if from_node.type=='NORMAL_MAP':
from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
invert, _ = check_invert_green(node_tree, from_node)
if from_node.type=='NORMAL_MAP':
from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
invert, _ = check_invert_green(node_tree, from_node)