I would like to elongate particles along their direction of movement proportional to their velocity. Is this possible?

So instead of this:

enter image description here

I'd like to have something that looks like this:

enter image description here

  • $\begingroup$ Maybe try playing around with softbodys? $\endgroup$ – Reaper Nov 10 '17 at 12:16
  • $\begingroup$ planning to use it with regular particles too so a more general solution would be good. $\endgroup$ – yam Nov 12 '17 at 22:40

Half of the solution (read below) with animation nodes

I got close to the solution using animation nodes. It might be very easy to work on this to make it a complete solution but, I must admit, it's my first time using AN!

enter image description here

I've used Animation Nodes v2.0.

The plane (Plane) emits a particle system with 3 particles with a starting normal velocity and default newtonian physics. Particles must not be displayed via the particle system Render settings. In fact, we'll do it using animation nodes. I've also created a "water drop" mesh (Sphere) for duplication.

This is my animation node setup:

enter image description here

It creates as many copies of Sphere as there are (alive) particles, then it scales them along their Z axis by an amount proportional to each one's Velocity vector length. Finally, it rotates the instances to match the direction of the velocity.

HOWEVER, I am not able to pass a list of rotations to the "Transform Output" node, so I'm only passing ONE rotation, namely that of the first particle!!

If anyone knows how to pass a list of rotations instead of a single rotation, feel free to add a new answer.

Blend file (requires animation nodes):

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