Hi Butch:
First try to re-size the existing over-sized Exclusion
Rectangles, then place multiple other smaller ones as needed to eradicate unwanted objects.
Zoom in on the corner of a selected Exclusion Rectangle until you see the vertex point, grab it with the LMB, and drag it to re-size the Rectangle.
As for 'clearing the field' to allow placing static aircraft in parking areas, are you "Prepar3D" to place multiple small Exclusion Rectangles ?
IIUC, you are adding LM's Hangar at KMTN.
By extracting / inspecting the default P3D AB FLX Polygon, we find the (only ?) issue 'may' be that the LM Hangar is not included within its extents.
Are you "Prepar3D" to edit the Appended AB FLX Polygon in SBuilderX, or instead to 're-create' it in ADE, then edit it, to fix this ?
IIUC, LM's Hangar in default FS scenery is "
outside KMTN airfield", and you are getting a 'pop-up' (Autogen ?) building bleed-through in front of it.
I'll need to see if I can reproduce the 'pop-up' building bleed-through to confirm it is Autogen or instead placed by / from a local *.OBX file.
If the latter is from a local *.OBX, it is indeed a Scenery Library Object that calls for use of multiple "micro-excludes" as Scruffyduck calls them.
If it is Autogen, IIRC, P3D has the same rules for Exclusion Rectangles as FSX, in that they exclude "default" Autogen, but not custom Autogen.
If we find the unwanted 'pop-up' building bleed-through is a "custom" Autogen building, we can use a CVX vector Terrain Exclusion
Polygon.
If it is not using custom photo-real aerial imagery, we will need to see if a Airport Boundary / Background type is used that 'allows' Autogen display.
That would normally not be the type used at an airport when a Airport Boundary / Background Flatten is made.
The "normal" Airport Boundary / Background type used is the 3-attribute GUID: Flatten, MaskClassMap, Exclude (default) Autogen:
Airport_Backgrounds_Flatten_MaskClassMap_ExcludeAutoGen {46BFB3BD-CE68-418E-8112-FEBA17428ACE}
https://www.prepar3d.com/SDKv6/sdk/world/terrain/vector_shape_properties_guids.html
But, in fact, by inspecting the default P3D AB CVX Polygon, we find the (only ?) issue may be that the LM Hangar is not included within its extents.
So, we must look to see if a CVX Vector "Exclude" has pre-empted the default P3D AB CVX Polygon.
Please tell us which KMTN FSX add-on this is derived from (there seem to be 3 available; I suspect this is Tom Neubauer's version, but not sure).
https://simviation.com/1/browse-All+Files-8-1403
https://dl.simviation.com/download/...KMTN.zip&sessionId=2la9umd8ki09mc9nn5o18f6cj3
Please tell us where we can download this FSX add-on to confirm which type of 'pop-up' building bleed-through is to be dealt with.
Also, please tell us if this add-on in its current state, is using custom photo-real aerial imagery.
GaryGB