Set the shape of the node.

        Shape must be a list containing x,y,z coords as numbers
        to represent the shape of the node.

def setShape(self, shape):
        """Set the shape of the node.

        Shape must be a list containing x,y,z coords as numbers
        to represent the shape of the node.
        """
        for pp in shape:
            if len(pp) != 3:
                raise ValueError('shape point must consist of x,y,z')
        self._shape3D = shape
        self._shape = [(x, y) for x, y, z in shape]