Motion Field Examples for MaxFluids (any around)

[Anonymous]

Hey there,

Not sure if anyone knows of any tutorials or examples involving Motion Fields in MaxFluids?  The Help file is really sparse so looking for some extra help.  For example the whirlpool, I created a container, put a cylinder in it, used it as the geometry, added it as a collider, added the motion field, selected the fall off etc, upp'd the around axis setting but it really doesn't do anything when I sim it.  Should the cylinder be animation to rotate also?  maybe that is obvious but it doesn't say in the tuts.  I am trying to do a breaking wave also following the very light on instructions and achieving the same nothing result.

Any suggestions.

Thanks

S.

[Anonymous · Accepted solution]

There`s not really much to it, except that it`s really cool. Just create the Motion Field, adjust it`s parameters and add it to 'Add Motion Fields' rollout. Are you saing it`s not effecting your fluid sim at all?

[Anonymous]

Hey,

Yeh I figured it out late last night, I decided to not follow the Autodesk documentation.

This is what they have for a 'whirlpool'

"Create a cylinder in the scene. In the Group Controls area of the Motion Field properties, enable Geometry to view the Geometry rollout. Click the Pick button and select a cylinder. Enable Falloff. In the Direction rollout, make sure that Direction Magnitude is 0.0, and adjust the Around Axis option. You can also add Drag if the velocities become too high."

I just added the motion controller and put it into the fluid and mucked around with some sims and sure enough the surface is being affected by it.  Might be able to get some choppy water surface happening now.

Appreciate the reply.

[Anonymous]

I completely missed that you can sample geometry for motion vectors too. That`s great! Thanks for bringing this to my attention. I think i should consult the documentation more often. I just placed the Motion Field inside the fluid like you did.

The approach with the cylinder works even better, because you have more control over the falloff using the Min/Max Distance parameters in the geomtry rollout.

[Anonymous]

After mucking around I just used the Boundary to achieve the same result.  You have the falloff and the like also, but haven't tried animating it yet.

I will have a look at the mesh then as the Boundary made the whirlpool very smooth.. where it needs to be all rough and choppy and all maelstrom looking.

With the geo then, you just plonk it in the fluid and bind it to the motion field, do you then need the motion field in the fluid also, i.e. can you have it off to the side and out of the way?

[Anonymous]

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@Anonymous wrote:

With the geo then, you just plonk it in the fluid and bind it to the motion field, do you then need the motion field in the fluid also, i.e. can you have it off to the side and out of the way?

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It seems that the motion is happening where the geometry is located, not the field itself.

[Anonymous]

The reason why I wasn't sure is I tried that also but I was only getting a reaction out of what seemed like the cap of the cylinder.  I tipped it on it's side and was attempting the wave motion.  It was a mess basically bit it also didn't happen along the whole length of the poly that was interacting with the fluids.

Weird.