• Which the release of FS2020 we see an explosition of activity on the forun and of course we are very happy to see this. But having all questions about FS2020 in one forum becomes a bit messy. So therefore we would like to ask you all to use the following guidelines when posting your questions:

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GP Textures

Be warned though that no lights or taxiway lines and such will show up when a gp poly overlays them.
And again: do not ask me why if that is what you would like to know
Click to expand...
Roby, as has been explained several times in this forum, ground polys are always drawn on top of airport objects by Flightsim. How else could you, for example, place apron markings using ground polys

Don
 
robystar said:
Hi Gary,

About your two questions: I think 'yes' and 'yes' because you get all kinds of weird artifacts if you do not use flattens underneath the gp polys. Don't ask me why!
Click to expand...

robystar said:
Just to add from experience:
- As long as you have a flatten, you can leave out the apron or other hardened surfaces when creating gp polys on top.
- Be warned though that no lights or taxiway lines and such will show up when a gp poly overlays them.
And again: do not ask me why:( if that is what you would like to know?:)
Click to expand...

Hi Roby:

I also suggest that a vector flatten is a required part of creating an airport intended to be flat (with or without intended use by traffic objects).

I further suggest that Aprons / Taxiway Paths should not be used just to provide flattening at an airport, and am hoping to determine whether one can create an airport without Aprons ...if they are not required for traffic functionality.

[EDITED]

http://www.fsdeveloper.com/forum/showpost.php?p=542724&postcount=4

http://www.fsdeveloper.com/forum/showthread.php?p=598097

[END_EDIT]



FYI: If the terrain is not flat underneath a flat / planar object such as a GP or the bottom part of a 'light splash' on a volumetric light cone from a ex: "ramp light" scenery object:

* terrain may pop-up through the level of the superimposed flat / planar object

* variable surface height of underlying terrain may make it more difficult to establish a sufficiently wide elevation gap in between the underlying terrain and the superimposed flat / planar object


...this leads to 'flickering' / moire patterns due to "Z-Buffer fighting", which (for reasons I also don't yet understand), is even more problematic in FSX SP2 than in prior versions of FS). :banghead:


The flickering (aka "Z-Buffer fighting") as Don aptly describes in the GP Manual, can be seen at various angles and elevations when observing closely superimposed objects even when they are both flat.

But if one or both such surfaces described above are not flat, then the visual anomalies are difficult or impossible to eliminate in FSX SP2. :alert:


It is especially important, IMHO, in scenarios where GPs and/or ramp lights with light splashes on ground are to be used, to always use a vector flatten at the area of an airport intended to be flat. :spushpin:

Then, IMHO, it is important to fly ex: the trike in a circuit at several altitudes up to 1000 Ft. around the edges of those areas / objects to inspect for any visible flickering (aka "Z-Buffer fighting") when seen from above ground. :idea:

PS: Ramp light scenery objects can be raised in their assigned Altitude placements, so that their "light splashes" lie on top of the plane of textured GPs. ;)

GaryGB
 
Last edited:
Hi,

Yes, Don, I know. That is why I said it once more for those, like me, that did not know for sure.
Right, Gary, the only point I wanted to make was that (as Don just said once more but maybe not entirely clearly put;)): lights, textures and lines of taxipaths, apron paths and runways will not show up underneath gp_poly's.
Of course you can make light objects and other scenery objects on top of them.
Perhaps Jon, who is thinking of adding more than one ARP to an airport (at different elevations), can remedy this?
 
Perhaps Jon, who is thinking of adding more than one ARP to an airport (at different elevations), can remedy this?
Click to expand...

No. Whatever the elevation of the ground that is where the XML generated elements get placed and the GP Objects will always be over them. There is no way to get any XML generated elements to show over GP objects.
 
robystar said:
Just to add from experience:
- As long as you have a flatten, you can leave out the apron or other hardened surfaces when creating gp polys on top.
- Be warned though that no lights or taxiway lines and such will show up when a gp poly overlays them.
And again: do not ask me why:( if that is what you would like to know?:)
Click to expand...

Thank you!
 
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