Dear OpenFlipper friends and developers,
We are just now running into a problem while using the OpenFlipper for topo modelling and model simplification with the Decimater. The point is that geographical coordinates tend to be large numbers, but in some way you can say that the most significant digits are the least significant ones - because they never change throughout a model!
The problem is that once we have "decimated" a model and want to write it out to an OBJ file, the least significant digits are cut off by the C++ automatism of switching to exponential notation if numbers are getting large:
4522765.277 -> 4.52277e006
Which means: rounding to the next 10m occurs - not really acceptable!
Of course we are already practising the workaround of first shifting the coordinates to something lower, then do the OpenFlipper treatment, then shift back. But of course it would be nicer if the OpenFlipper would simply do the output with some explicit fixed formatting. Currently the code that outputs the coordinates in OBJ format is the following:
// Write out vertex coordinates _out << "v " << v[0] <<" "<< v[1] <<" "<< v[2] << std::endl;
This code is at FileOBJT.cc(299). Would it be possible to add some formatting to such output lines, in order to make it easier to work with large coordinate values? Or is there a danger that in such a case there would be people complaining that they are now not any more able to work in picometers properly? ;-)
Regards, Cornelis
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Cornelis Bockemühl Holcim Group Support Ltd Cement Manufacturing Services Materials Technology Reserve Evaluation and Quarry Planning Im Schachen CH-5113 Holderbank Phone +41 58 858 51 30 Fax +41 58 858 51 51 cornelis.bockemuehl@holcim.com www.holcim.com
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