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Custom Ground Polys


I have a scenery project I doing for Fresno Yosemite Intl (KFAT).

I'm in the process of creating the custom ground polygons for the taxiways and aprons in gmax. My question is concerning creating the taxiway edges, mainly where the curves.

I'm using the the plane tool to create the taxiway edges.

Is there an effective way of bending the plane to match the curves on the taxiways? What would be the best way of going about this?

Thank you for your time and help,

I've been working on this too. I believe there was a tutorial in the resources section, but here's the highlights:
Create a line (spline) in top-down view and edit the tangents so that it lines up well.
In a side view (left, right, back, or front) create a rectangle spline with width being how wide you want it to be and height being irrelevant (but greater than 0).
Edit the rectangle spline and remove the three segments besides the top segment.
Loft the remaining rectangle segment with the line as a path and apply mapping in the options.

I'm posting on mobile so I can't quickly add pictures but like I said there should be a tutorial in the resources section.