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enter image description here

I can't seem to make the trail into a cone shape. Right now, the particles spread out from the emitter. I want them to start at the emitter radius and move closer to each other - to have a cone shape, with the smaller radius being the path the Ball is taking (there's an actual hidden line the ball follows).

Please help

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  • $\begingroup$ I don't know if this helps, but maybe add a force field which has a pulling force to the scene and parent it to you ball. $\endgroup$ – Reaper Jan 26 '17 at 11:08
  • $\begingroup$ I recommend watching this. $\endgroup$ – Mentalist Jan 26 '17 at 12:54
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In your particular case (with a spherical emitter) you might be able to get away with simply reversing the sign of the initial particle Velocity along the Normal. With a positive Normal velocity the particles will spread out from the surface. However, a negative Normal velocity will start the particles in a direction towards the centre of your mesh so they will naturally converge on each other. You will need to tweak the strength, particle life span and/or damping so that they don't cross over.

Converging particles

EDIT : To retain the 'engulfing' effect of the emitted particles, you can emit the particles from a separate (non-rendered) mesh that surrounds the original object. This will allow the particles to be emitted a distance away from the surface so that they surround it rather than emanating from within.

emitter mesh

Note that the emitter mesh is set to not render.

emitter not render

To fill in the gap between the surface and where the trail particles are emitted you can add a second particle system - emitting short lived particles from the surface to the point at which the trail particles are emitted. This will make the object appear to "fizz" with particles and will mask the fact that the trail particles are actually emitted at a distance from the surface. Increase the number of particles to get the desired density.

enter image description here

This can produce the following result :

final

You could add Brownian motion or a turbulance field or other fields so as to make the particle path less linear.

Blend file attached.

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  • $\begingroup$ Thanks! Excellent and quick fix. Got a great looking effect. $\endgroup$ – Cypher_CS Jan 29 '17 at 9:34
  • $\begingroup$ Any idea how to do this AND keep the "engulfing" effect of the particles while the ball is traveling? $\endgroup$ – Cypher_CS Jan 29 '17 at 9:34
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    $\begingroup$ @Cypher_CS Glad it helped. I've updated the answer to include more 'engulfing' particles. $\endgroup$ – Rich Sedman Jan 30 '17 at 9:03
  • $\begingroup$ Yeah, I figured it couldn't be done from the same object as emitter. Thank you very much. $\endgroup$ – Cypher_CS Jan 30 '17 at 11:27

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