[Simphysmodel-devel] Fields Work

[Richard S. <ric...@bt...>]

I've done some work to generalize the concept of a field, so it can
easily be extended to add new fields, and the existing ones, Gravity and
E-field can be turned on and off, eg. simulating free fall, a field
which acts with strength 9.8 N/kg in z-direction, with Newtonian Gravity
turned off.

Fortunately it runs at the same speed (in fact even faster with some
other changes I made). 

It uses function pointers so general field strength functions can be
used, I haven't done any work yet so this can be written to and imported
from a file, but that is to come.

I'll commit this later tonight, unless anyone objects.

Richard
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