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//
// includes
//
#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>
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using namespace std;
//
// variables
//
float xmin,xmax,ymin,ymax,zmin,zmax,d;
float *ax[3],*ay[3],*az[3],*sx[2],*sy[2];
//
// coordinate functions
//
float xpos(int x,int y,int z) {
float dx;
if (y%2 == 0) {
if (z%3 == 0) dx = 0;
else if (z%3 == 1) dx = 0.5;
else dx = 0;
}
else {
if (z%3 == 0) dx = 0;
else if (z%3 == 1) dx = -0.5;
else dx = 0;
}
return xmin+(x+(y%2)/2.0+dx)*d;
}
float ypos(int y,int z) {
float dy;
if (z%3 == 0) dy = 0;
else if (z%3 == 1) dy = 1/(2*sqrt(3));
else dy = 1/sqrt(3);
return ymin+(sqrt(3.0)*y/2.0+dy)*d;
}
float zpos(int z) {
return zmin+(sqrt(2.0/3.0)*z)*d;
}
//
// main
//
int main(int argc, char** argv) {
if (argc == 1) {
cerr << "command line: STL_particles [arguments] < input.stl | particle sink " << endl;
cerr << " nlattice=(lattice size between x limits)" << endl;
int nlattice;
if (nullptr == strstr(argv[1],"nlattice=")) {
cerr << "STL_particles argument not recognized" << endl;
return 1;
}
else
nlattice = stoi(argv[1]+9);
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//
// read number of triangles
//
int ntriangles;
cin.seekg(80);
cin.read((char*)&ntriangles,4);
cerr << "STL_particles:" << endl;
cerr << " input " << ntriangles << " triangles" << endl;
//
// read triangles
//
ax[0] = new float[ntriangles];
ax[1] = new float[ntriangles];
ax[2] = new float[ntriangles];
ay[0] = new float[ntriangles];
ay[1] = new float[ntriangles];
ay[2] = new float[ntriangles];
az[0] = new float[ntriangles];
az[1] = new float[ntriangles];
az[2] = new float[ntriangles];
sx[0] = new float[ntriangles];
sx[1] = new float[ntriangles];
sy[0] = new float[ntriangles];
sy[1] = new float[ntriangles];
xmin = 1e10; xmax = -1e10;
ymin = 1e10; ymax = -1e10;
zmin = 1e10; zmax = -1e10;
float x0,y0,z0,x1,y1,z1,x2,y2,z2;
float p = 1e-6; // perturbation to remove deneracies
for (int t = 0; t < ntriangles; ++t) {
//
// skip normal
//
cin.seekg(3*4,ios::cur);
//
// read vertices
//
cin.read((char*)&x0,4);
x0 += p;
if (x0 > xmax) xmax = x0;
if (x0 < xmin) xmin = x0;
cin.read((char*)&y0,4);
y0 += p;
if (y0 > ymax) ymax = y0;
if (y0 < ymin) ymin = y0;
cin.read((char*)&z0,4);
z0 += p;
if (z0 > zmax) zmax = z0;
if (z0 < zmin) zmin = z0;
cin.read((char*)&x1,4);
x1 += p;
if (x1 > xmax) xmax = x1;
if (x1 < xmin) xmin = x1;
cin.read((char*)&y1,4);
y1 += p;
if (y1 > ymax) ymax = y1;
if (y1 < ymin) ymin = y1;
cin.read((char*)&z1,4);
z1 += p;
if (z1 > zmax) zmax = z1;
if (z1 < zmin) zmin = z1;
cin.read((char*)&x2,4);
x2 += p;
if (x2 > xmax) xmax = x2;
if (x2 < xmin) xmin = x2;
cin.read((char*)&y2,4);
y2 += p;
if (y2 > ymax) ymax = y2;
if (y2 < ymin) ymin = y2;
cin.read((char*)&z2,4);
z2 += p;
if (z2 > zmax) zmax = z2;
if (z2 < zmin) zmin = z2;
//
// skip attribute
//
cin.seekg(2,ios::cur);
//
// sort by z and save
//
int i0,i1,i2;
if ((z2 >= z1) && (z2 >= z0))
if (z1 >= z0) {i0 = 0; i1 = 1; i2 = 2;}
else {i0 = 1; i1 = 0; i2 = 2;}
else if ((z1 >= z2) && (z1 >= z0))
if (z2 >= z0) {i0 = 0; i1 = 2; i2 = 1;}
else {i0 = 1; i1 = 2; i2 = 0;}
else
if (z2 >= z1) {i0 = 2; i1 = 0; i2 = 1;}
else {i0 = 2; i1 = 1; i2 = 0;}
ax[i0][t] = x0; ay[i0][t] = y0; az[i0][t] = z0;
ax[i1][t] = x1; ay[i1][t] = y1; az[i1][t] = z1;
ax[i2][t] = x2; ay[i2][t] = y2; az[i2][t] = z2;
}
cerr << " xmin/max: " << xmin << ' ' << xmax << endl;
cerr << " ymin/max: " << ymin << ' ' << ymax << endl;
cerr << " zmin/max: " << zmin << ' ' << zmax << endl;
d = (xmax-xmin)/(nlattice-1.0);
int nx = nlattice;
int ny = (ymax-ymin)/(d*sqrt(3.0)/2.0);
int nz = (zmax-zmin)/(d*sqrt(2.0/3.0));
//
// loop over z slices
//
vector<float> xcross,px,py,pz;
int nsegments;
for (int iz = 0; iz < nz; ++iz) {
float z = zpos(iz);
//
// loop over triangles to find slice crossings
//
nsegments = 0;
for (int t = 0; t < ntriangles; ++t) {
if ((az[2][t] > z) && (az[0][t] < z)) {
//
// crossing found, check side
//
if (az[1][t] > z) {
float f10 = (z-az[0][t])/(az[1][t]-az[0][t]);
x0 = ax[0][t]+f10*(ax[1][t]-ax[0][t]);
y0 = ay[0][t]+f10*(ay[1][t]-ay[0][t]);
}
else {
float f21 = (z-az[1][t])/(az[2][t]-az[1][t]);
x0 = ax[1][t]+f21*(ax[2][t]-ax[1][t]);
y0 = ay[1][t]+f21*(ay[2][t]-ay[1][t]);
}
float f20 = (z-az[0][t])/(az[2][t]-az[0][t]);
x1 = ax[0][t]+f20*(ax[2][t]-ax[0][t]);
y1 = ay[0][t]+f20*(ay[2][t]-ay[0][t]);
//
// sort y and save segment
//
if (y1 >= y0) {
sx[0][nsegments] = x0; sy[0][nsegments] = y0;
sx[1][nsegments] = x1; sy[1][nsegments] = y1;
}
else {
sx[0][nsegments] = x1; sy[0][nsegments] = y1;
sx[1][nsegments] = x0; sy[1][nsegments] = y0;
}
++nsegments;
}
}
//
// loop over slice rows
//
for (int iy = 0; iy < ny; ++iy) {
float y = ypos(iy,iz);
//
// loop over slice segments to find crossings
//
for (int s = 0; s < nsegments; ++s)
if ((sy[1][s] >= y) && (sy[0][s] < y)) {
float f = (y-sy[0][s])/(sy[1][s]-sy[0][s]);
x0 = sx[0][s]+f*(sx[1][s]-sx[0][s]);
xcross.push_back(x0);
}
//
// sort crossings
//
sort(xcross.begin(),xcross.end());
//
// loop over slice columns
//
int pointer = 0;
bool inside = false;
for (int ix = 0; ix < nx; ++ix) {
if (xcross.size() > 0) {
float x = xpos(ix,iy,iz);
if (x > xcross[pointer]) {
//
// passed pointer, toggle side
//
inside = !inside;
++pointer;
if (pointer == xcross.size())
break;
}
if (inside) {
//
// inside, save point
//
px.push_back(x);
py.push_back(y);
pz.push_back(z);
}
}
}
xcross.clear();
}
}
int number = px.size();
cerr << " output " << number << " particles" << endl;
//
// output particles
//
cout << "type:" << endl;
cout << "FCC" << endl;
cout << "format:" << endl;
cout << "xyz float32" << endl;
cout << "xmin:" << endl;
cout << xmin << endl;
cout << "xmax:" << endl;
cout << xmax << endl;
cout << "ymin:" << endl;
cout << ymin << endl;
cout << "ymax:" << endl;
cout << ymax << endl;
cout << "zmin:" << endl;
cout << zmin << endl;
cout << "zmax:" << endl;
cout << zmax << endl;
cout << "links per particle:" << endl;
cout << 12 << endl;
cout << "number:" << endl;
cout << number << endl;
cout << "pitch:" << endl;
cout << d << endl;
cout << "particles:" << endl;
for (int i = 0; i < number; ++i) {
cout.write((char*)&px[i],4);
cout.write((char*)&py[i],4);
cout.write((char*)&pz[i],4);
}
cout << "end:" << endl;
}