Particles Part 04 - Tubular Flow With Vector Fields
Added 2019-06-14 06:49:08 +0000 UTCAfter 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.
Comments
Have been trying to do exactly this! Thank you so much.
Nathan Rosquist
2021-12-19 08:24:41 +0000 UTCI'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?
adam tracksler
2020-11-13 21:54:37 +0000 UTCYou save my day ... Thank you :)
Daniel Potuznik
2019-08-14 07:52:18 +0000 UTCThanks Manuel, Randomly this tutorial put my nebula project right back on track!! great workflow tips as always.
paul silcox
2019-07-18 16:56:29 +0000 UTCHi 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.
Entagma
2019-07-11 06:57:02 +0000 UTCI 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
2019-07-11 06:53:45 +0000 UTCWow, using VDB vector volumes is great! I am wondering how to shade the particles with these nice gradients now. Any tips? ;)
amaru
2019-07-09 23:24:33 +0000 UTCinteresting 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.
jeremy jozwik
2019-07-09 14:25:30 +0000 UTCfun 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
2019-07-08 21:26:27 +0000 UTCso 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
Ash
2019-06-15 12:16:08 +0000 UTCBalls in the tubes. That probably will not be that difficult. 30 minutes after: "Oh.... ooooook" :)
ILYA LUGVINEV
2019-06-14 17:13:55 +0000 UTC
