Subject: CGAL users discussion list
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- From: Tom Van Doorsselaere <>
- To:
- Subject: [cgal-discuss] write out and read in (Delauney) triangulation
- Date: Fri, 08 May 2015 17:27:41 +0200
Dear CGAL enthousiasts,
I'm building a program for the rendering of emission of solar coronal
models. For that I'm doing simulations first, computing the
triangulation, which I then render onto artificial images. Since it is
the bottleneck of the computation, I would like to store the
triangulation, to be read in again for the rendering stage.
I have attached a minimal representation of my code, with test data. I
have compiled the code with gcc version 4.4.7:
g++ -frounding-math -std=gnu++0x -g -Wall -lCGAL -lgmp -o testreadin
testreadinwriteout.cpp
and then run it with
-----------------------
> ./testreadin --write
writing out triangulationGelukt
-----------------------
and
-----------------------
>./testreadin --read
terminate called after throwing an instance of 'CGAL::Assertion_exception'
what(): CGAL ERROR: assertion violation!
Expr: false
File: /usr/include/CGAL/Triangulation_3.h
Line: 5321
reading in triangulationAborted
-----------------------
I have no idea what can cause this issue, because I have checked the
validity of the triangulation in the write stage, and I would expect a
written valid triangulation to be read in again as one.
Even more confusing is that when I remove the conversion from
cylindrical coordinates in the data file to cartesian coordinates in the
code (i.e. line 82 and 83 in the attached program), then the reading in
and writing out is no issue and both stages work as expected.
What important issue am I missing here?
Thanks for your input!
Tom
#include <fstream> #include <sstream> #include <cstdlib> #include <cmath> #include <CGAL/Exact_predicates_inexact_constructions_kernel.h> #include <CGAL/Delaunay_triangulation_3.h> #include <CGAL/interpolation_functions.h> using namespace std; typedef CGAL::Exact_predicates_inexact_constructions_kernel K; typedef CGAL::Delaunay_triangulation_3<K, CGAL::Fast_location> Delaunay_triangulation_3; typedef K::Point_3 Point; Delaunay_triangulation_3 DT_global; void writetriangulation(const string snapsave, const Delaunay_triangulation_3 *DTpointer) { ofstream out(snapsave,ios::binary|ios::ate|ios::trunc); if (out.is_open()) { if (DTpointer!=NULL) out << *DTpointer; out.close(); } else cout << "Unable to write to " << snapsave << endl; } void readtriangulation(const string snapsave, Delaunay_triangulation_3 *DTpointer) { ifstream in(snapsave,ios::binary); if (in.is_open()) { if (!in.eof() && (DTpointer!=NULL)) { in >> *DTpointer; // Check is this is a valid Delaunay triangulation //assert(DTpointer->is_valid()); } in.close(); } } int main(int argc, char* argv[]) { stringstream ss; ss << "vae2_delta1_t=0.test2"; string filename=ss.str(); ss.str(""); ss << "emissionsave"; string snapsave=ss.str(); ss.str(""); if (strcmp(argv[1],"--write")==0) { cout << "writing out triangulation"; int dim=3; int ng = 500/2; int nvars = 5; // \rho, T, vx, vy, vz vector<double> * grid=new vector<double>[dim]; vector<vector<double>> allvar; allvar.resize(nvars); double r, theta; ifstream in(filename,ios::binary); if (in.is_open()) { for (int i=0; i<dim; i++) { grid[i].resize(ng); } for (int i=0; i<nvars; i++) { allvar[i].resize(ng); } for (int j=0; j<ng; j++) { for (int i=0; i<dim; i++) in >> grid[i][j]; for (int i=0; i<nvars; i++) in >> allvar[i][j]; r=grid[0][j]; theta=grid[1][j]; // grid[0][j]=r*cos(theta); // grid[1][j]=r*sin(theta); } in.close(); } vector<Point> delaunaygrid; delaunaygrid.resize(ng); for (int i=0; i<ng; i++) { delaunaygrid[i]=Point(grid[0][i],grid[1][i],grid[2][i]); } DT_global.insert(delaunaygrid.begin(),delaunaygrid.end()); assert(DT_global.is_valid()); assert(DT_global.dimension()==3); writetriangulation(snapsave,&DT_global); } else { Delaunay_triangulation_3 DT; cout << "reading in triangulation"; readtriangulation(snapsave,&DT); assert(DT_global.is_valid()); } cout << "Gelukt\n" ; return EXIT_SUCCESS; }0.033330176 0.00000 -15.000000 1.0001896 1.0000000
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- [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/08/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Monique Teillaud, 05/11/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/12/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/12/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/12/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Monique Teillaud, 05/12/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/13/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Monique Teillaud, 05/13/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/13/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Monique Teillaud, 05/12/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/12/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/12/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Tom Van Doorsselaere, 05/12/2015
- Re: [cgal-discuss] write out and read in (Delauney) triangulation, Monique Teillaud, 05/11/2015
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