Writing a mesh to an .obj file in a single line with Eigen

Alec Jacobson

April 29, 2015

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I was recently revisiting our igl::writeOBJ code and realized that for simple meshes, the code for writing an .obj file can be really simple:

ofstream("test.obj")<<
  V.format(IOFormat(FullPrecision,0," ","\n","v ","","","\n"))<<
  (F.array()+1).format(IOFormat(FullPrecision,0," ","\n","f ","","","\n"));

Update: And because why not, here's a .off writer:

ofstream("test.off")<<
  "OFF\n"<<V.rows()<<" "<<F.rows()<<" 0\n"<<
  V.format(IOFormat(FullPrecision,0," ","\n","","","","\n"))<<
  (F.array()).format(IOFormat(FullPrecision,0," ","\n","3 ","","","\n"));