Particle system velocity normal animation issue need assistance

Hi guy’s i am currently animating and explosion under water and i want to animate the particle velocity normal so the particle get back quickly to stick to the sphere but it doesn’t work.

The animation is a quick burst of particles outward the sphere and a very quick inward retraction due to volume under water.

I tried setting the keyframe type to linear and constant and nada not working so is there a way to animate it?

velocity-animation

Did u try with forces?

After reading a bit i think it is the only way to do it but will comment back if i have issues.

Animating the forces influences in particules menu should do the trick

If you don’t need fancy motion, you could just translate dupli object as shapekey and set physics type to “None”. Then animate shapekey slider.

shapekey.blend (207.7 KB)

Just test it with force field and it work perfectly but thank i will keep your solution in my growing bag of tricks.

I mark you as the solution Skuax it’s working flawlessly but i know there is also the new animation nodes where it could be achieve but it’s a much more complicated setup.

Would have been nice if the velocity normal animation would have work but it’s seem like a limitation of blender particles system.

Velocity affect particles only at birth time i think.

Trying to animate the force field and i am running into another issue, setting the force make it pulsating all the way until the end of the animation.

I need it to expand and quickly get back inward and stop.

Try to animate Damp in particle system, at 1.0 it kind of freezes motion.

Didn’t thought about this at all, all solutions are welcome since i am just beginning in blender particles system.

I will comment back thank!

OK i was able to finally make it work but once i made a proper shader for the flame it does not follow the particles expansion and i don’t know why since the default smoke domain flame follow the partricles correctly!