import hou
 
 
 def merged_visible_geo(visible_nodes, apply_world_transform=False):
     """Merge the geometry of every node in `visible_nodes` into one Geometry.
 
     `visible_nodes` are plain hou.Node SOPs (typically from
     collect_visible_nodes), so the world transform to apply is their parent
     object's.
     """
     geo = hou.Geometry()
 
     for node in visible_nodes:
         node_geo = hou.Geometry()
         node_geo.merge(node.geometry())
 
         if apply_world_transform:
             node_geo.transform(node.parent().worldTransform())
 
         geo.merge(node_geo)
 
     return geo