Melchior FRANZ said:
> I've added two shadows for the bo105 (after Jim beat me to it :-),
> but I can't animate them correctly. The situation is so strange that
> it must be a bug in fgfs.
>
> I've got objects "shadow_fuselage" and "shadow_rotor". Both are very
> flat, textured boxes. The strategy is:
>
> A. rotate the rotor shadow
> B. scale both shadows according to pitch/roll
> C. translate both shadows down to -AGL height
>
>
> 1. Problem: it *has* to be a box. SimGear refuses to translate a
> mere (2D) plane!
It probably has to be more than one surface. Thanks to the @#$%^ optimizer in
plib. All you need to do is cut it in half.
> 2. SimGear refuses to rotate the rotor shadow alone (A). The object
> remains fixed like the fuselage shadow. If I add the fuselage
> shadow, both are rotated! The rotor shadow is also rotated if I
> remove the fuselage shadow from steps B and C.
Be careful about listing more than one object in a single animation entry.
It'll merge previously listed animations.
> 3. Where the rotor shadow overlays the fuselage shadow, the resulting
> color is darker than either shadow. The shadows add. I mentioned
> that problem a while ago, and as a solution it was suggested to
> swap the two objects in the *.ac file. This, however, doesn't work.
That's right it doesn't. I'm not sure that there is a solution for this
issue in the ac3d format.
> I don't understand what animation type "alpha-test" really does.
> The documentation is quite vague and lacks an explanation that can
> be understood by idiots like me. ("The effect is to avoid depth
> buffer writing of pixel that are not seen because they are transparent."
> ?? why would I want to do that in some cases, but not in others.
> How does the problem look like, and how does it look when it's fixed.
> What does the value do? The textures do already have an alpha
> factor!?)
This I'm not sure of, but it might have something to do with not processing
fully transparent objects. Transparency could vary depending on the
alpha-blend settings and if the transparency is full this might be a way of
just deselecting the object at the application level. Based on my
recollection of discussion on the list last week, that's probably what you
are looking at.
Best,
Jim
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