/// <summary>
/// Loads the variant sets and selection state from USD into the UsdVariantSet behaviour.
/// </summary>
public void LoadFromUsd(pxr.UsdPrim prim)
{
var variantSets = prim.GetVariantSets();
var setNames = variantSets.GetNames();
m_variantSetNames = setNames.ToArray();
m_selected = m_variantSetNames.Select(setName => variantSets.GetVariantSelection(setName)).ToArray();
m_variants = m_variantSetNames.SelectMany(setName => variantSets.GetVariantSet(setName).GetVariantNames()).ToArray();
m_variantCounts = m_variantSetNames.Select(setName => variantSets.GetVariantSet(setName).GetVariantNames().Count).ToArray();
m_primPath = prim.GetPath();
}