Houdini Houdono | Simulation - Episode 7 - Wind Tunnel

Smoke simulation is a daunting task a decade ago, but it's really quite straightforward to setup these days. Let's build this extremely useful wind tunnel setup together; we can see this techniques being used in a bunch of Masonry Studio's Razer and Canon product trailers.
Past couple weeks have been quite busy at work, but I'm determinded to finish the series. Let's go!
As always, if you don't know the basics of Houdini, check out Houdini Isn't Scary: • Houdini Isn't Scary - ...

[@jesjesline]

Thanks :) Great Video , Keep them coming

[@MrSaddydaddy]

Looking so nice:) can you share hip as well? You will save my day:) thank you for a great tutorials!!

[@RonaldFong]

thanks for enjoying the tutorial. The IG hip giveaway is over for quite some time now. :)

[@igobyzak]

Great tutorial! Thanks so much for sharing!

[@RonaldFong]

My pleasure!

[@philiprafferty849]

Excellent, thanks so much, many useful tips in there

[@RonaldFong]

Thanks Philip! Share it with your peers :)

[@ifaisalstudio]

Love the knowlege you are sharing, thank you.

[@RonaldFong]

Love your comment and when you share this video with your CGI friends! Cheers!

[@ifaisalstudio]

@@RonaldFong Thank you so much, if you are on Linkedin, I can spread the word there as well, do let me know?

[@RonaldFong]

@@ifaisalstudio not very active there, but yes, sure! www.linkedin.com/in/ronaldfong

[@raimuhammaduzairfareed7628]

You are doing awesome content brother Thanks for this

[@RonaldFong]

cheers! spread the word!

[@raimuhammaduzairfareed7628]

@@RonaldFong sure

[@Ireath1]

Did a wind project at work. Wasn't entirely happy with it. Will revisit the project after I've seen this. Thanks!

[@RonaldFong]

Hey Tobias! It happens to the best of us :) We too revisit the setups to make sure our next project runs smoother!

[@dirpter9811]

I very very love your vioce!!

[@RonaldFong]

Aww thanks!

[@RMAFIRE]

Impressive !! 💣💎

[@RonaldFong]

Thank you!

[@JosefMaxwell]

Awesome tutorial! Little snag on my end though, do you know if Houdini 19.5 requires anything different for the VDB collisions with the pyro source? I hooked it in the same but it's not colliding

[@RonaldFong]

Hey Josef! I haven't used 19.5 for Pyro work. I'll have a look at it to see what could the missing puzzle piece be. Thanks for pointing it out! Will update here :)

[@RonaldFong]

I've just tried it on a default pig head in 19.5, and it works by default. Perhaps you can try to swap the pig head in, and if it works then perhaps you can look into your collision geometry :) All the best Josef!

[@greccovarella9711]

Hey just chiming in to help a little bit :) Make sure your geo is closed. I ran into the same problem a few weeks ago on a project.

[@jamaljamalwaziat1002]

thank u alot

[@RonaldFong]

you're most welcome. Do share with me your results of you give this a try!

[@kikoulzouky8111]

this series is very amazing great job. where did you find the link of the skull please? thanks for all

[@RonaldFong]

pm me on IG, I'll send you a link to it :)

[@kikoulzouky8111]

@@RonaldFong Thanks

[@user-nv6od8kd6x]

Great tutorial but I don't know how to render the simulation using mantra. so sad.

[@RonaldFong]

Aw man, but perhaps it's a blessing! Mantra is very slow, and maybe we'd all be sad if we use Mantra 😅

[@abhirammoney7613]

cool 😀

[@RonaldFong]

Thanks!

[@marcoieraci]

17:06 Unfortunately The vel doesnt transfer on volumerasterizeattributes, it doesnt appear with the middle mouse button and also the bounding box doesnt appear

[@RonaldFong]

Perhaps you can check if the velocity attribute is present on the polyframe node, before attempting to rasterize it! Hope that helps!

[@SmokeSkreenPrime]

Cloth patterns please! Am all for it!

[@RonaldFong]

Thanks Steve! On its way!

[@WangersenOnFireTV]

nice tutorial! Everything works except that the self-created lines with polyframe and volumerasterizeattributes (changed from vel to v) react with a merge on the pyrosolver. Unfortunately, during the test (Gravity to 0), nothing happens to the smoke. could it be that with the new version of the pyrosolver in Houdini you have to do something differently? Best regards and thanks for the great tuts!

[@RonaldFong]

Hey Nico! thanks for pointing it out. I'll need to check this. Which version of Houdini are you using? I'll like to look into it, so that people reading the comments can sidestep this problem :)

[@WangersenOnFireTV]

@@RonaldFong nice fast feedback! My Houdini version is 19.0.455

[@RonaldFong]

@@WangersenOnFireTV got it! Ah, I happen to be on my phone! it's late in Singapore. I'll check it when I get to the studio tomorrow morning! I'll check back here. :)

[@JJeoong_]

i have same problem 😂😂

[@RonaldFong]

Hey Nico! I tried the technique in Houdini 19.0.455 and it still works. The problem is in the tutorial - I made a mistake at around 16:30 to where I erroneously appended a "VDB from Polygons" node, instead of "Volume Rasterize Attributes" node. This mistake was meant to be cut out in the edit, but it's left in the tutorial, hence the confusion. So let me clarify here: Step 1: Use the polyframe node to export the tangent name as "v" Step 2: Use the volume rasterize attributes node to rasterize this "v" attribute in to a "v" VDB Step 3: Merge it with the main stream of density/temperature volumes. The solver should then by default source "v" as "vel" for its volume simulation. Hope this clarifies!

[@urgisjot]

Hey Ronald the filecache node for some reason removes the names of attributes, so now they're title 0 and 1 instead of density and vel, do you know what could it be? the clean node isn't touching those values, it's only after the filecache node houdini 19..

[@RonaldFong]

Hey, this usually happens when we delete the "name" attribute, and the clean node may have done that. Then again, I hear you, you said it isn't the clean node, so it could really be the filecache node, did you cache it into .vdb or .bgeo.sc?

[@urgisjot]

@@RonaldFong it was .vdb and when i changed it to .bgeo.sc then that fixed it! Wonder why

[@RonaldFong]

@@urgisjot it could be because your simulation output is a Houdini volume (turquoise) and not an OpenVDB volume (blue)?

[@aminecrb8949]

Your tutorials are amazing, i hope ur not done with tutorials after this serie, It would be really awesome if can do tutorials about real work scenario like commercial/TV/Film work Again thank you very much for this serie !!!

[@RonaldFong]

Thanks Amine! Nope, not done with giving back to the community! That's a pretty good idea, to breakdown some production setups. I'll have those scheduled. Thanks!

[@aminecrb8949]

@@RonaldFong Thanks sir !!!