Hi!!

Test to drive smoke along a custom path.

http://vimeo.com/19882814 [vimeo.com]

Hey Alejandro, I have been very impressed with all your work with the smoke sim. I have been using alot of your ideas to try and create a controllable cloud system for houdini and so am trying to understand how your node network works. While I have been able to implement my own particle driven curves into your network I have had some problems with some wierd smoke artifacts that are baffling me. Any chance you could look at my project file and see what I'm doing wrong?

nice one, I really like the detail you get there. .. I'm trying to archieve a similar effect (except the smoke get sucked into a black hole where it disappears) … and I'd be very curious to know more about your setup

thanks!

90ender
Hey Alejandro, I have been very impressed with all your work with the smoke sim. I have been using alot of your ideas to try and create a controllable cloud system for houdini and so am trying to understand how your node network works. While I have been able to implement my own particle driven curves into your network I have had some problems with some wierd smoke artifacts that are baffling me. Any chance you could look at my project file and see what I'm doing wrong?

Hi!!

The main problem here is that the curves deform at high speed, because of that the smoke doesn't follow well the path, you need to decrease the speed on the deformation or increase the number of sub-steps but it can be very very slow (ensure that your sop deformation has sub-steps).

Also if you have deformation in your path, don't use “set always” as default for all parameters only for “time” and “sop path”.

sum][one
nice one, I really like the detail you get there. .. I'm trying to archieve a similar effect (except the smoke get sucked into a black hole where it disappears) … and I'd be very curious to know more about your setup

thanks!

Thanks!!!

I'll upload soon the setup for H12, is more compact, better controls and very fast.

Cheers!!

Thanks for the advice. It made all the difference!

alejandro

sum][one
nice one, I really like the detail you get there. .. I'm trying to archieve a similar effect (except the smoke get sucked into a black hole where it disappears) … and I'd be very curious to know more about your setup

thanks!

Thanks!!!

I'll upload soon the setup for H12, is more compact, better controls and very fast.

Cheers!!

oh wow thanks, that would be very very appreciated looking forward to it!

Did you ever finish the H12 version of this?
I'd love to have a look to see the differences.

Thank you for sharing so far, I have learnt a lot from this scene.
N

here is a version my buddy did in h12. worth checking out for sure.

http://www.usiak.com/velFromCurve.html [usiak.com]

Thanks, checked it out and it's just a pump source sop, good, but Alejandro's has a lot of DOP stuff going on.

If you dive inside the Source Volume DOP (created by the Pump Shelf tool) and inspect the network inside you will similar things going on wrt creating ad hoc fields and populating them with the SOP's volume data including the ability to take in points (particles) and use these as Geometry data assigned to your Fluid object for further processing later.

niietzshe
Did you ever finish the H12 version of this?
I'd love to have a look to see the differences.

Thank you for sharing so far, I have learnt a lot from this scene.
N

Here is the update for H12, also I haved use it to create this video https://vimeo.com/60124045. [vimeo.com]

The custom fields are all developed in SOP's, remember that you need to import into dops, and then mix it with the vel field, I used to normalize both, the vel field and the custom field, then add those directions, then add the magnitudes, then multiply each result (magnitudes, directions), all of this inside an if statement relative to the custom field magnitude threshold for better performance inside a gas field vop.

PD: Is not finish yet

Cheers!!!

Well done smoke!

Thanks for sharing!

Can you tell me why you normalise your velocities and add the magnitude back on later? Is it just to get a velocity bias so you can choose how much you want to add to it? I find it hard sometimes to control smoke without pushing it too far and stopping looking like smoke… Any tips?

Thanks
C

niietzshe
Thanks for sharing!

Can you tell me why you normalise your velocities and add the magnitude back on later? Is it just to get a velocity bias so you can choose how much you want to add to it? I find it hard sometimes to control smoke without pushing it too far and stopping looking like smoke… Any tips?

Thanks
C

Because is the option that works for most test that I haved done recently, you have many options to mix your custom force with the main velocity: Add, Average, also with the default pump method with a final target velocity; But with direction only I can have always the smoke follow the custom force no matter if the custom force has a low magnitude, even though you need to test the custom magnitude relative to a threshold for the mix with the vel field, that way if the custom field is below the threshold the vel field is intact and flows as it should be.

thanks for sharing this tool, alejandro..

I am just going through Your setup, as you mentioned we have to bring it into dops and mix it with vel,
can you pls post us a simple example or write it down in words, when ever is convenient for you.
coz i would like to learn from your setup, and learn then actual usage. i am kinda stuck how to actually proceed.

thank You.

thanks for sharing this tool, alejandro
but i don't know how to use it. can you give me a project file,thanks very much

Hi, I'm going to warm this up again.

I also seem to have problems getting the otl to work.

Any chance you integrate that into a hip?

Greeting and thanks!

alejandro
Hi!!

Test to drive smoke along a custom path.

http://vimeo.com/19882814 [vimeo.com]

Really good job Man :wink:

Joker386

alejandro
Hi!!

Test to drive smoke along a custom path.

http://vimeo.com/19882814 [vimeo.com]

Really good job Man :wink:

Thank you!!