Houdini Vellum Fundamentals - Week 02 - Manipulating constraints and Emitting vellum objects

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Welcome to week 2! This week we're going to dive deep into how we can manipulate our different types of constraints to make them do whatever we want! It's going to be a little bit on the more difficult side, but hopefully still manageable.
Let me know if you have suggestions for future videos!

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Chapters:

00:00:00 Intro
00:01:15 - Covering the basics
0:09:30 - Manipulated constraint with constraintproperties
00:10:15 - manipulating constraints with sop solver
00:13:55 - Basic VEX
00:20:39 - Intro to instancing in vellum
00:28:00 - Instancing in vellum
00:32:00 inflating our instanced bubbles
00:36:50 - fixing emission inside our objects
00:40:30 Explaining VDBs
00:44:32 volumesample in vex
00:50:25 implementing volumesample in our sop solver
00:53:22 Emitting paper
00:59:10 have our constraints pick up on pscale
01:09:06 Outro

[travislrogers]

Great lesson! So many solid tips! Thanks so much for sharing your knowledge 🙏

[marc]

about using copy to points emitting vellum objects, each frame im emitting a low poly vellum object, and want replace this for the higher poly object, using point deform, and its ok for the first object being emitted, but cannot find the way to keep replacing all vellums low deformations being replaced by high poly objects... i check the piece attributes, try use some for each point do this or that but no luck yet....

[fluxstandard]

Omg your video intro was so use. Good to hear what will be going on

[milesquigley]

It won't allow me to access the groups I outputted in sops in the attribute wrangle in the sop solver.

[vezikd]

Hi Tim. Great tutorial and tricks as always. Thank you! Advance stuff is very appreciated. Any chance to extend this tutorial by showing how to source different geometries?

[nathanielprah]

Please can I change the emitting rate. That is to emit every second or more. And can I colour each balloon? I realised that I when I apply random colour to the source point in the sopsolver or the geometry wrangle, it doesn't apply to the balloon

[syns]

Hey, thanks for the tutorial ! I was wondering how can I emit in vellum and your video came at the perfect time

PS : If you want to delete a channel parameter you can do : CTRL + SHIT + click on the parameter to delete it

[nikoladjordjevic]

Hi there, for some reason i can't find DOP network when i search, i think it is a bug.
Do you know any way to fix this?

[knowledgeistreasure]

Great stuff Tim. Have been looking into Houdini. Is Houdini good to learn for motion graphics, advertisements, etc... Usually it is said that Cinema 4D is industry standard for those things and simple user interface and easier and quicker to get things done. Do you have any experience on this side? So for motion graphics and tv ads use Cinema 4d and for vfx learn Houdini?

[justinlee]

I dont know why, but now using 20.0.625, if i want to scatter points inside the sop solver, the data name of the sop solver need to change to "Geometry ConstraintGeometry", or else it will give me the error "The number of points in the geometry and constraints do not match."

[ThiagoLaranjeiraZerooneBit]

i liked the beard much! so much wisdom

[staimacire]

Help please! Running the first simulation on GPU results in windows freezing Houdini. It runs fine on CPU, but can't get it to work on GPU. Happens on both 18.5.596 and 19.5.368

[richnosworthy]

Hey Tim, this is really cool to see your process - particular i liked your method for removing intersections on the bubble sim. I've done a similar thing before but less streamlined. One thing i notice though is if you have the vellum substeps greater than 1, it breaks. You find that too? I feel like i've had this before where its trying to process that multiple times because of the increase in substeps. Really helpful though : )

[animhaxx]

Everyone should learn vex. It's not that hard, it's very very powerful in Houdini

[moimatthieu]

Hi ^^ This is maybe not the right video or context to ask a very specific question but there is something I am still not able to figure out by myself and can only copy and repeat from other tutorials.
It is the type of inputs of a geometry wrangle. I still cannot find a "trick" to tell to myself to understand what means "Myself" and "Myself (No reads of outputs)".
If someone could give me a simple explanation to differenciate both type of inputs and help me understand what they do exactly, that would be awesome ^^