Level of detail (LOD) ranges are controlled several properties in FlightGear, with the below default values.
Scenery ranges
| Note The LOD ranges are only set during the scenery loading process. Therefore a scenery reload may be required to change the currently loaded tiles.
|
| Property |
Default |
Description
|
sim/rendering/static-lod/detailed |
1500 m |
All objects (buildings etc) display withing this range.
- Building meshes using OBJECT_BUILDING_MESH_DETAILED
- The actual visibility range is randomly distributed from
/sim/static-lod/rough to twice /sim/static-lod/rough, to reduce apparent "popping".
|
/sim/rendering/static-lod/rough |
7500 m |
Terrain and non terrain objects will be displayed within this range, as follows:
- Objects listed in scenery STG files using OBJECT_STATIC or OBJECT_SHARED verbs
- Random scenery objects
- Random trees
- Random buildings
- Building meshes using OBJECT_BUILDING_MESH_ROUGH.
The actual visibility range is randomly distributed from /sim/static-lod/rough to twice /sim/static-lod/rough, to reduce apparent "popping".
|
/sim/rendering/static-lod/bare |
21000 m |
Only terrain after this point
|
AI/MP ranges
| Note For a while now FG supports size based LOD - this is the size of the model on screen in pixels and can be configured in the static lod dialog. All models should have an assigned fallback model; this is a low detail model that can be used for models that are further away.[1]
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AI/MP models (other models that aren't being flown/operated by the user) have two models. The first of these is the low detail (or fallback) model, which can be defined by an model developer (sim/model/fallback-model-index) as one of the values in $FGData/AI/Aircraft/fallback_models.xml. When there is no fallback model defined for a model the blue-yellow glider will be used.
There are three properties that control the operation of the LOD ranges for
We also have the following settings used for AI models:
| Property |
Default |
Description
|
/sim/rendering/static-lod/aimp-range-mode-distance |
false |
When true the distances in the following aimp- properties are considered to be the distance from the camera.
|
/sim/rendering/static-lod/aimp-detailed |
400 px |
This property works differently depending on the range mode.
- In pixel mode it is the size (in pixels) of the object on screen. When greater than this amount of pixels the detailed model will be used
- In range mode it is the distance from the viewpoint, when within this range the detailed model will be used.
|
/sim/rendering/static-lod/aimp-bare |
0 px |
This property works differently depending on the range mode.
- In pixel mode it is the maximum size (in pixels) of the object on screen. When below this amount the low detail (fallback) model will be used. It is possible to set this to a non-zero value to stop drawing anything when close (although quite why anyone would want to do that is beyond me), and thus a value of 0 is the expected usage of this in pixel mode.
- In range mode it is the distance from the viewpoint, when above this distance the low detail model will be used.
|
Model interiors
| Property |
Default |
Description
|
/sim/rendering/static-lod/aimp-interior |
200 m |
Range at which to display the model interior (when the model has a mesh defined as being the interior).
|
Related content
Wiki articles
Forum topics
Source code
(April 2020-) - Touches on the subject of not using LOD range animations in scenery models.