mesh.primitive.schema.json

{
    "$schema": "http://json-schema.org/draft-04/schema",
    "title": "Mesh Primitive",
    "type": "object",
    "description": "Geometry to be rendered with the given material.",
    "allOf": [ { "$ref": "glTFProperty.schema.json" } ],
    "properties": {
        "attributes": {
            "type": "object",
            "description": "A dictionary object, where each key corresponds to mesh attribute semantic and each value is the index of the accessor containing attribute's data.",
            "minProperties": 1,
            "additionalProperties": {
                "$ref": "glTFid.schema.json"
            }
        },
        "indices": {
            "allOf": [ { "$ref": "glTFid.schema.json" } ],
            "description": "The index of the accessor that contains the indices.",
            "gltf_detailedDescription": "The index of the accessor that contains mesh indices.  When this is not defined, the primitives should be rendered without indices using `drawArrays()`.  When defined, the accessor must contain indices: the `bufferView` referenced by the accessor should have a `target` equal to 34963 (ELEMENT_ARRAY_BUFFER); `componentType` must be 5121 (UNSIGNED_BYTE), 5123 (UNSIGNED_SHORT) or 5125 (UNSIGNED_INT), the latter may require enabling additional hardware support; `type` must be `\"SCALAR\"`. For triangle primitives, the front face has a counter-clockwise (CCW) winding order."
        },
        "material": {
            "allOf": [ { "$ref": "glTFid.schema.json" } ],
            "description": "The index of the material to apply to this primitive when rendering."
        },
        "mode": {
            "description": "The type of primitives to render.",
            "default": 4,
            "gltf_detailedDescription": "The type of primitives to render. All valid values correspond to WebGL enums.",
            "anyOf": [
                {
                    "enum": [ 0 ],
                    "description": "POINTS"
                },
                {
                    "enum": [ 1 ],
                    "description": "LINES"
                },
                {
                    "enum": [ 2 ],
                    "description": "LINE_LOOP"
                },
                {
                    "enum": [ 3 ],
                    "description": "LINE_STRIP"
                },
                {
                    "enum": [ 4 ],
                    "description": "TRIANGLES"
                },
                {
                    "enum": [ 5 ],
                    "description": "TRIANGLE_STRIP"
                },
                {
                    "enum": [ 6 ],
                    "description": "TRIANGLE_FAN"
                },
                {
                    "type": "integer"
                }
            ]
        },
        "targets": {
            "type": "array",
            "description": "An array of Morph Targets, each  Morph Target is a dictionary mapping attributes (only `POSITION`, `NORMAL`, and `TANGENT` supported) to their deviations in the Morph Target.",
            "items": {
                "type": "object",
                "minProperties": 1,
                "additionalProperties": {
                    "$ref": "glTFid.schema.json"
                },
                "description": "A dictionary object specifying attributes displacements in a Morph Target, where each key corresponds to one of the three supported attribute semantic (`POSITION`, `NORMAL`, or `TANGENT`) and each value is the index of the accessor containing the attribute displacements' data."
            },
            "minItems": 1
        },
        "extensions": { },
        "extras": { }
    },
    "gltf_webgl": "`drawElements()` and `drawArrays()`",
    "required": [ "attributes" ]
}