Varregion

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Varregion

Contents

"Varregion" is a feature of OpenSimulator that enables region sizes larger than 256x256. The region is just larger so it acts like a regular region but with borders farther apart.

Restrictions

Some restrictions apply:

  • The dimensions must a multiple of 256
  • The dimensions must be square if used with Singularity (as of 20131104)
  • There must be no adjacent regions (at least one empty 256m space bordering all sides of the large region)
  • You must use BulletSim (as of 20131104, ODE has not been modified for varregions)

Configuration

Varregions and OAR Files

Things Known to be Broken

  • Rezzing a prim from inventory at greater than <256,256>
  • Saving/restoring heightmap when restarting region
    • Start large region, edit large part, restart region, see that edits are not saved

Implementation Notes

What follows are notes I am making as things that might need work are found in OpenSimulator.

  • ITerrainLoader implementations
    • How to handle tiles.
    • How to handle large regions sizes.
    • Terrain/FileLoaders/*.cs all return an ITerrainChannel
    • Need to fix all the file reader/writers
    • FileLoaders/LLRAW.cs has several "256"s rather than constant references
  • Consider moving terrain XML serialization into TerrainData
  • Consider removing all instances of TerrainChannel.GetFloatsSerialized()
    • Replace with passing around TerrainData
  • Code in EntityTransferModule that checks distance to decide of to make new connection
    • search for references to 'Constants.RegionSize'
    • Consider removing the distance code and replacing with call to grid service
  • WorldMapModule.cs does a lot of arithmetic depending on constants that are really Contants.RegionSize
  • Util.IsOutsideView uses Constants.RegionSize. Is use is ScenePresence a problem?
    • Used in ScenePresence.AdjustKnownSeeds()
    • Is this another instance like EntityTransferModule that needs to goto the grid service?
  • Move all the short[] heightmap representation stuff into TerrainData.cs (partially done)
    • Is it possible to move all the patch stuff out of TerrainModule/TerrainChannel?
    • Clean up the use of m_revert. It looks like it is not saved after terrain is modified.
  • Need to look through RegionCombinerModule.cs and see what safety checks are needed
    • Maybe just prevent combination if not legacy region size
  • In LSL_Api.cs, llEdgeOfWorld() does some neighbor computation. Check for ok'ness.
  • Blog entry on moving terrain info into class
    • Moving class from OpenSim.Region.Framework into OpenSim.Framework
  • The code for cloud and wind needs to be enhanced for larger regions
    • New layer types added
  • Ward3DMap/TerrainSplat.cs is filled with "256"s.
    • Doesn't even bother to use the symbolic constants.
  • Warp3DMap/Warp3DImageModule.cs is filled with "256"s
  • WorldMap/WorldMapModules.cs is filled with "256"S
  • Services/MapImageService/MapImageService.cs relies on a constant width of 256
  • Region/Framework/Scenes/Tests/BorderTests.cs might need work if non-standard regions are tested
  • Verify terrain tests still work (for 256m regions)
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