Terrain export with Remodel

[Abok_d]

I’m in the process of moving my project to be ‘fully managed’ with Rojo before I continue working on it, but having an odd issue with my terrain export using Remodel.

This is my current script for the terrain export

local EMPTY_TERRAIN = "AQU="

local placeId=<redacted>
local place = remodel.readPlaceAsset(placeId)
local mapInstance = Instance.new("Model")

-- get terrain data
local function GetSmoothGrid(place)
    local smoothGrid
    smoothGrid = remodel.getRawProperty(place.Workspace.Terrain, "SmoothGrid")
    return smoothGrid
end

-- create a terrain object
local function CreateTerrainObject(smoothGrid,mapInstance)
    if smoothGrid == EMPTY_TERRAIN then
        print("No terrain.")
    else
        print("Creating terrain object...")
        local terrainRegion = Instance.new("TerrainRegion")
        remodel.setRawProperty(
            terrainRegion,
            "ExtentsMax",
            "Vector3int16",
            Vector3int16.new(32000,32000,32000)
        )
        remodel.setRawProperty(
            terrainRegion,  
            "ExtentsMin",
            "Vector3int16",
            Vector3int16.new(-32000,-32000,-32000)
        )
        remodel.setRawProperty(
            terrainRegion,
            "SmoothGrid",
            "BinaryString",
            smoothGrid
        )
        print("map instance: ",mapInstance)
        terrainRegion.Parent = mapInstance
    end
end

-- write terrain object/model to file
local function TerrainToFile()
    print("Writing map model file")
    remodel.writeModelFile(mapInstance, "myTerrain.rbxm")
end

-- drive creation
local function WriteTerrain(place,mapInstance)
    local smoothGrid = GetSmoothGrid(place)
    CreateTerrainObject(smoothGrid,mapInstance)
    TerrainToFile()
end

WriteTerrain(place,mapInstance)

The terrain exports is written to a model OK and Rojo project builds without issue.

The terrain, however, show the issues (SizeInCells: 1,1,1):

If I export it to an .rbxmx file, I can see that the ExtentsMax and ExtentsMin properties are not what I expect:

Manually change the two properties in the xml manually:

Change the Rojo project file to use the saved .rbxmx terrain file:

The data in SizeInCells is now what I expect it to be:

From there I can paste the terrain (with workspace.Terrain:PasteRegion() ) without issue.

How can I get this export to work with Vectory3Int16 values for ExtentsMax and ExtentsMin properties intact?

[Abok_d]

Writing the model out as xml (.rbxmx), rather than a binary file (.rbxm) solves my issue, though the binary format is preferable.