Level Of Detail (LOD) Ranges: Difference between revisions
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Level of | '''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.}} | |||
{| class="wikitable" | |||
|- | |||
! Property !! Default !! Description | |||
|- | |||
| <code>sim/rendering/static-lod/detailed</code> || 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 <code>/sim/static-lod/rough</code> to twice <code>/sim/static-lod/rough</code>, to reduce apparent "popping". | |||
|- | |||
| <code>/sim/rendering/static-lod/rough</code> || 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 <code>/sim/static-lod/rough</code> to twice <code>/sim/static-lod/rough</code>, to reduce apparent "popping". | |||
|- | |||
| <code>/sim/rendering/static-lod/bare</code> || 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.<ref>https://sourceforge.net/p/flightgear/mailman/message/37220137/</ref>}} | |||
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 (<code>sim/model/fallback-model-index</code>) as one of the values in <code>$FGData/AI/Aircraft/fallback_models.xml</code>. When there is no fallback model defined for a model the blue-yellow glider will be used. | |||
AI/MP ranges can either bet set as pixels of the object on screen, or distance from the viewer in meters. This is controlled by the <code>/sim/rendering/static-lod/aimp-range-mode-distance</code> property. | |||
{| class="wikitable" | |||
|- | |||
! Property !! Default !! Description | |||
|- | |||
| <code>/sim/rendering/static-lod/aimp-range-mode-distance</code> || false || Configures the range mode: | |||
* If set to false the values of <code>/sim/rendering/static-lod/aimp-detailed</code> and <code>/sim/rendering/static-lod/aimp-bare</code> are pixels on the screen. This is default. | |||
* | * If set to true, the values are distance from the camera in meters. | ||
* | |- | ||
* | | <code>/sim/rendering/static-lod/aimp-detailed</code> || 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. | ||
|- | |||
| <code>/sim/rendering/static-lod/aimp-bare</code> || 0 px || This property works differently depending on the range mode. | |||
* In pixel mode it is the minimum size (in pixels) of the object on screen. | |||
** If the object is below <code>/sim/rendering/static-lod/aimp-bare</code> pixels in size, it will not be displayed. | |||
** When the number of pixels is between <code>/sim/rendering/static-lod/aimp-bare</code> and <code>/sim/rendering/static-lod/aimp-detailed</code>, the low detail (fallback) model will be used. | |||
* In range mode it is the distance beyond the <code>/sim/rendering/static-lod/aimp-detailed value</code>, at which the low detail model will be used. I.e. the low detail model will be used in the range from <code>/sim/rendering/static-lod/aimp-detailed to (/sim/rendering/static-lod/aimp-detailed + /sim/rendering/static-lod/aimp-bare)</code> . | |||
|- | |||
|<code>/sim/rendering/static-lod/aimp-interior</code> | |||
|200m | |||
|Range at which to display the model interior (when the model has a mesh defined as being the interior). | |||
|} | |||
== | == Related content == | ||
* | === Wiki articles === | ||
* [[FlightGear configuration via XML]]. See in particular the section [[FlightGear configuration via XML#Adding your own settings|Adding your own settings]]. | |||
=== Forum topics === | |||
* {{forum link|t=37353|title=3d models, how to produce them in an understandable way}} (April 2020-) - Touches on the subject of not using LOD range animations in scenery models. | |||
=== Source code === | |||
* {{fgdata source|path=defaults.xml}}. Do not change this file, rather follow [[FlightGear configuration via XML#Adding your own settings|these instructions]]. | |||
* {{simgear source|path=simgear/scene}} | |||
[[Category:Rendering]] | |||
Latest revision as of 20:52, 17 December 2023
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.
|
/sim/rendering/static-lod/rough |
7500 m | Terrain and non terrain objects will be displayed within this range, as follows:
The actual visibility range is randomly distributed from |
/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] |
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.
AI/MP ranges can either bet set as pixels of the object on screen, or distance from the viewer in meters. This is controlled by the /sim/rendering/static-lod/aimp-range-mode-distance property.
| Property | Default | Description |
|---|---|---|
/sim/rendering/static-lod/aimp-range-mode-distance |
false | Configures the range mode:
|
/sim/rendering/static-lod/aimp-detailed |
400 px | This property works differently depending on the range mode.
|
/sim/rendering/static-lod/aimp-bare |
0 px | This property works differently depending on the range mode.
|
/sim/rendering/static-lod/aimp-interior
|
200m | Range at which to display the model interior (when the model has a mesh defined as being the interior). |
Related content
Wiki articles
- FlightGear configuration via XML. See in particular the section Adding your own settings.
Forum topics
- 3d models, how to produce them in an understandable way topic on the forum
(April 2020-) - Touches on the subject of not using LOD range animations in scenery models.
Source code
- flightgear/fgdata/next/defaults.xml. Do not change this file, rather follow these instructions.
- flightgear/simgear/next/simgear/scene