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Replacing terrain - how much is too much?

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unitedstates
I've been loving MSFS, and am just starting to dip my toes into the SDK. Flying around the Shetland Islands I've noticed some cool-looking but unrealistic geometry (see the area around EGPM for a good example). It would be nice to replace some of it, and I know you can import data from Google Maps. I assume there's a performance hit - my question is how much can I do before the game slows to an unmanageable crawl? Does it matter that the geometry isn't very complex (almost no buildings)? Is there a more efficient way to do it?
 
You cannot replace the mesh yet as far as I know, just changing imagery will not fix the particular issue it seems you are describing. You can flatten them manually or terraform with the tool and build a separate project for it. If you are talking about adding individual objects or individual hills/mtns using photogrammetry, the performance hit is massive once you get past a certain number, depends on your specs as always.
 
You cannot replace the mesh yet as far as I know, just changing imagery will not fix the particular issue it seems you are describing. You can flatten them manually or terraform with the tool and build a separate project for it. If you are talking about adding individual objects or individual hills/mtns using photogrammetry, the performance hit is massive once you get past a certain number, depends on your specs as always.

Ah, OK, thanks for the clarification.
 
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