Deforming geometry

[Sascha Selent]

Hi everyone.

I´m not sure if I missed something, but does Phoenix not react to deforming geometry? I have a cloth-simulation where I want a kind of towell travelling through the smoke and fire and I would like to have the smoke displaced by the geometry. It works with transforming geometry but not with deforming geometry. Any way to achieve this?

Thank you.

Sascha

[Ivaylo Katev]

unfortunately it's true, the deforming geometry does not produce a correct velocity, and this leads to lack of natural movement of the fluid near to the deformed parts.

edit: actually, i have one idea. make a copy of the deformable object, but with offset one frame. put both the objects in two distance textures. subtract the textures (vraycomptex can do this) and put the result as map for the discharge channel of a dummy source . deselect all the channels of the source and select the deformable object in it.

[Sascha Selent]

Ivaylo!

Always reliable

unfortunately it's true, the deforming geometry does not produce a correct velocity, and this leads to lack of natural movement of the fluid near to the deformed parts.

Sad to hear this. What is the problem? Deforming geometry makes correct velocity RE rendering, so is the velocity needed by Phoenix something different?

actually, i have one idea. make a copy of the deformable object, but with offset one frame. put both the objects in two distance textures. subtract the textures (vraycomptex can do this) and put the result as map for the discharge channel of a dummy source . deselect all the channels of the source and select the deformable object in it.

HAHA, I have absolutely no clue what you are talking about! It´s not that critical in the moment, but if I have time I´ll check your suggestions. For now I have to finish the job

But for he future it will be interesting. Will it be possible to implement this in future releases? I think it´s not that unusual that some deforming geometry (e.g. a character in the smoke) shall have impact to FD, isn´t it?

Thank you for answering.

Sascha

[Ivaylo Katev]

of course we have to provide a solution, it was not provided until now just because is rarely used.

[Sascha Selent]

of course we have to provide a solution, it was not provided until now just because is rarely used.

Glad to hear this. Thank you Ivaylo.

Sascha

[nikand]

Bump...Is this still not possible? I'm struggling with a deformable tube with fluid inside

[Svetlin.Nikolov]

Hello,

It should be currently possible, as long as the geometry does not change its number of vertices at each frame. You can also regulate the strength of the influence on the sim using the right-click phoenix props on the geometry, and playing with the velocity multiplier.

[nikand]

Thank you for your respons Svetlin, sadly this is not working for me.
I have sent 2 examples to support@chaosgroup.com

/Nikolaj

[Svetlin.Nikolov]

Roger that, we'll have a look.

[Svetlin.Nikolov]

Hey,

So with a latest nightly build it seems to work correctly - the bending tube obstructs the liquid, but it's hard for the liquid to keep its volume. You could try using the new FLIP solver for this, it's both faster and will keep the liquid volume. Email support@chaosgroup.com for nightly build access and give it a try.

[nikand]

Thanks Svetlin, i'll give it a try