Questions and discussion for this lecture live here. Fire away by hitting Reply below 
Hi Sean, this is an amazing lecture. I really loved it. Really well taught and presented.
I note you have left the acceleration calculation out. Has anyone managed to differentiate the numbers of the displacements to give us the acceleration which is then used easily in comfort criteria?
Thank you
Hey @mikolaj.pawelczak - great to hear that you enjoyed the tutorial. You can numerically evaluate the acceleration pretty easily; just step through the time history of displacement to evaluate the velocity for each time step and then repeat this for the acceleration. Obviously you’re just calculating rates of change with each step.
Just make sure to remove the mean value from the time-history at each step to avoid any drift.
To test your algorithm - just run a simple sine wave through it and confirm that your code gives you the expected closed-form velocity and acceleration - then apply it to the displacement from your crowd simulation.
Seán