FumeFX: about Spacing. need help

#1

hi there…
is this spacing setting can change all simulation? (I thought is only increasing/decreasing detail).
because my problem is, let say I am happy the look with my current simulation (at spacing 6.0)…then I want to get more detail, then I decrease the spacing to 1.5 then I simulate again…but the result is totally different with spacing 6.0
so what is spacing exactly doing?

#2

Long time since I’ve done anything in fume, but the way I understand it spacing is the number to divide your container by to get the number of voxels in your container.

So if you have a 10x10x10 container and a spacing of 1 you have 10x10x10 = 1000 voxels in your container.

Therefore if you reduce your spacing to 0,5 you get 8 times as many voxels which in term, like you said give you more detail, but you also get 8 times as many voxels which interact with each other resulting in different results.

Going from a spacing of 6 to 1.5 will, like you said, result in a completely different simulation because your going from very few voxels to quite many, but if you’re already operating with a fairly high number of voxels then decreasing the spacing won’t be as noticeable.

To avoid this you should probably do your tests at a spacing closer to your final spacing.

#3

yup…I thought its like mesh with turbosmooth…increasing the number than get more detail…

but, some how my simulation it seems more sensitive again force(wind) by decreasing spacing.

i am creating dust with fume that come from faraway to go to camera…with my spacing 6… at the end of my simulation dust just move halfway to camera, i am happy with this, but after decreasing the spacing to 1.5…the dust move is different…at the end of my simulation, the dust already covering the camera…

I thought with decreasing spacing I will get more detail and more dust…

or maybe the dust is already there, but because my spacing high they not appear…
after change the spacing to small one…then the dust appear…
so it seems move fast…it is correct?

#4

It will add more detail, sure. BUT you need to then consider the fact that right from the get go the simulation will be different and will result in a completely different shape/result. The bulk of the product will be the same, but micro turbulences and smaller effects will change the overall shape of the sim.

Perhaps setting the steps to be higher will help getting an accurate result with a higher spacing?

Oh yeah, or do what Twiik said. Usually I start high when blocking things out and setting up large settings, as i refine it i lower the spacing to be no more than double my end spacing.

#5

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