Re: Particular Halo

I was playing with making the emitter do circles this morning, so maybe this will help you. I may be misunderstanding your problem.

I applied the following to the X/Y position property of particular:

width = <i>someValue</i>;
speed = <i>someOtherValue</i>;

value + Math.sin(time*speed)*width;

and then to the Z position property:

width = someValue;
speed = <i>someOtherValue</i>;

value + -Math.cos(time*speed)*width;

this is off the top of my head, so please forgive any errors.

Anyway, this will create a halo ring, then animate your null with the camera parented to it.