Is this possible?
Seems like it could add some cool variation.
Unlikely.
Why would you want to do that? Even if it were technically possible, It would potentially miss particles.
It would be possible to give particles random sizes that are integer multiples of the grid size.
Wouldn’t this be more along the lines of “a particle with an arbitrary size, thus filling multiple voxels at once”? Kind of like Afterburn’s spherical volumes around each particle, filling as many voxels as it encloses?
That is more on the lines of what I was thinking, sometimes my expression of words is unable to convey my thoughts. Just a silly idea, it is most likely not practical enough to consider.
Something that could be perceived as larger and smaller particles. IE I was doing a test of a Fume driven avalanche, using a larger voxel size to emulate debris, which looks nice although all of the debris is the same size, understanding that of course it would be difficult to track the motion of the joined voxels. The same could hold true if you were building clouds, obviously you wouldn’t want the size to vary to much as it would most likely end up looking a little odd.
Another case would be by density, on the outer edges the perceived particles would be smaller and towards the interior they would be larger. I think more give some interesting light effect, as it seems it would have a nice falloff. Does that make sense?