[Flightgear-devel] Re: Helicopter Animations

[Melchior FRANZ]

* Jim Wilson -- Wednesday 28 April 2004 06:17:
 Probably the blades are doing a lot more than just spinning around the hub.

Yes, indeed. Each blade consists of 5 segments which are animated in a way
to make the blade appear bended (flap angle). Then each of these is rotated
according to the incidence angle, and finally rotated. All in all, the bo105
uses 101 animations, with more to come.



 In any case, the same issue you mention is there even with the spin/rpm
 animation used on the props. At full rpm you really can't see the blades
 at all on the real thing, except _maybe_ a blur that gets darker in the
 center.

Yes. The animation is work in progress. I'm now fading out the blades a
bit already, and I will fade in a blurry rotor disk as the next step.
Still there will be an interference effect, like in real life when you
see a rotor in a film, where the rotation frequency interferes with the
sample frequency. The rotor may look like standing still or spinning
slowly, even in the wrong direction. That's hard (or rather impossible?)
to avoid.

m.

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Re: [Flightgear-devel] Re: Helicopter Animations

[Chris Horler]

 * Jim Wilson -- Wednesday 28 April 2004 06:17:
  Probably the blades are doing a lot more than just spinning around the
  hub.
Indeed (I knew this), but for a slave machine and potentially multiplayer I do 
not believe it is sensible to do any more than get the propeller spinning and 
when it reaches full speed display a disc discolouration.

 Yes, indeed. Each blade consists of 5 segments which are animated in a way
...
 the bo105 uses 101 animations, with more to come.

 sample frequency. The rotor may look like standing still or spinning
 slowly, even in the wrong direction. That's hard (or rather impossible?)
 to avoid.
A fair point which whistled by me... I guess I must have been immersed in the 
flightgear environment.  

I would guess once the rotor exceeds the framerate you'll have problems?
Not a problem to consider after a 12 hour day at work... I'll let someone else 
take up the mantle.

Chris

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