Today I have reorganized the <view> handling and added a new
view mode. It's still work in progress, but looks quite nice
already: "Fly-By View" This picks a view position somewhere
ahead and lets the aircraft fly by, then searches a new position
etc. Nice for replay, or for experiencing how fast the aircraft
actually flies. (From cockpit view it looks always slow. ;-)
I still need to tweak the parameters and to prevent updates
when the aircraft has barely moved.
The reorganization part was desirable, because until today
the different <view>s had to have continuous indices. When
FlightGear predefined <view n="0"> to <view n="5">, then
aircraft had to continue with <view n="6">. A lot of aircraft
did that, but whenever one removed or added a generic view,
all aircraft <view> definitions had to be moved, which was
a huge PITA.
Now indices of <view> definitions can be freely assigned. To
avoid further, unnecessary collisions, I "suggest" (well,
*demand* :-) that aircraft use indices starting with 100,
leaving 0..99 for the "system". (Remember that you don't
have to specify the index in every definition. Setting n="100"
in one will automatically set the next to 101 etc., unless
otherwise specified.
I've also made a minor change to the way numbers are interpreted
when written to /sim/current-view/view-number: 0 and positive
numbers are treated like they used to, so everything works like
before: they select the (n-1)th <view>. But now that holes
are allowed, this does no longer necessarily match the node
index. To select a view with particular node index (e.g. the
aircraft's <view n="100">, one can write that as negative number:
setprop("/sim/current-view/view-number", -100);
This will, of course, immediately be turned into the normal
index (let's say 6), I expect that everyone forgets this feature
quickly, and that nobody uses it, except maybe a few notorious
C++ code readers. ;-)
m.
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