Originally I tried to leverage an environment mapping trick to
impliment the VASI.  However, my understanding of how this work was
not quite right, nor was the understanding of the person who suggested
this trick in the first place.  The result is that the VASI is
dependent on the view direction, and not on your relative position to
the VASI.  This is clearly wrong and I need to backup and do it over.
This is high on my todo list, but it will involve a substantial amount
of effort to do correctly.  There is no trivial fix to be had here.
We need a complete reimplimentation from scratch.  I was hoping for
some time over the holidays, but most of my time is getting sucked up
with family obligations and events and get togethers.  And my wife
thinks she should be seeing progress on our basement remodeling
project.

Regards,

Curt.


Dave Perry writes:
> I have posted this observation before.  but since the topic came up 
> again, I will post this again.
> 
> I have the "hat switch" configured so it allows smooth changes in vies 
> as if I am moving my head (hen inside the plane) or moving my view point 
> and view direction in an outside view.
> 
> When in an outside view
> 1.   If  my vasi view line is below the center of the aircraft, all the 
> lights are white.
> 2.   If my vasi view line is above the center of the aircraft, all the 
> light are red.
> 3.  If my vasi view line passes throught the center of the aircraft. 
> half the lights are red and half are white.
> 
> Its as if the light color is determined by where the aircraft is 
> relative to my line of sight to the vasi lights instead being determined 
> by where the aircraft is relative to the 3 degree line.
> 
>  From the normal inside view, all the lights stay red as the center of 
> the aircraft is still below my eyes (i.e. plane location is below the 
> line of sight to the vasi lights). 
> 
> If I knew where to look in the code, I would look to see if the wrong 
> decision reference is being used (plane location wrt line of sight 
> instead of plane location wrt 3 degree line).
> 
> Hope this helps,
> dave
> 
> 
> 
> 
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-- 
Curtis Olson   HumanFIRST Program               FlightGear Project
Twin Cities    curt 'at' me.umn.edu             curt 'at' flightgear.org
Minnesota      http://www.flightgear.org/~curt  http://www.flightgear.org

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