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Particles Part 04 - Tubular Flow With Vector Fields (Patreon)

Published:
2019-06-14 06:49:08
Imported:
2026-06
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Videos

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  • Particles04_Start.hip
  • Particles04_End.hip
  • pipes.bgeo
  • Particles04_Start.hip
  • Particles04_End.hip
  • pipes.bgeo

Missing 3 full-res photos, 6 files, as this post has not yet been imported.

Content

After looking at particle theory we now understand that we can drive particles by altering their velocity instead of using forces. This video shows you how to use VDB vector volumes to store a velocity field and then use this to make the particles move. Filling a volume with vectors once, is a lot more efficient than doing the calculations for each particle in every frame. Plus, it's easier to visualize whats going on.

The tube splines are attached. You might have to relink them in the file node.

Files

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Particles Part 04 - Tubular Flow With Vector Fields

Comments

ILYA LUGVINEV

Balls in the tubes. That probably will not be that difficult. 30 minutes after: "Oh.... ooooook" :)

Ash

so amazing Manuel, everytime i hear your voice my brain get so ready for sweet candy of information. Please do more and more videos about particles. one thing i keep struggling with pops or even any houdini contest is RETIMING stuff. say i want to retime some part of the sim to really slow slow motion. this is always a complicated task for me because i have to deal with particles counts not changing and the emission of the particles should be changing, id attribute and so much researching. how I can retime particles changing in count and emission ? even the new retime node doesn’t work probably in this scenario. would you please consider this topic in future lessons ? Thank you so much

jeremy jozwik

fun stuff, at 23:13 when pathing to the box null. you can just hit Ctrl+c and then Ctrl+v in the sop path. no more hunting for nulls!

jeremy jozwik

interesting tutorial. ran into a few issues building this however: https://vimeo.com/347094161 . firstly without the large gaps between tubes its hard to repurpose the boxes as particle killers. even then i was getting a hard edge. which was opposite of the birth side which had a nice soft build up. also, for whatever reason the circular force was not enough to keep them inside the tubes so i had to revert to a collision vdb.

amaru

Wow, using VDB vector volumes is great! I am wondering how to shade the particles with these nice gradients now. Any tips? ;)

entagma
>>24578047

I created a sourceprim attribute when scattering the intial points. Then I used a VOP to put color on the points driven by this attribute. A screenshot of the VOP is attached to the post.

entagma
>>24561302

Hi Jeremy, of course, the circular force is a hack. It works as long as the particles loosley fit inside the tubes. If it fails to restrict the particles to the tubes inside all the time you have to rely on collisions.

paul silcox

Thanks Manuel, Randomly this tutorial put my nebula project right back on track!! great workflow tips as always.

adam tracksler

I'm having a little trouble when I get to the vdbactivate node, Although I'm on "reference" and have the VDB plugged into input 1, and the bound into input 2, I'm seeing nothing in the viewport. I can load the end file and that works, but in my own file it's not. Any ideas?

Nathan Rosquist

Have been trying to do exactly this! Thank you so much.