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Flatten Polygon Issues

B

Bell417

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14
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unitedstates
Hello,
I am working on a small, fictional bush airport in Alaska and I'm having some weird issues. It is located on a hillside so I drew a flatten and exclude polygon around the runway (20ft on either side and 40-50ft on either end). I compiled the .BGL to test it and discovered that for some reason, my polygon was not rectangular, but had a rather large lateral bulge on the downhill side and extended farther than 20ft on the uphill side. It also has small lumps at the four corners of the "rectangle". What is up?
 
scruffyduck

scruffyduck

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Staff member
FSDevConf team
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34,854
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unitedkingdom
Not sure but FSX will try and smooth the terrain between the flatten and the surrounding hill.
 
B

Bell417

Messages
14
Country
unitedstates
Is there any way I can lessen the effect? It looks pretty bad right now.

1241320644.jpg


What about the lumps at the corners of the flatten polygon, can I do anything about those?
 
Last edited:
jvile

jvile

Messages
8,893
Bell417 said:
Hello,
I am working on a small, fictional bush airport in Alaska and I'm having some weird issues. It is located on a hillside so I drew a flatten and exclude polygon around the runway (20ft on either side and 40-50ft on either end). I compiled the .BGL to test it and discovered that for some reason, my polygon was not rectangular, but had a rather large lateral bulge on the downhill side and extended farther than 20ft on the uphill side. It also has small lumps at the four corners of the "rectangle". What is up?
Click to expand...

When working around hillsides you must use the same technique that FSX uses to draw a poly. The triangles placed properly around the poly smooth the bulges and lumps that occur if you use just a flatten and exclude.



picture provided by George :)
 
B

Bell417

Messages
14
Country
unitedstates
That looks good, but I don't know where the hillside is in relation to the triangles in the picture.
 
GHD

GHD

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12,243
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england
Bell417 said:
That looks good, but I don't know where the hillside is in relation to the triangles in the picture.
Click to expand...
Run FSX and ADE in windowed mode. Connect ADE to FSX and move the user aircraft to the position of the vertices of the triangle, and read the ground height from the red figures on the top-left of the ADE grid.

 
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