When you execute the application, you should see 3 windows. 
Please hit the play button to start the simulation. 
Then you can move around in the 3D view:
W - forward
S - backwards
A - left
D - right
Q - up
E - down
rotating camera with dragging the mouse.
When the simulation is not started the camera is locked. 
The space bar button unlocks the camera.

The parameters of the microtubule:

Length - how much of the microtubule is already assembled
Growing/Shrinking - smooth interpolation between zipper-like growing cap of microtubule, and shrinking cap with individual protofilaments bent outwards
Hydrolysis - how far have the hydrolysis of GTP-bound tubulins into GDP tubulins advanced
Hydorlysis fadeout - how long is the area, where not all tubulins are hydrolized yet, but some of them already are. this is the length of the transition between the part of the microtubule with all GDP tubulins (marked with blue color) and all GTP tubulins

GROWING CAP
Min Protofilament Bending - the minimum bending of the growing (zipper-like) cap of the microtubule
Max Protofilament Bending - the maximum bending of the growing (zipper-like) cap of the microtubule
Min Length - the minimum length of the protofilaments in the growing (zipper-like) cap of the microtubule
Max Length - the maximum length of the protofilaments in the growing (zipper-like) cap of the microtubule

SHRINKING CAP
Protofilament Bending - how much do protofilaments in the shrinking cap bend outwards
Min Length - the minimum length of the protofilaments in the shrinking cap
Max Length - the maximum length of the protofilaments in the shrinking cap 