mesh.primitive.schema.json

{
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "$id": "mesh.primitive.schema.json",
    "title": "Mesh Primitive",
    "type": "object",
    "description": "Geometry to be rendered with the given material.",
    "allOf": [ { "$ref": "glTFProperty.schema.json" } ],
    "properties": {
        "attributes": {
            "type": "object",
            "description": "A plain JSON object, where each key corresponds to a mesh attribute semantic and each value is the index of the accessor containing attribute's data.",
            "minProperties": 1,
            "additionalProperties": {
                "$ref": "glTFid.schema.json"
            }
        },
        "indices": {
            "allOf": [ { "$ref": "glTFid.schema.json" } ],
            "description": "The index of the accessor that contains the vertex indices.",
            "gltf_detailedDescription": "The index of the accessor that contains the vertex indices.  When this is undefined, the primitive defines non-indexed geometry.  When defined, the accessor **MUST** have `SCALAR` type and an unsigned integer component type.",
            "gltf_webgl": "`drawElements()` when defined and `drawArrays()` otherwise."
        },
        "material": {
            "allOf": [ { "$ref": "glTFid.schema.json" } ],
            "description": "The index of the material to apply to this primitive when rendering."
        },
        "mode": {
            "description": "The topology type of primitives to render.",
            "default": 4,
            "anyOf": [
                {
                    "const": 0,
                    "description": "POINTS",
                    "type": "integer"
                },
                {
                    "const": 1,
                    "description": "LINES",
                    "type": "integer"
                },
                {
                    "const": 2,
                    "description": "LINE_LOOP",
                    "type": "integer"
                },
                {
                    "const": 3,
                    "description": "LINE_STRIP",
                    "type": "integer"
                },
                {
                    "const": 4,
                    "description": "TRIANGLES",
                    "type": "integer"
                },
                {
                    "const": 5,
                    "description": "TRIANGLE_STRIP",
                    "type": "integer"
                },
                {
                    "const": 6,
                    "description": "TRIANGLE_FAN",
                    "type": "integer"
                },
                {
                    "type": "integer"
                }
            ]
        },
        "targets": {
            "type": "array",
            "description": "An array of morph targets.",
            "items": {
                "type": "object",
                "minProperties": 1,
                "additionalProperties": {
                    "$ref": "glTFid.schema.json"
                },
                "description": "A plain JSON 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" ]
}