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V2 ref and disappearing ground ploys...

A

acbent

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canada
Seems to be one of those days for me... I can't cure a disappearing ground poly now. I have steadily increased the V2 ref and at certain locations when turning the poly disappears at certain angles. Is there any set formula or guidelines to use when setting the v2 ref? Should just continually increase the v2 ref until the problem stops or will it ever?

EDIT: Oh yes, and another strange thing...not only does the ground poly disappear but so do the taxilines which are on a completely different bgl and have a different draw distance and v2 ref. This stuff get frustrating some times.

Thanks,

Adam
 
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Hi Adam,

The v2 value is very easy to calculate. The optimum value is the radius of a circle from the reference point where all objects of that reference point fit in. So for your ground polygons it should be the distance from the reference point, to the point furthest away from it.

How big is the area covered by your ground polygons btw? I once tried to make all of them for a big complex airport in one file and it seemed the airport was just too big to fit in one Area command, so I had to split it.
 
Me and some others have the same problem. At certain locations and headings, the poly disappears.
The ground is made up of different layers, every one in its own bgl file exported at the same reference point, but they all have individual V2 values (as not every layer has the same radius...).
You wrote: "The optimum value is the radius of a circle from the reference point where all objects of that reference point fit in".
Does that mean, I have to edit all the V2 values of the different layers to the maximum one (in my case, that of the master-ground-bitmap-layer)?

-Jeff
 
Hi Jeff,

No, I did not phrase that sentence accurately enough. Each Area in the BGL file has its own reference point (although the coordinates of these reference points can be the same). For each RefPoint (SCALE_AGL) command the v2 value must be the radius of all object in that RefPoint. So if you have multiple BGL files they can all have different values.
 
Hi Arno and others,

I'm still having this problerm and I think it's because I am in fact covering too large an area. The problem is this: It would be extremely difficult to re-align my ground polys if I have to export them all centered around ref 0,0 for each in GMAX. I don't think I could ever get them lined up. Is there any other work around? I did export each of the 6 planes separately but still have the problem as of course they are not each centered around 0,0. I have played with many many v2 ref distances in the asm file but all that does is make it disappear at different locations and angles.

Appreciate any help.

Thanks,

Adam
 
What is the size of the area you are trying to cover? I once had trouble when that area was to big for one RefPoint.
 
Hi Arno,

Well the runway is 13000ft and the ground polys extend a bit beyond that north and south. It is a very large area.

If you like I could use something like fsvalues to give you a more accurate figure.

EDIT: There are 2 bgls, each has 3 planes. The default v2 refs are 2972m and 3037m.
Also interesting is that when the ground polys disappear, so do the custom taxilines and apron polys I have put down. Everything on the ground seems to go at once even though they have different vref values, It's strange.
Thanks!

Adam
 
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Hi Adam,

acbent said:
Well the runway is 13000ft and the ground polys extend a bit beyond that north and south. It is a very large area.
Click to expand...

OK, but that is not so large that I would expect trouble. My problem happened with a much bigger area.

acbent said:
Also interesting is that when the ground polys disappear, so do the custom taxilines and apron polys I have put down. Everything on the ground seems to go at once even though they have different vref values, It's strange.
Click to expand...

Are these markings in the same BGL file or in a different one? And are they all made with GMax?
 
Hi Arno,

It's good to know that the area is not too large.

They are in separate bgls and they are all made in GMAX.

Basically I have 6 large planes down which are what I call the overlay. These go on layer 6. On top of that I have custom polygons which are textured with an XForm applied. On top of those, I have the taxilines. The taxilines are one bgl. The custom ploygons on top of the overlay comprise 3 separate bgls.

Is there any other info you need? I really appreciate your help and would like to solve this.

Thanks Arno!

Adam
 
Hi Adam,

I am starting to run out of ideas :), as the things you describe sound correct. Could you maybe send me the BGL files so that I can have a look at them here?
 
Hi Arno,

Happy to send you the bgl's. Do you want the asm files as well?
Where would you like me to send them to?

Thanks again Arno for all your valuable help.

Adam
 
Hi Adam,

All information is welcome, so also the ASM files. You can sent everything to my email address: arno _AT_ scenerydesign _DOT_ org
 
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