New particle shapes

[GoogleCodeExporter]

Implement general shapes like 'coated ellipsoid', 'boxsphere', 'spherebox'
with a lot of input parameters. It may be also implemented as a arbitrary
composition of basic shapes.

Original issue reported on code.google.com by yurkin on 24 Dec 2008 at 7:04

[GoogleCodeExporter]

Arbitrary composition part has been moved to a separate issue 79. Here we need 
only
to implement those relatively simple shapes that are needed by users. Cluster of
spheres should probably be the first candidate.

#79

Original comment by yurkin on 7 May 2009 at 4:18

[GoogleCodeExporter]

Two recent tools: 'misc/pip' and 'misc/hyperfun' allow relatively easy 
generation of almost any homogeneous. So this can be considered as a workaround 
of this issue.

Original comment by yurkin on 17 Jan 2012 at 3:21

[GoogleCodeExporter]

Another simple but powerful option is a general prism, where the contour in 
xy-plane is given by a file (like axisymmetric). This cross-section is 
translated along the z-axis (or generally along any tilted vector to allow 
non-orthogonal prisms). 

Original comment by yurkin on 19 Oct 2012 at 3:05

[myurkin]

Another idea is to use this tool - https://github.com/karimnaaji/voxelizer

[myurkin]

Super-ellipsoid is another idea - very broad class and should be easy to implement. See https://en.wikipedia.org/wiki/Superellipsoid

[myurkin]

I have moved several ideas for new shapes to separate issues (in addition to those mentioned above) - #292, #293, #294, #295 . So the issue can now be closed.