HeightmapTerrainData not upsampling as expected

[slozier]

I've been using HeightmapTerrainData to flattern out certain bumpy regions and using 1.22, the geometry that was positioned over the flattened region isn't properly positioned (altitude) anymore.

I'm wondering why upsample of HeightmapTerrainData changed to only upsample to integer values? Maybe I'm misunderstanding something...

I tracked it down to the following commit #3966

Here's some sample code:

var tilingScheme = new Cesium.GeographicTilingScheme();
var rect = new Cesium.Rectangle(0, 0, 0.1, 0.1);
var height = 1.8;

// a flat piece of terrain
var data = new Cesium.HeightmapTerrainData({
    buffer : new Float32Array([height, height, height, height]),
    width : 2,
    height : 2
});

var mesh = data.createMesh(tilingScheme, 0, 0, 0, 1).then(function() {
    return data.upsample(tilingScheme, 0, 0, 0, 0, 0, 1);
}).then(function(upsampled) {
    // expecting the value of height but only getting the integer part
    console.log(upsampled.interpolateHeight(rect, 0, 0));
});

[xtassin]

Sorry to trash/bump a closed issue but I really would like to contact the original poster, slozier, about terrain mesh manipulation. Thanks. xtassin[at]gmail.com