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poppy

FLIP smorganic/sheeter effect?

84 posts in this topic

There's no fluid software in the market capable to do this effect. CIS Fusion have a great solution, but is not ever close to ideal, since it looks like there's no concern to volume preservation and correct surface tension. The paper that Skybar posted is the best solution so far to flip method, but it relies on a anisotropic meshing system (flat spheres instead of spherical ones), which is currently not supported by OpenVDB or any other software.

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Hi,

Is there a way to achieve this effect in H?

https://vimeo.com/12992186

http://www.fusioncis..._smorganic.html

Currently I'm working on a fast and stable solution to this limitation, I'll sold the asset in Orbolt very soon (I'm working on the promo video ;)).

Here is a little example (comparison) of my aeb_FLIP_sheets asset. This test was executed with the solver default settings and a small amount of particles, to ensure that my asset work even at very low resolutions, in this scenarios is like a localized up-rez technique.

post-3275-0-81564700-1375062075_thumb.jp

post-3275-0-22361300-1375062100_thumb.jp

Edited by Pazuzu
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Currently I'm working on a fast and stable solution to this limitation, I'll sold the asset in Orbolt very soon (I'm working on the promo video ;)).

Here is a little example (comparison) of my aeb_FLIP_sheets asset. These tests were executed with the solver default settings and a small amount of particles, to ensure that my asset work even at very low resolutions, in this scenarios is like a localized up-rez technique.

http://speedy.sh/ASJ...ts-examples.rar

The download doesn't seem to work for os X. Any other way to share it?

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The download doesn't seem to work for os X. Any other way to share it?

Sorry for that, (this time are Quicktime files) but here is another test.

The sheet_tendrils video, forces the tendrils and fills the holes in a more agressive way.

sheets.mov

sheets_tendrils.mov

same_sim_without_asset.mov

Edited by Pazuzu
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There's no fluid software in the market capable to do this effect. CIS Fusion have a great solution, but is not ever close to ideal, since it looks like there's no concern to volume preservation and correct surface tension.

Mark at Fusion CI Studios came up with the workflow originally. There's a plugin for it now in RealFlow and has been for a couple versions. It's called the sheeter daemon. True, it's not physically accurate but in order to simulate thin sheets and preserve volume it would take a lot of particles (probably billions). Faking it is the only practical solution for now.

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Sorry for that, (this time are Quicktime files) but here is another test.

The sheet_tendrils video, forces the tendrils and fills the holes in a more agressive way.

Thats very cool. Can't wait to try it!

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Here is another example, this time without gravity and a more subtle threshold for the hole filling.

More examples to come!!!

sheets_03.mp4.rar

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looks really cool!!

can't wait to see more examples :)

There's no fluid software in the market capable to do this effect. CIS Fusion have a great solution, but is not ever close to ideal, since it looks like there's no concern to volume preservation and correct surface tension. The paper that Skybar posted is the best solution so far to flip method, but it relies on a anisotropic meshing system (flat spheres instead of spherical ones), which is currently not supported by OpenVDB or any other software.

I recall seeing an anisotropic meshing mode from the Thinkbox Frost website, although I'm not sure if it's the same anisotropic meshing method mentioned in the paper posted by skybar.

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There's no fluid software in the market capable to do this effect. CIS Fusion have a great solution, but is not ever close to ideal, since it looks like there's no concern to volume preservation and correct surface tension. The paper that Skybar posted is the best solution so far to flip method, but it relies on a anisotropic meshing system (flat spheres instead of spherical ones), which is currently not supported by OpenVDB or any other software.

Implementation of anisotropic method is quite simple, I made one https://github.com/mishurov/anisotropy_matrix But since Houdini uses OpenVDB for surfacing the FLIP, therefore OpenVDB developers should add that algorithm into their library. And there are some perfomance issues to use fastest method for calculation of Single Value Decomposition and so on.

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This achieves with better surface tension calculation what nodes like the sheeter daemon achieve with particle reseeding:

Versatile Surface Tension and Adhesion for SPH Fluids

http://cg.informatik.uni-freiburg.de/publications/siggraphasia2013/2013_SIGGRAPHASIA_surface_tension_adhesion.pdf

http://cg.informatik.uni-freiburg.de/movies/siggraphasia2013/sigasia13_video.mp4

http://cg.informatik.uni-freiburg.de/people/nakinci.htm

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Impressive!  Will be great to have this as part of the Houdini liquid FX arsenal!!

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