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use gltf_derive::Validate;
use serde_derive::{Serialize, Deserialize};
use crate::{accessor, extensions, scene, Extras, Index};
/// Joints and matrices defining a skin.
#[derive(Clone, Debug, Deserialize, Serialize, Validate)]
pub struct Skin {
/// Extension specific data.
#[serde(default, skip_serializing_if = "Option::is_none")]
pub extensions: Option<extensions::skin::Skin>,
/// Optional application specific data.
#[serde(default)]
#[cfg_attr(feature = "extras", serde(skip_serializing_if = "Option::is_none"))]
pub extras: Extras,
/// The index of the accessor containing the 4x4 inverse-bind matrices.
///
/// When `None`,each matrix is assumed to be the 4x4 identity matrix
/// which implies that the inverse-bind matrices were pre-applied.
#[serde(rename = "inverseBindMatrices")]
#[serde(skip_serializing_if = "Option::is_none")]
pub inverse_bind_matrices: Option<Index<accessor::Accessor>>,
/// Indices of skeleton nodes used as joints in this skin.
///
/// The array length must be the same as the `count` property of the
/// `inverse_bind_matrices` `Accessor` (when defined).
#[serde(skip_serializing_if = "Vec::is_empty")]
pub joints: Vec<Index<scene::Node>>,
/// Optional user-defined name for this object.
#[cfg(feature = "names")]
#[cfg_attr(feature = "names", serde(skip_serializing_if = "Option::is_none"))]
pub name: Option<String>,
/// The index of the node used as a skeleton root.
///
/// When `None`, joints transforms resolve to scene root.
#[serde(skip_serializing_if = "Option::is_none")]
pub skeleton: Option<Index<scene::Node>>,
}