1) Stream surface from circular ring seed at y=64
2) Circle centered at (64, 64) in xz-plane with radius 30
3) Bidirectional integration along velocity field 
4) Surface coloring by vy (vertical velocity) component, Surface opacity set to 0.85
5) Cool to Warm (Extended) diverging colormap
6) Color bar with label 'Vertical Velocity (vy)'
7) Black background, Elevated camera view (45 degrees), Output resolution 1024x1024