animation.sampler.schema.json

{
    "$schema": "http://json-schema.org/draft-04/schema",
    "title": "Animation Sampler",
    "type": "object",
    "description": "Combines input and output accessors with an interpolation algorithm to define a keyframe graph (but not its target).",
    "allOf": [ { "$ref": "glTFProperty.schema.json" } ],
    "properties": {
        "input": {
            "allOf": [ { "$ref": "glTFid.schema.json" } ],
            "description": "The index of an accessor containing keyframe input values, e.g., time.",
            "gltf_detailedDescription": "The index of an accessor containing keyframe input values, e.g., time. That accessor must have componentType `FLOAT`. The values represent time in seconds with `time[0] >= 0.0`, and strictly increasing values, i.e., `time[n + 1] > time[n]`."
        },
        "interpolation": {
            "description": "Interpolation algorithm.",
            "default": "LINEAR",
            "gltf_detailedDescription": "Interpolation algorithm.",
            "anyOf": [
                {
                    "enum": [ "LINEAR" ],
                    "description": "The animated values are linearly interpolated between keyframes. When targeting a rotation, spherical linear interpolation (slerp) should be used to interpolate quaternions. The number output of elements must equal the number of input elements."
                },
                {
                    "enum": [ "STEP" ],
                    "description": "The animated values remain constant to the output of the first keyframe, until the next keyframe. The number of output elements must equal the number of input elements."
                },
                {
                    "enum": [ "CUBICSPLINE" ],
                    "description": "The animation's interpolation is computed using a cubic spline with specified tangents. The number of output elements must equal three times the number of input elements. For each input element, the output stores three elements, an in-tangent, a spline vertex, and an out-tangent. There must be at least two keyframes when using this interpolation."
                },
                {
                    "type": "string"
                }
            ]
        },
        "output": {
            "allOf": [ { "$ref": "glTFid.schema.json" } ],
            "description": "The index of an accessor, containing keyframe output values.",
            "gltf_detailedDescription": "The index of an accessor containing keyframe output values. When targeting translation or scale paths, the `accessor.componentType` of the output values must be `FLOAT`. When targeting rotation or morph weights, the `accessor.componentType` of the output values must be `FLOAT` or normalized integer. For weights, each output element stores `SCALAR` values with a count equal to the number of morph targets."
        },
        "extensions": { },
        "extras": { }
    },
    "required": [ "input", "output" ]
}