# Multiple mlab scene models example

> Example showing a dialog with multiple embedded scenes.

When using several embedded scenes with mlab, you should be very careful always to pass the scene you want to use for plotting to the mlab function used, elsewhere it uses the current scene. In this example, failing to do so would result in only one scene being used, the last one created.

The trick is to use the ‘mayavi_scene’ attribute of the MlabSceneModel, and pass it as a keyword argument to the mlab functions.

For more examples on embedding mlab scenes in dialog, see also: the examples Mlab interactive dialog example, and Lorenz ui example, as well as the section of the user manual Embedding a Mayavi scene in a Traits dialog.

Python source code: `multiple_mlab_scene_models.py`

    import numpy as np

    from traits.api import HasTraits, Instance, Button, \
        on_trait_change
    from traitsui.api import View, Item, HSplit, Group

    from mayavi import mlab
    from mayavi.core.ui.api import MlabSceneModel, SceneEditor

    class MyDialog(HasTraits):

        scene1 = Instance(MlabSceneModel, ())
        scene2 = Instance(MlabSceneModel, ())

        button1 = Button('Redraw')
        button2 = Button('Redraw')

        @on_trait_change('button1')
        def redraw_scene1(self):
            self.redraw_scene(self.scene1)

        @on_trait_change('button2')
        def redraw_scene2(self):
            self.redraw_scene(self.scene2)

        def redraw_scene(self, scene):
            # Notice how each mlab call points explicitely to the figure it
            # applies to.
            mlab.clf(figure=scene.mayavi_scene)
            x, y, z, s = np.random.random((4, 100))
            mlab.points3d(x, y, z, s, figure=scene.mayavi_scene)

        # The layout of the dialog created
        view = View(HSplit(
                      Group(
                           Item('scene1',
                                editor=SceneEditor(), height=250,
                                width=300),
                           'button1',
                           show_labels=False,
                      ),
                      Group(
                           Item('scene2',
                                editor=SceneEditor(), height=250,
                                width=300, show_label=False),
                           'button2',
                           show_labels=False,
                      ),
                    ),
                    resizable=True,
                    )

    m = MyDialog()
    m.configure_traits()