Reading of 3D model formats

[GoogleCodeExporter]

There are free graphical tools that may be used to build 3D models of
scatterers (consisting of one of may be a few domains). It would be
convenient if ADDA can directly read at least one of the common formats
produced by these tools.

Moreover, it will give a performance bonus, since rather expensive filling
of the computational grid from the 3D model can be done in parallel by ADDA.

Original issue reported on code.google.com by yurkin on 4 May 2009 at 4:55

[GoogleCodeExporter]

A discussion of possible starting points as well as possible workarounds can be 
found
in http://groups.google.com/group/adda-discuss/t/aed1c5195eec1e5a

Original comment by yurkin on 4 May 2009 at 5:06

[myurkin]

Several workarounds exist - https://github.com/adda-team/adda/wiki/FAQ#how-to-simulate-light-scattering-by-a-particle-which-shape-can-not-be-described-by-any-of-the-adda-predefined-shapes but we may still want to incorporate it inside the main ADDA code at some point.