WKB initial field

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Use internal field from WKB approximation as an input for the iterative
solver. Should be effective for index-matching particles.

Original issue reported on code.google.com by yurkin on 24 Dec 2008 at 7:56

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This should be implemented (in some form) by the end of 2010.

Original comment by yurkin on 22 Mar 2010 at 6:19

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Original comment by yurkin on 22 Mar 2010 at 6:23

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First implementation of the WKB incident field is done by r981, but it has a 
major limitation. It only works for the default incident direction (along the 
z-axis in the particle reference frame). 

Preliminary tests that using this option leads to some acceleration for 
index-matching particles (up to 20% decrease in number of iterations).

Original comment by yurkin on 29 Sep 2010 at 6:15

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Original comment by yurkin on 2 Dec 2010 at 4:40

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Original comment by yurkin on 22 Apr 2011 at 2:39

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Currently WKB does not work at all in sparse mode. However, that is probably 
fine, since it is not expected to be a good approximation for sparse objects 
(where no large homogeneous parts are present). 

Original comment by yurkin on 4 Feb 2013 at 5:32

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Original comment by yurkin on 4 Feb 2013 at 5:34

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Specific formulae to transform from WKB field to starting vector were slightly 
changed (improved) by r1223.

Original comment by yurkin on 4 May 2013 at 5:17

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It should also be made operational together with -surf

Original comment by yurkin on 25 Sep 2013 at 10:21