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François 71adb77a2e
support all types of animation interpolation from gltf (#10755) 
# Objective

- Support step and cubic spline interpolation from gltf

## Solution

- Support step and cubic spline interpolation from gltf

Tested with
https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/InterpolationTest
expected: 

![](https://raw.githubusercontent.com/KhronosGroup/glTF-Sample-Models/master/2.0/InterpolationTest/screenshot/screenshot.gif)
result: 

![output](https://github.com/bevyengine/bevy/assets/8672791/e7f1afd5-20c9-4921-97d4-8d0c82203068)

---

## Migration Guide

When manually specifying an animation `VariableCurve`, the interpolation
type must be specified:

- Bevy 0.12
```rust
        VariableCurve {
            keyframe_timestamps: vec![0.0, 1.0, 2.0, 3.0, 4.0],
            keyframes: Keyframes::Rotation(vec![
                Quat::IDENTITY,
                Quat::from_axis_angle(Vec3::Y, PI / 2.),
                Quat::from_axis_angle(Vec3::Y, PI / 2. * 2.),
                Quat::from_axis_angle(Vec3::Y, PI / 2. * 3.),
                Quat::IDENTITY,
            ]),
        },
```

- Bevy 0.13
```rust
        VariableCurve {
            keyframe_timestamps: vec![0.0, 1.0, 2.0, 3.0, 4.0],
            keyframes: Keyframes::Rotation(vec![
                Quat::IDENTITY,
                Quat::from_axis_angle(Vec3::Y, PI / 2.),
                Quat::from_axis_angle(Vec3::Y, PI / 2. * 2.),
                Quat::from_axis_angle(Vec3::Y, PI / 2. * 3.),
                Quat::IDENTITY,
            ]),
            interpolation: Interpolation::Linear,
        },
```
2023-12-31 18:01:50 +00:00
..
lib.rs support all types of animation interpolation from gltf (#10755) 2023-12-31 18:01:50 +00:00