shader1, _ = get_linked_node_and_socket(node_tree, node.inputs[1])
shader2, _ = get_linked_node_and_socket(node_tree, node.inputs[2])
if shader1.type=='BSDF_TRANSPARENT' and shader2.type=='EMISSION':
shader1, _ = get_linked_node_and_socket(node_tree, node.inputs[1])
shader2, _ = get_linked_node_and_socket(node_tree, node.inputs[2])
if shader1.type=='BSDF_TRANSPARENT' and shader2.type=='EMISSION':