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FSXA 3D ASI needle - nonlinearity

Vitus

Vitus

Resource contributor
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newzealand
Hi,

one of the many other things I procrastinate is the ASI and I hope you can help me with this.
I want to build a 3D instrument and the problem is its non linearity. I know that in 2D XML gauges you can define non linearity tables but how do you implement this behavior in a 3D needle?
One option I thought of is to define the keyframes in a non-linear way. But I am not sure if that is practical. What methods do you use?

Regards
Vitus
 
Actually, that is the only method of which I'm aware... :cool:
 
If you have a way to measure the angles, it really, really helps!
 
:confused: what do you mean by that? I don't need to know the angle - instead I adjust the keyframes. To give an example:
My ASI ranges from 0 to 310 mph. The correct keyframe for 150 mph will be:
150*100/310=48
I put the slider to frame 48 and animate-adjust the needle to show 150mph.
That was done for about 20 keyframes and it works quite well.
Actually, this is easier than I thought => no need for complex maths in XML though.

Regards
Vitus
 
Ah, you've chosen the easiest of two possible methods (and one which I would choose myself)...

...you've "hard coded" the "non-linearity table" via keyframes.

The other approach would use advanced math in the evaluation script, and a <Scale> entry. For that method you would need to know the angles for each non-linear arc segment's start/end points. :eek:
 
I see! I think I need some evaluations like that for my long-wave-receiver-frequency-selector.
radio01.jpg


Hopefully no big deal in this case...

Thanks Bill! And have a nice day!
Vitus
 
Thanks! Actually it's just basic stuff. :rolleyes: But the nice thing is: every switch and lever is animated and can be moved around. I am working on the coding now - it's already possible to slowly turn the loop antenna on top of the fuselage to pick up the bearing of the radio station :cool:
 
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