Is there any deferences between `defaultGeometrySchema` & `geometryDefinition` ?

[onsummer]

They look similar, seem to be a description of binary geometric data's structure, but what the differences ?

I know that node.mesh.geometry.definition use geometryDefinition by referring geometryDefinition's index, but I'd like to know where defaultGeometrySchema is used.

eg. :

"defaultGeometrySchema": {
    "header": [
        {
            "property": "vertexCount",
            "type": "UInt32"
        },
        {
            "property": "featureCount",
            "type": "UInt32"
        }
    ],
    "topology": "PerAttributeArray",
    "ordering": [
        "position",
        "normal",
        "uv0",
        "color",
        "region"
    ],
    "vertexAttributes": {
        "position": {
            "valueType": "Float32",
            "valuesPerElement": 3
        },
        "normal": {
            "valueType": "Float32",
            "valuesPerElement": 3
        },
        "uv0": {
            "valueType": "Float32",
            "valuesPerElement": 2
        },
        "color": {
            "valueType": "UInt8",
            "valuesPerElement": 4
        },
        "region": {
            "valueType": "UInt16",
            "valuesPerElement": 4
        }
    },
    "featureAttributeOrder": [
        "id",
        "faceRange"
    ],
    "featureAttributes": {
        "id": {
            "valueType": "UInt64",
            "valuesPerElement": 1
        },
        "faceRange": {
            "valueType": "UInt32",
            "valuesPerElement": 2
        }
    }
}

A geometryDefinition object:

{
    "geometryBuffers": [
        {
            "offset": 8,
            "position": {
                "type": "Float32",
                "component": 3
            },
            "normal": {
                "type": "Float32",
                "component": 3
            },
            "uv0": {
                "type": "Float32",
                "component": 2
            },
            "color": {
                "type": "UInt8",
                "component": 4
            },
            "featureId": {
                "type": "UInt64",
                "component": 1,
                "binding": "per-feature"
            },
            "faceRange": {
                "type": "UInt32",
                "component": 2,
                "binding": "per-feature"
            }
        },
        {
            "compressedAttributes": {
                "encoding": "draco",
                "attributes": [
                    "position",
                    "uv0",
                    "color",
                    "feature-index"
                ]
            }
        }
    ]
}

tks.

[rvargasESRI]

@onsummer The defaultGeometrySchema is used for legacy purposes and backwards compatibility for I3S 1.6 and older. It is used in the uncompressed geometryBuffer.