The values in the `ground` heightmap are incorrect when loading a DTM from a `GeoTIFF` file.

[naulan-chrzaszcz]

(I haven't tested the generator's behavior with DTMs from other sources.)

DTM used :

• https://portal.opentopography.org/rasterOutput?jobId=rt1781722584650&metadata=1
• https://ot-data2.sdsc.edu/appRasterSelectService17817225852951969319222/rasters_GEDTM30.tar.gz

**Parametrage 1 utilisé : **

format: minetest

worldName: Parc - Albania
verticalScale: 1.0
horizontalScale: 1.0
area:
  center:
    latitude: 42.067834
    longitude: 19.513717
  extentX: 250
  extentY: 250

crs: EPSG:6870
heightmaps:
  ground:
    default: 0
  water:
    default: 0

forEachTile:
  altitude:
    type: sequence
    do:
    - type: fetchData
      modelType: altitude
      provider:
        type: geotiff
        filePath: data/dtm.tif
    - type: populateHeightmap
      models:
        type: altitude
      heightmap: ground
    - type: setSpawn
      heightmap:
        sum: [ground, 1]
      x: 0
      y: 0
    - type: renderHeightmap
      at: ground
      place:
        structure:
          - put: *voxel-grass
            at: [0, 0, 0]
          - put: *voxel-dirt
            at: [0, 0, -3..-1]
          - put: *voxel-stone
            at: [0, 0, -20..-4]

Generation result :

**In this screenshot, you can see that the heightmap does not reach its expected limits : **

[pyrollo]

I think we should start making our issues in English now (project will be released in August)

[pyrollo]

Please provide a minimal reproducible example (or at least a working example).

(tip: parameter.xml file is much reliable than partial file you sent)

[indyteo]

Second tip:
You can create foldable section in GitHub Markdown using the <details> HTML tag:

<details>
<summary>This is shown as the title of the foldable section</summary>

This is the (possibly extra long) content that is only displayed if the user clicked on the text to expand it!

Lorem ipsum...
</details>

This is shown as the title of the foldable section

This is the (possibly extra long) content that is only displayed if the user clicked on the text to expand it!

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This works particularly well to show long files (but don't forget to add a blank line after <summary>...</summary> otherwise the ``` code block may not render properly)

Example 1 - parameters.yaml

worldName: Parc - Albania
verticalScale: 1.0
horizontalScale: 1.0
area:
  center:
    latitude: 42.067834
    longitude: 19.513717
  extentX: 250
  extentY: 250

crs: EPSG:6870
heightmaps:
  ground:
    default: 0
  water:
    default: 0

forEachTile:
  altitude:
    type: sequence
    do:
    - type: fetchData
      modelType: altitude
      provider:
        type: geotiff
        filePath: data/dtm.tif
    - type: populateHeightmap
      models:
        type: altitude
      heightmap: ground
    - type: setSpawn
      heightmap:
        sum: [ground, 1]
      x: 0
      y: 0
    - type: renderHeightmap
      at: ground
      place:
        structure:
          - put: *voxel-grass
            at: [0, 0, 0]
          - put: *voxel-dirt
            at: [0, 0, -3..-1]
          - put: *voxel-stone
            at: [0, 0, -20..-4]

  roads:
    after: altitude
    type: sequence
    do:
      #- type: fetchData
      #  modelType: roads
      #  provider:
      #    type: shapefile
      #    filePath: data/infra_total.shp
      - type: fetchData
        modelType: roads
        provider:
          type: shapefile
          filePath: "data/Transporti Rrugor/LinjeRrugor.shp"
      - type: renderLines2d
        models:
          type: roads
        heightmap: ground
        structure:
          axes: [ y ]
          blueprint:
            "██████"
          with:
            "█": default:stone
  
  bridge:
    after: altitude
    type: noOperation
    # idk how i can do that for now, missing tasks for.

  footway:
    after: altitude
    type: sequence
    do:
      - type: fetchData
        modelType: footways
        provider:
          type: overpass
          url: https://overpass-api.de/api/interpreter
          query: nwr[highway=footway]
        retry: 3
      - type: renderLines2d
        models:
          type: footways
        heightmap: ground
        structure:
          axes: [ y ]
          blueprint:
            "██"
          with:
            "█": default:sandstone

  buildings:
    after: altitude
    type: sequence
    do:
      - type: fetchData
        modelType: buildings
        provider:
          type: overpass
          url: https://overpass-api.de/api/interpreter
          query: nwr[building]
        retry: 3
      - type: computeHeightmapStats
        models:
          type: buildings
        heightmap: ground
        compute:
          minimum: minimum-ground-altitude
          maximum: ground-floor-altitude
      - type: fillBetweenHeightmapAndMetadata
        models:
          type: buildings
        heightmap: ground
        altitudeMetadata: ground-floor-altitude
        placeAbove: default:air
        placeBelow: wool:orange
      - type: renderSurfaces
        models:
          type: buildings
        heightmap: ground
        place: wool:orange

  water:
    after: altitude
    type: sequence
    do:
      - type: fetchData
        modelType: water
        provider:
          type: shapefile
          filePath: data/III_Rrjedhe_ujore/III_Rrjedhe_ujore.shp
      - type: copyHeightmap
        models:
          type: water
        from:
          localMin: ground
          range: 9
        to: ground
      - type: copyHeightmap
        models:
          type: water
        from: 1
        to: water
      - type: copyHeightmap
        models:
          type: water
        from:
          remap:
            manhattan: water
            maximumDistance: 12
            targetValue: 0
          mapping:
            0: 0
            1: 1
            2: 8
            3..3: 10
            4..6: 11
            7..12: 12
        to: water
      - type: renderHeightmap
        minimum:
          sum:
            - ground
            - 1
            - product: [ -1, water ]
        maximum: ground
        place:
          structure:
            - put: *voxel-water
              at: [ 0, 0, 0 ]
            # This a dirt fix to remove vegetation on water
            - put: *voxel-air
              at: [ 0, 0, 1..12 ]

  barrier:
    after: altitude
    type: sequence
    do:
      - type: fetchData
        modelType: barriers
        provider:
          type: overpass
          url: https://overpass-api.de/api/interpreter
          query: nwr[barrier=city_wall]
        retry: 3
      - type: renderLines2d
        models:
          type: barriers
        heightmap: ground
        structure:
          axes: [ y ]
          blueprint:
            "██"
          with:
            "█": wool:grey

  tree:
    after: altitude
    type: sequence
    do:
      - type: fetchData
        modelType: trees
        provider:
          type: overpass
          url: https://overpass-api.de/api/interpreter
          query: nwr[natural=tree]
        retry: 3
      - type: renderSurfaces
        models:
          type: trees
        heightmap: 
          sum: 
            - ground
            - 1
        place: 
          structure:
            - put: wool:green
              at: [ 0, 0, 0..5 ]

PS: I think @pyrollo is referring to parameters.yaml, unless he created a XML version in secret! 😄

[indyteo]

Could you please try on the indy/fix-geotiff branch, to see if this was a shadow bug of #187?
It caused issue with the computed envelope, which defines the limits of the height data, and this might explain your second example (and to some extent, maybe the first one too).
I have good feelings about this one! :)

[naulan-chrzaszcz]

This issue is probably not fixed yet. I'm waiting to finish PR #209 to see if I still have the same problem.