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Do I need a Flatten Polygon?

clements

clements

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unitedstates
I've made a ground polygon to create a photo background for an airport that I'm working on to learn about scenery design/building in FS2004. It looks good from a distance but when I'm sitting at the airport, I can see the default runway and taxiways as well as the default grass background (which I guess is a VTP polygon). How do I get rid of this stuff?

Based on my reading here on these boards, it sounds like I need to create a flatten poly. Would that make sense?

If I need to create a flatten, how big should it be? My ground poly is larger than the area that the default runway, taxiways and background sits on. Should I make the flatten as big as my ground poly or just big enough to cover the default stuff?

Thanks for your insight and help fixing my problem.

Bob
 
After searching the forums here and doing a lot of reading, I started to understand the problems that I was seeing, downloaded SBuilder over the weekend, and learned how to create LWM and Exclude polys. For other inexperienced developers out there, I created an Exclude poly to remove the default airport bitmaps and an LWM poly to flatten the area my Gmax ground poly sits. SBuilder allowed me to do both of these things easily.

Still, I'm have a problem that I'm hoping to get some help/advice with. Namely, the default landclass textures and runway/taxiways are bleeding through the ground poly in several places. I've attached two screen shots to demonstrate the problem. In the first screenshot (GPIssue.jpg), my flatten is set to the same altitude as the airport (based on figures that I've taken from ADE). In the second screenshot (GPIssue-2.jpg), I've raised the flatten by .1 meter (per several threads and ScruffyDuck's SBuilder tutorial on textured poly's). As you can see the the raised flatten covers the default textures where it didn't before but exposes the default textures where it was covered before (it also causes aircraft to appear slightly sunken into the terrain, which is an effect that I'd like to avoid).

I should say that this is a FS2004 scenery. Also, I've created the ground poly using Gmax and the ASM tweak outlined in the Wiki. Any insight into a fix for this problem is appreciated.

Bob
 

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Hi Bob.

While you may need a flatten, I would set it to the exact airport altitude.

Your GMax ground poly can then be set to altitude + 0.01m... hovering a tiny bit above the runway. This won't cause the wheels to sink much, and resolves the bleed-through.

Dick
 
Thanks, Dick. I truly appreciate the insight. You're recommendation worked like a charm.

Bob
 
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