/// <summary>
/// Clones a <see cref="ModelComponent"/>s <see cref="Material"/> if required;
/// </summary>
/// <param name="modelComponent"></param>
/// <param name="materialIndex"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException">If <paramref name="modelComponent"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentOutOfRangeException">If <paramref name="materialIndex"/> is less than 0 or greater than <see cref="ModelComponent.GetMaterialCount"/> and not in <see cref="ModelComponent.Materials"/>.</exception>
private static Material GetMaterialCopy(this ModelComponent modelComponent, int materialIndex)
{
if (modelComponent == null)
{
throw new ArgumentNullException(nameof(modelComponent));
}
if (!IsValidMaterialIndex(modelComponent, materialIndex))
{
throw new ArgumentOutOfRangeException(nameof(materialIndex));
}
var material = modelComponent.GetMaterial(materialIndex);
if (material is ModelComponentMaterialCopy copy && copy.ModelComponent == modelComponent)
{
return(material);
}
var materialCopy = new ModelComponentMaterialCopy()
{
ModelComponent = modelComponent,
};
MaterialExtensions.CopyProperties(material, materialCopy);
modelComponent.Materials[materialIndex] = materialCopy;
return(materialCopy);
}