Function resolve_sample

perro_source/core/perro_animation/src/panim/tracks.rs:1264–1289

(
    frame: u32,
    prev: Option<(u32, &TrackKey, T)>,
    next: Option<(u32, &TrackKey, T)>,
    lerp: impl Fn(T, T, f32) -> T,
)

        let comp = read(value);
        if *f <= frame {
            prev = Some((*f, key, comp));
        } else {
            next = Some((*f, key, comp));
            break;
        }
    }
    resolve_sample(frame, prev, next, lerp)
}

fn sample_component_3d<T: Copy>(
    snapshot: &[(u32, TrackKey)],
    frame: u32,
    mask: u8,
    read: impl Fn(Transform3D) -> T,
    lerp: impl Fn(T, T, f32) -> T,
) -> Option<T> {
    let mut prev = None::<(u32, &TrackKey, T)>;
    let mut next = None::<(u32, &TrackKey, T)>;
    for (f, key) in snapshot {
        if key.transform3d_mask & mask == 0 {
            continue;
        }
        let AnimationTrackValue::Transform3D(value) = key.value else {
            continue;
        };
        let comp = read(value);
        if *f <= frame {
            prev = Some((*f, key, comp));
        } else {