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nigelgardiner

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About nigelgardiner

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    nigel
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    new zealand

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  1. Hi Ryew Yep pouring a volume of fluid through a spout is definitely an improvement on emitting from a source volume. I'd tried emitting from a source volume thru a spout before and it didn't really work but pouring a bottle or glass of fluid starts to give a better shape. The paper Marty attached above explains the Navier Stokes equations pretty well. Using a spout defines a solid boundary for the time the fluid is moving thru it but then it's defined entirely by a free surface when traveling thru air, surface tension is the major factor here, (thanks Marty) and I think that's able to be defined by mean curvature which you can solve for with gas analysis micro solver, and then, well I'm still figuring that out. I read the Flip smorganic/sheeter effect thread last, Pazuzu's tension work was amazing. Haven't got a flip worth sharing at the moment but will do.
  2. Hi there I've been looking into seeding vorticles and I like the idea but I'm not sure whether they could be used in a flip network and even less sure what I'd plug the gas vorticle geometry node into? Any ideas? I'm thinking it'd be like adding impurities into your liquid. thanks Nigel.
  3. Hi there I've been looking into seeding vorticles and I like the idea but I'm not sure whether they could be used in a flip network and even less sure what I'd plug the gas vorticle geometry node into? Any ideas? I'm thinking it'd be like adding impurities into your liquid. thanks Nigel.
  4. you could using density to separate the different components, that'd make flip layer them by density and apply different forces to them to create the mixing. might be too crude for the behaviour you want to create tho cheers Nigel.
  5. I want to emulate the flow of liquid from the neck of a bottle as per the attached image and out of interest I'm trying to determine how I could control the way it shapes. Sorry I don't know what you call whatever is happening in terms of physics but the liquid in that shot (and real life pours in general) has such a nice shape and taper to it. To date I haven't been able to achieve anything close. I did try and cheat it with noise on the velocities from the emitter volume but that looked terrible. Quickly looking at the fluid notes Marty sent thru earlier, there seems to be a few relationships that could be useful but it's going to take a close read for me to understand it, if i even can. cheers Nigel. pour.tiff
  6. Hi Marty Thanks, I'm already using the swirly kernel. And ta for the fluid notes, much appreciated. Have a good day.
  7. Hi there I'm trying to determine an approach to shaping an emitted flip fluid pour. When you look at fluid poured from a bottle or a jug there's an awful lot going on in the way the fluid surface behaves. it very nicely rolls i guess (not the best description) into itself from the sides and tapers in on itself the further away it is from the top of the pour. It's a really beautiful shape. I should imagine the physics of it is pretty complicated but does anyone have any ideas about a basic plan of attack or know of any documentation that discusses this? I've had a hunt around but don't seem to be able to find anything. I guess I want to be looking at curvature and/or surface tension or something like that and manipulating the velocities on the particles at the edges of the pour relative to those at the centre? Any advice much appreciated, this is just a learning exercise at this stage. thanks Nigel.
  8. Thanks Ryan.
  9. I have shortcut failure H16.0.670 Ubuntu 16.04. yep frustrating.
  10. Hi So I'm looking into solving my issue with a glass of flip collapsing after the emission stream ends. Atom suggested adding a divergence volume so I'll have a look at that but I'm wondering what the difference between using a source volume for divergence and using divergence by attribute on the solver itself is? Also I'm wondering if anyone knows of any documentation describing how to use the pressure and divergence fields in flip? Thanks Nigel.
  11. maybe when there are inter dependencies within in it that would be better separated. which makes things easier to change. say for example a dop network containing related flip, pop and smoke solvers, it seems to make sense to run them as three separate networks so if there is an issue/change with one part of the network you only have to re run that dop.
  12. that's cool. on a side note, how do you embed the video in the post like that? when i try i just end up with the < code > sitting there.
  13. Just guessing but I think the fetchdata node will take a mask on the rh greeninput, you're bringing in essentially a mask with your sop scalar field, so I think you can just plug that into the fetchdata node?
  14. Hi Hamp I'm a photographer, so for the last twenty years I've been trying to take the blur out of high speed fluid shots, I need to get my head around motion and blur. I'm sure you're right. Re the bubble velocities, yeah they are meant to be advected around inside the fluid surface with a general upward trend. The upward velocity was too large in proportion to the advect velocity and I think I don't have enough swirl in the vel field for the advection. I can't use the flip vel field to advect the bubbles as it doesn't really have the right motion so I build a smoke volume out of the flip surface each frame, move that around, and use that to generate a vel field for the bubble advection. It's possible I have an issue here as well, need to check that. cheers Nigel.
  15. Hi Hamp Thanks. There's a few things I still need to work on but I'll do a higher sample render and try some motion blur next render out maybe. cheers Nigel.