Highlights:

• Dedicated/LAN Server support
  
• Fading between DH and vanilla rendering
  
• Changed the DH logo
  
• Removed Multiverse Similarity percent
  
• Fixed vertical fog
  
• Up API version 3.0.1 -> 4.0.0
  
• Massively reduced memory requirements and GC stuttering
  
  • DH can now run with as little as 2-4 GB of memory (depending on CPU settings)
    
  • This change does cause initial LOD loading to be slightly slower
    
• Added Dynamic thread allocation
  
• Fixed an EXCEPTION_ACCESS_VIOLATION rendering crash
  

Full Changelog

Additions:

• Server support - pshsh
  
  • Server LOD generation
    
  • Server Multiverse handling
    
  • dedicated servers
    
  • LAN servers
    
• Add DH/Vanilla fading
  
• Add support for N-sized world generation
  
• Add recalculate heightmap config
  
  • for use with world painter worlds or whenever the heightmap is incorrect
    
• Add Oculus 1.7 to the list of incompatible mods
  
  • Oculus needs to update to use the new DH API
    
• Add pshsh to the author list
  
• Add partial mod incompatibily chat warnings
  
  • Chunky, WWOO, and Alex's Caves
    
• Re-added INTERNAL_SERVER distant generator model
  
  • This mode will ask MC's server to generate the chunks.
    
  • This mode allows for more accurate generation at the cost of world size and server thread lag
    
• Add config assumePreExistingChunksAreFinished
  
  • This may help with situations where pre-existing chunks were created by third-party program and are incorrectly running world gen.
    
• Dyanimc Thread allocation - Pshsh and James
  
  • DH now has a single thread count config
    
  • This should reduce the chance of DH using 100% CPU with lower CPU presets
    
  • The CPU preset has also been increased from LOW -> BALANCED
    
• Add options to show/hide some DH F3 screen info
  
  • memory pools are hidden by default since they aren't needed unless debugging said pools is needed
    
• Add logs for when a repo has finished closing
  
  • If Sqlite is taking a long time flushing the WAL file, this should help show that
    
• Add validateBufferIdsBeforeRendering Config
  
  • Enabling this drastically reduces FPS but can be helpful for troubleshooting
    
• Add a chat warning if the vanilla render distance is higher than recommeneded
  
  • DH can be more easily overwhelmed if the vanilla render distance is too high
    
  • And vanilla CPU use is much higher
    
• Add world gen/import progress overlay
  
• Add automatic overdraw config
  
  • when overdraw is set to "0.0" DH will determine the best overdraw based on the vanilla render distance
    
  • this also affects vanilla fading and will make the vanilla render distance appear a bit further when fading is enabled
    
• Add the ability to change beacon beam heights - zJannyAT
  

Improvements:

• Optimize ChunkWrapper getBlockState - Builderb0y
  
• Optimize sky light for LODs - Builderb0y
  
• Improve adjacent chunk lighting logic - CreepermeYT
  
• Reduce file handler task count when updating QuadTree nodes
  
• LOD updates will happen around the player instead of FIFO
  
• Optimize DH cloud rendering
  
  • Cull behind the camera
    
  • Change cloud model to smooth transition
    
  • Slightly increase cloud speed
    
• Improve generic object render profiling
  
• Cache arrays used during Generic Object Rendering
  
• Move some LOD Building logic off of the render thread
  
• Improve Buffer upload speed and remove buffer upload threadpool
  
  • Buffer uploading is now handled on the Lod Builder threadpool
    
• Rewrote object pooling to massively reduce memory use and generated garbage
  
  • DH can now run with as little as 2 GB of ram (depending on CPU load) and in MC 1.21.4 memory per second with world gen was between 500 MB and 1 GB per second, in comparison to 6 GB/s previously
    
• Reduce garbage generated when interacting with Sqlite
  
• Added number formatting to migration progress logs
  
• Reduce duplicate warnings when loading old worlds
  

Changes:

• Changed the Logos
  
  • new logos created by Pankakes
    
• Hide "Distant Horizons Overloaded" chat message
  
  • message can be enabled via config for testing
    
• Vertical quality dropoff is slower
  
• Split the config into: Client, Common, Server
  
• Increase far clip plane distance slightly
  
• Increase default render distance 128 -> 256
  
• Added brown mushrooms to the list of ignored blocks
  
  • fixes some swamp rendering issues
    
• Removed world gen timeout
  
  • It was originally added to prevent locking up world gen threads that got stuck in an infinite loop, however it never solved that problem so it was just an annoyance.
    
• Rename world gen thread pool in F3 screen "World Gen" -> "World Gen/Pull Chunk"
  
  • This thread pool has always handled both pulling pre-existing chunks and generating missing chunks, however there was some confusion where some people thought it only generated chunks
    
• Increase Default thread preset LOW -> BALANCED
  
  • due to the addition of dynamic thread allocation the number used for each prest was changed slightly
    
• Change CPU Preset config default values
  

Bug Fixes:

• Hide closed database warnings
  
• Fix some instances of extremely high file handler job counts
  
• Fix config file handler corruption due to concurrent reading/writing
  
• Fix F3 menu showing the same level multiple times
  
• Fix the near clip plane appearing when zooming
  
• Fix JOptionPane causing Mac's with other mods freezing during load
  
• Fix generic renderer not using material type for shader use
  
• Fix a few logs not showing positions correctly
  
• Fix unnecessary JarUtil error logging
  
• Fix GLProxy skipping some render thread tasks
  
  • This may solve some memory leaks or rendering holes
    
• Fix height fog
  
• Fix crashing when other mods null the MVM or Projection matricies
  
• Fix crashing when setting some config values to 0
  
• Fix pack.mcmeta warnings
  
• Fix DH preventing server shutdown in some cases
  
• Fix an EXCEPTION_ACCESS_VIOLATION rendering crash
  
• Fix Sqlite memory leaks
  
• Fix infinitely growing memory when changing dimensions
  
• Fix auto updater failing in some cases and improve logging
  
• Fix rare concurrent modification when changing generic rendering cubes
  
• Fix beacons disappearing in some situations
  
• Fix stairs, slabs, and glass sometimes not appearing in LODs
  
• Relocate Sqlite under a DH namespace to prevent interference with other mods shading or adding SQLite - pshsh
  
• Fix rare concurrency error on world gen shutdown
  

Removals:

• Multiverse similarity percent
  
  • Levels will now use the hashed seed in their folder name instead
    
  • This is a significantly more relyable method for differentiating levels.
    

API Changes

Highlights:

• Up API version 3.0.1 -> 4.0.0
  

Full Changelog

Additions:

• IDhApiWorldProxy
  
  • setReadOnly()
    
  • getReadOnly()
    
• IDhApiLevelWrapper
  
  • getDimensionName()
    
  • getDhIdentifier()
    
  • getDhSaveFolder()
    
• generateLod()
  
  • Can be used to generate N-sized LODs
    
• IDhApiFogConfig
  
  • enableDhFog()
    
  • enableVanillaFog()
    
• EDhApiWorldGeneratorReturnType
  
  • API_DATA_SOURCES
    
• IDhApiFullDataSource
  
  • For use with the IDhApiWorldGenerator
    
• DhApiWorldUnloadEvent
  
• DhApiWorldLoadEvent
  
• IDhApiSaveStructure
  
• EDhApiDistantGeneratorMode
  
  • FULL
    

Changes:

• Up API version 3.0.1 -> 4.0.0
  
• IDhApiWorldGenerator
  
  • rename runApiChunkValidation() -> runApiValidation()
    
• IDhApiHeightFogConfig
  
  • heightFogMode -> heightFogDirection
    
• EDhApiHeightFogMode -> EDhApiHeightFogDirection
  
• EDhApiHeightFogMixMode
  
  • BASIC -> SPHERICAL
    
  • IGNORE_HEIGHT -> CYLINDRICAL
    

Bug Fixes:

• Fix off by one error in the following IDhApiTerrainDataRepo methods when getting blocks in negative X and/or Z positions:
  
  • getSingleDataPointAtBlockPos()
    
  • getColumnDataAtBlockPos()
    
  • getAllTerrainDataAtChunkPos()
    
  • getAllTerrainDataAtRegionPos()
    
  • getAllTerrainDataAtDetailLevelAndPos()
    

Removals:

• IDhApiDimensionTypeWrapper
  
  • getDimensionName()
    
• IDhApiWorldGenerator
  
  • getMinGenerationGranularity()
    
  • getMaxGenerationGranularity()
    
  • isBusy()
    
  • generateChunks() and generateApiChunks() byte granularity parameter
    
    • int generationRequestChunkWidthCount is it's replacement and represents a different thing. Having the number of chunks wide is much easier to understand than the granularity.
      
• IDhApiMultiplayerConfig
  
  • multiverseSimilarityRequirement()
    
    • This config is no longer supported or needed
      

Deprecations:

• IDhApiFogConfig
  
  • drawMode()
    
    • Use enableDhFog() instead
      
    • The old method is kept but deprecated to prevent breaking support with Iris 1.7.5
      
  • disableVanillaFog()
    
    • Use enableVanillaFog() instead
      
    • The old method is kept but deprecated to prevent breaking support with Iris 1.7.5
      
• EDhApiFogDrawMode
  
  • USE_OPTIFINE_SETTING