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OutOfMemoryError when dealing with a large batch of files #26

Description

@GiovanniSabatini

Tried running the conversion with 1.13.4-release,

tried allocating 16Go of RAM to Java heap size (the program always prompted me with :[RefineMesh-Start] CRITICAL memory pressure: 0.2% free (36MB / 16GB). Recommend stopping to prevent OutOfMemoryError.
[RefineMesh] CRITICAL memory pressure BEFORE refinement starts: free=0.2%. Cannot proceed. Increase heap size (-Xmx).
),

tried tweaking --continue, --rasterMaxSize and --mosaicSize but i would always get the following error :

An unexpected error occurred.
java.lang.OutOfMemoryError: Java heap space
at java.lang.Integer.valueOf(Integer.java:1083) ~[?:?]
at com.gaia3d.terrain.structure.TerrainMesh.loadDataInputStream(TerrainMesh.java:1288) ~[mago-3d-terrainer-1.13.4-release.jar:1.13.4-release]
at com.gaia3d.terrain.tile.TileWgs84.loadFile(TileWgs84.java:83) ~[mago-3d-terrainer-1.13.4-release.jar:1.13.4-release]
at com.gaia3d.terrain.tile.TileWgs84Manager.loadTileWgs84(TileWgs84Manager.java:1182) ~[mago-3d-terrainer-1.13.4-release.jar:1.13.4-release]
at com.gaia3d.terrain.tile.TileMatrix.makeMatrixMesh(TileMatrix.java:572) ~[mago-3d-terrainer-1.13.4-release.jar:1.13.4-release]
at com.gaia3d.terrain.tile.TileWgs84Manager.makeTileMeshesContinueCustom(TileWgs84Manager.java:761) ~[mago-3d-terrainer-1.13.4-release.jar:1.13.4-release]
at com.gaia3d.command.Mago3DTerrainerMain.executeCustomTree(Mago3DTerrainerMain.java:159) ~[mago-3d-terrainer-1.13.4-release.jar:1.13.4-release]
at com.gaia3d.command.Mago3DTerrainerMain.main(Mago3DTerrainerMain.java:73) [mago-3d-terrainer-1.13.4-release.jar:1.13.4-release]
Exception in thread "main" java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
at com.gaia3d.command.Mago3DTerrainerMain.main(Mago3DTerrainerMain.java:93)
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.base/java.lang.Integer.valueOf(Integer.java:1083)
at com.gaia3d.terrain.structure.TerrainMesh.loadDataInputStream(TerrainMesh.java:1288)
at com.gaia3d.terrain.tile.TileWgs84.loadFile(TileWgs84.java:83)
at com.gaia3d.terrain.tile.TileWgs84Manager.loadTileWgs84(TileWgs84Manager.java:1182)
at com.gaia3d.terrain.tile.TileMatrix.makeMatrixMesh(TileMatrix.java:572)
at com.gaia3d.terrain.tile.TileWgs84Manager.makeTileMeshesContinueCustom(TileWgs84Manager.java:761)
at com.gaia3d.command.Mago3DTerrainerMain.executeCustomTree(Mago3DTerrainerMain.java:159)
at com.gaia3d.command.Mago3DTerrainerMain.main(Mago3DTerrainerMain.java:73)

Le traitement a echoue avec le code de retour : 1

On this precise batch of files, I've got 618 .tif files of 36 Mo each. On the various tests I've done, no one has ever gone as far as the one with the 1.13.4-release file instead of 1.13.0 (stopped at LOD 18, near the really end), tough it still crashed before finishing.

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