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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def convex_hull(self):
 """ The convex hull of the whole scene Returns --------- hull: Trimesh object, convex hull of all meshes in scene """

        points = util.vstack_empty([m.vertices for m in self.dump()])
        hull = convex.convex_hull(points)
        return hull