start: ExtrinsicsSampler,
        end: ExtrinsicsSampler,
    },
    Avoidant {
        start: ExtrinsicsSampler,
        end: ExtrinsicsSampler,
        bend_away_from: Vec3,
        radius: f32,
    },
    AvoidantXZ {
        start: ExtrinsicsSampler,
        end: ExtrinsicsSampler,
        bend_away_from: Vec3,
        radius: f32,
    },
    // TODO: formal curve support /w composition
    // TODO: support varying intrinsics across trajectory
}

impl Default for TrajectorySampler {