In this webinar, Didrik Pinte provides an introduction to MayaVi, the 3D interactive visualization library for the open source Enthought Tool Suite. These tools provide scientists and engineers a sophisticated Python development framework for analysis and visualization.

3. Enthought Tool Suite

4. Mayavi user interface

8. Mayavi “API” or scripting with mlab # Create the data. from numpy import pi, sin, cos, mgrid dphi, dtheta = pi/250.0, pi/250.0 [phi,theta] = mgrid[0:pi+dphi*1.5:dphi,0:2*pi+dtheta*1.5:dtheta] m0 = 4; m1 = 3; m2 = 2; m3 = 3; m4 = 6; m5 = 2; m6 = 6; m7 = 4; r = sin(m0*phi)**m1 + cos(m2*phi)**m3 + sin(m4*theta)**m5 + cos(m6*theta)**m7 x = r*sin(phi)*cos(theta) y = r*cos(phi) z = r*sin(phi)*sin(theta) # View it. from enthought.mayavi import mlab s = mlab.mesh(x, y, z) mlab.show()

9. Running mlab within ipython C:ipython –wthread >>> from enthought.mayavi import mlab matplotlib also has an mlab namespace. Be sure you are using the one from enthought.mayavi

11. Example with points in 3D mlab.points3d(x, y, z, color=(1.0,0.0,1.0), mode=‘sphere’, scale_factor=0.1) { x.shape == y.shape == z.shape color = (R, G, B) 0.0 <= R, G, B <= 1.0 default is (1.0, 1.0, 1.0) mode = ‘sphere’ , ‘cone’, ‘cube’, ‘arrow’, ‘cylinder’, ‘point’, ‘2darrow’, ‘2dcircle’, ‘2dcross’, ‘2ddash’, ‘2ddiamond’, ‘2dhooked_arrow’, ‘2dsquare’, ‘2dthick_arrow’, ‘2dthick_cross’, ‘2dtriangle’, ‘2dvertex’ scaling applied from numpy.random import rand x,y,z = rand(30),rand(30),rand(30) mlab.axes()

13. Mlab helper functions and the engine pipeline >>> mlab.figure() >>> mlab.surf(call_values) >>> mlab.axes() Array2DSource _ WarpScalar _ PolyDataNormals _ Colors and legends _ Surface Array2DSource _ WarpScalar _ PolyDataNormals _ Colors and leg _ Surface def complete_pipeline_call(data_array): src = mlab.pipeline.array2d_source(data_array) warp = mlab.pipeline.warp_scalar(src) normals = mlab.pipeline.poly_data_normals(warp) return mlab.pipeline.surface(normals)

15. Mlab and Traits (mlab_traits_ui.py) class ActorViewer(HasTraits): scene = Instance(MlabSceneModel, ()) view = View(Item(name='scene‘, editor=SceneEditor(scene_class=MayaviScene), show_label=False, resizable=True, height=500, width=500), resizable=True) def __init__(self, **traits): HasTraits.__init__(self, **traits) self.generate_data() def generate_data(self): X, Y = mgrid[-2:2:100j, -2:2:100j] R = 10*sqrt(X**2 + Y**2) Z = sin(R)/R self.scene.mlab.surf(X, Y, Z, colormap='gist_earth') if __name__ == '__main__': a = ActorViewer() a.configure_traits()

16. Mlab and Traits (lorenz_ui.py)

17. Traits, Mayavi and Chaco Vtk_commodities.py (Thanks to Travis Vaught for the example)

18. EPD http://www.enthought.com/products/epd.php Enthought Training: http://www.enthought.com/training/ Webinars http://www.enthought.com/training/webinars.php