VisPy features:

1. You control the main loop. (VisPy uses pygame)
2. OpenGL 3D.
3. Integrated library for basic geometric shapes: triangles, cylinders, cones, arrows, spheres, bars (box), disks, lines)
4. Also more complex 3D objects:
   1. Curves: To generate curves out of points in real-time
   2. Grid: Background for the curves
   3. Plot: Plots curves added by the user and a grid to show an osciloscope like display.
   4. Articulated bodies (using orocos-kdl)
      1. Frames: Three arrows, ortogonally oriented.
      2. Segments: Bars representing kinematic links.
      3. Articulated: A kinematic chain made out of segments.
      4. Articulated tree: A kinematic tree made out of articulated bodies.