";
#ifdef VECGEOM_EMBREE
// this part enables comparison to a pure EMBREE represented tesselated solid
// just to see what is maximally possible if we used floating point precision and no error handling
timer.Start();
EmbreeMeshShape mesh(tsl);
elapsed = timer.Stop();
std::cout << "EMBREE SETUP TOOK " << elapsed << " s\n";
// Stopwatch timer;
timer.Start();
double s = 0;
for (int i = 0; i < rays.size(); ++i) {
const auto &p = rays[i].first;
const auto &d = rays[i].second;
auto dist = mesh.DistanceToIn(p.x(), p.y(), p.z(), d.x(), d.y(), d.z());
// std::cerr << "EMBREE " << dist << "\n";
s += dist;
}
elapsed = timer.Stop();
std::cerr << "time took " << elapsed << " s "
<< " CHECKSUM " << s << "\n";
#endif
// tester.RunToOutBenchmark();
return 0; // tester.RunBenchmark();
#else
return 0;
#endif
}
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