static void GetAttributeValue ( struct [UE::Anim::FStackAttributeContainer](API\Runtime\Engine\Animation\FStackAttributeContainer) & OutAttributes, const struct [FCompactPoseBoneIndex](API\Runtime\AnimationCore\FCompactPoseBoneIndex) & PoseBoneIndex, const struct [FCustomAttribute](API\Runtime\Engine\Animation\FCustomAttribute) & Attribute, const struct [FAnimExtractContext](API\Runtime\Engine\Animation\FAnimExtractContext) & ExtractionContext )