* Robicd -- Thursday 23 February 2006 11:42:
* * Melchior FRANZ:
> > Reading the documentation is *strongly* recommended before you complain.
> > It's a bug in your XML code.
> 
> Of course, Melchior, I wasn't complaining :-) Did I?

It was the "Or is that a bug too?" that made me explode. It's not like
the "material" animation is a bug ridden piece of code. Yes, there was
a bug, but if the animation doesn't work like you expect it to, it's
still *far* more likely caused by user error, than a bug.  :-}



> I was looking for some suggestions because I find the only documentation 
> available for non programmers (which is the model-howto.html) a little 
> bit confusing regarding factor, offset and -prop stuff.

Factor and offset work the same in all animations that offer it.
They are applied to a <value> or <property> like so:

  (value * factor) + offset   [redundant parens added for educational purposes 
;-]


And <*-prop> does always mean that the contents are supposed to be a
property path. This is also used elsewhere, and not a "material" feature.

I agree that the documentation could use some improvements, but I
wouldn't say that the examples for the material animation are 
unclear with respect to the difference between <red> and <red-prop>:

  <red>1.0</red>
  ...
  <red-prop>diffuse/red</red-prop>


When I need information about an animation, I look into three sources:
the model-howto.hml, simgear/scene/model/animation.[ch]xx, and animation
files in $FG_ROOT/Aircraft/*. The second source shouldn't be necessary,
but until someone comes along and completes the model-howto this is a
good enough workaround.

m.


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