Houdini vellum mass

Posted on 14.12.2020 Comments

A thing I found surprisingly tricky was to take the default lsystem tree and convert it to vellum. It'd flop about, fall apart, no matter what I tried. I got a better feel for vellum after watching the John Lynch masterclass a few times, taking notes see below.

The hip does more stuff colliders, breakable pin constraints, plasticity, scale to a forest etcbut recognizing wireframe things need hair constraints rather than cloth, and how to identify when the number of constraint iterations are too low, were the important lessons here. Probably worth pointing out what the second vellum configure node is for. In the first stage I pinned using the existing vellum configure hair node.

When done this way the pins will inherit the same stiffness values as the rest of the hair. To control stiffness and breaking, I removed the pins, made a new vellum constraints node, mode 'pin to target', and gave it the root group from before. By default this is a permanent pin, which has almost no controls. By swapping the mode from 'permanent' to 'soft', the strength can be controlled and breakable can be enabled. To work out the breaking threshold I just hit a single tree with the sphere, gradually increasing the threshold until it looked like it snapped at the right time.

Watched a few Entagma and Sidefx vids, saw a fun walking setup on Twitter, had a go myself. Knowing that vellum happily supports multiple constraints doing different things, this has:. There's a few delta mush nodes here and there to keep it smooth, and the final connectivity sop and split was because only after I simmed did I notice the eyes had fallen out of the head and rolled around on the floor, those 2 nodes tag and delete them. Simple take on vellum for a hairstyle that needs to retain its shape when driven by animation.

This uses a single vellum hair constraint with bend stiffness of 1, Like most people I first left the groom static, had the animated head geo, and used a 'attach to geometry' to bind one to the other. This is fine for binding a vellum flag to a moving pole, or other simple effects, but for hair the hair acts as if its on a frictionless hinge at the root; it has no sense of maintaining its orientation relative to the head, the system just collapses into a heap.

What you really want to do is make the guides inherit the scalp animation pre-sim, then let vellum layer on the jiggly sim parts of the motion afterwards. You can do this with a guide deform. Give it the hair, the static head, the animated head, the guides will bind themselves onto the scalp in a rigid way.

Now that the guides are doing the right thing, you can use the 'pin to animation' controls so that the roots are locked, but the rest can slop and slide around. Possibly more interesting here is how myself and the fine students at ALA are doing groom; its all in sops, no hybrid hair obj things.Feel free to skip down to the examples if you're pressed for time, this intro and notes are a little rambly Suddenly your world is upside down.

Parameter panels look different, data flow is no longer linear, the geometry spreadsheet has gone weird, even the base layout of nodes is slightly different, nothing can be laid out in straight lines anymore, almost like its intentionally throwing you off balance.

Having chipped away at it for a few months, I can say it's not that bad. Ironically, a lot of the initial confusion stems from the way DOP networks are created by the 'user friendly' shelf tools.

houdini vellum mass

They might be easy to create, but they're not easy to pull apart, and even harder to understand when they don't work as expected. These examples are mainly about creating simple self-contained setups, with as little roundabout references as possible, with the shortest explanation possible but no shorter.

Some text rambles on, some is super brief, but the idea is that they show the technique and the minimum nodes required to setup an effect. These are definitely not 2 hour masterclass lectures! Dops aren't sops obviouslythey don't directly model the flow of points through a graph, rather they setup behaviors and relationships. Remember that a sim is all about calculating based on the results of the previous frame, so thats what DOP networks are there to help you setup; a way to set an initial state, then a loop where data flows through, gets to the bottom, is fed into the top again, every frame.

Remember also that sims aren't a geometry processing system the way SOPs are; it's not necessarily a linear flow of data from start to end. A particle system might make new points every frame, a RBD system might spawn new shapes or delete old onesa pyro solve might be working with a fixed amount of voxels, but the inputs for, say, velocity, might be totally different each frame.

A straight-up data flow like SOPs doesn't work here. That said, a lot of dop nodes are actually sop and vop networks under the hood, one of those 'aha! Eg, if you dive deep enough into a ripple solver, you find that its a hairy-yet-understandable vop network.

Generally speaking, they're not as complicated as they look at first glance, but they're not not complicated. Start with the simple things like a pop network or the ripple solver, work up. Oh, and that weird looking geometry spreadsheet problem?

The attributes you want are there, just a little further down. In the left side of the geo spreadsheet, expand blah object eg popobject for a pop solverand click on 'Geometry'. There's the spreadsheet you missed so much. While the examples embedded in the help docs are pretty good, the help info itself is of varying quality. The worst is that a lot of dop nodes have an identical chunk of text for common attributes, after a while you gloss over them to skip to the examples.

houdini vellum mass

The problem there is when you realise that a lot of dop nodes rely on specific point attribute to do interesting things, but they're not clearly marked, or there are so many attributes that the interesting ones get buried.After we went over shading, lighting and rendering refractive materials in our latest video in Renderingyou wanted to know how the liquid splash we used had been created.

Look no further — in this tutorial Mo walks you through all the necessary settings […].

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May we […]. Download Project File. And while pondering some other algorithms, we needed a bit of distraction. So we ended up throwing together this one: A very straightforward and not so […]. Watch pt. In […]. Download Motion Operators for free. This time using Redshift, one of our favorite engines when it comes to working and rendering in Houdini.

Yes it costs money. However […]. With version 17, Houdini introduced a new simulation framework called vellum. It is based on position based dynamics and thus offers a relatively fast way to simulate a multitude of effects.

Ever wanted to take your meshes apart and work on their individual polygons? This gives you the ability to create evolving shapes, hand built particle systems […]. Apart from attributes, loops and iterative techniques are maybe the most useful concept when building your procedural geometry inside Houdini.

With very efficient node trees we can cook up pretty intricate effects. A few words on how to get our animated geo out into other tools. And more importantly a few thoughts about helping yourself when stuck in Houdini. How about we start art directing our scattered spheres and rebuild our setup so we can paint where we want our objects to got?

Look no further! A bit of depth of field can never harm! Learn how to tweak your render settings in Mantra for final rendering. What on earth did we just do?! Houdini ! Since the release of Blender 2. Eevee is free and gives good and quick results, so why not bringing over effects from Houdini to render there. Houdini 18 has been released!

I grouped […]. While Manu and I have been on season break, my twitter stream washed up these mesmerizing, beautiful videos.

houdini vellum mass

Turns out they are created by Sage Jenson, a genius digital artists. But not only do they create these fantastic pieces of art, they also go to […].

Yes, it definitely took us longer than anticipated to get back and restart the free stream! Believe me it was a ride.

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We should maybe talk this through in a nerd rant. However be aware this is all pretty new and […]. Thanks so much for your feedback, support, links, questions, everything!Controls if the microsolver is solved at all. Can be used to add constraints on a specific frame, for example. How frequently to try and create constraints. Some types of constraints you wish to create just once, and in this case the On Creation Frame simplifies the setup.

Dynamic constraints you may wish to create less frequently than every substep as creating and destroying constraints will slow the simulation. Apply the creation rules every substep.

houdini vellum mass

This has the greatest accuracy, but creating constraints can slow the simulation. Constraint Type. The type of constraint to generate. This affects the visibility of many of the other parameters.

HoudiniVellum

Usually this is set by using the appropriate tab-menu macro. Each edge in the display geometry is turned into a distance constraint maintaining that edge length. Each pair of triangles or implied triangles if input is quads or higher creates a constraint maintaining the initial dihedral angle between the triangles.

Cloth constraints consist of both distance on edge and bend across triangle constraints. Hair constraints consist of distance on edge and bend between edges. This bend also includes the twist of the edges, allowing torsion effects. String constraints are a lighter weight hair constraint.

They are a distance along the edge and the angle between edges. But no twist constraint is present, so the edges can spin freely. The specified points will be pinned to the corresponding point in the target geometry. The target geometry for a Vellum solver is usually the first input, so matches the animation, but can be overridden. The specified points will attach to the geometry in the third input. They will store their closest point at the attach frame and create a distance constraint tying them to it.

Stitch points within the same geometry together using distance constraints. The points do not need to actually be connected by geometry. This is useful for keeping jackets closed or preventing pockets from flapping.

Each piece, as determined by the Define Pieces parameter, stores its original volume and a many-point constraint is built to maintain it. The enforcement is global, so squishing one place will expand another, like a balloon. Each tetrahedron is turned into a constraint to maintain the volume of the tetrahedra. Note this does not include any shear or stretch constraints - additional distance constraints need to be added to make a proper softbody.

While not a constraint per-se, this will edit the weld attribute to cause the points to be logically fused into a single point for the solve. They will remain independent points otherwise, however. In addition, this can build bend constraints where edges have become logically fused, ensuring the result acts like a single flat piece. The Vellum Post Process SOP can rewire the welded vertices after simulation so that the geometry appears connected for rendering.

Each point will search for a nearby point that is not a member of its own piece.Other improvements include a more realistic chipping algorithm, support for easy fracturing with custom meshes and new soft-constraint plasticity attributes. PYRO FX With the addition of a new Sparse solver, you can now create more impressive fire and smoke shots with detail where you need it. Houdini 18 includes a highly controllable solver for Pyro spreading — and the entire Pyro FX pipeline is available in SOPs, including post-processing.

Velocity blending and relative motion controls offer more stability during high-speed scenarios and Vellum also has new sliding constraints to create unique effects.

FEM now offers a fast, accurate and stable global-nonlinear GNL solver, a fully-symmetric solver with built-in Neo-Hookean material model and robust recovery from partially penetrating tetrahedral meshes. FEM also has significantly improved handling of fast moving objects.

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From the Bend tool to Bevel and Sweep, there are lots of useful improvements to the tools you use everyday. And Terrain now has advanced terracing capabilities for more realistic results. Is this file safe? Your email address will not be published. Notify me of follow-up comments by email.

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Notify me of new posts by email. Solid Angle Arnold for Cinema 4D v2. Leave a Reply Cancel reply Your email address will not be published.May we […].

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Based on our initial Mantra setup we adapt our scene to be rendered in V-Ray. Download Project File. And while pondering some other algorithms, we needed a bit of distraction. So we ended up throwing together this one: A very straightforward and not so […].

Houdini 17 - Intro to vellum

Watch pt. In […]. Download Motion Operators for free. This time using Redshift, one of our favorite engines when it comes to working and rendering in Houdini.

Yes it costs money. However […]. With version 17, Houdini introduced a new simulation framework called vellum. It is based on position based dynamics and thus offers a relatively fast way to simulate a multitude of effects. Ever wanted to take your meshes apart and work on their individual polygons?

This gives you the ability to create evolving shapes, hand built particle systems […]. Apart from attributes, loops and iterative techniques are maybe the most useful concept when building your procedural geometry inside Houdini. With very efficient node trees we can cook up pretty intricate effects.

A few words on how to get our animated geo out into other tools. And more importantly a few thoughts about helping yourself when stuck in Houdini. How about we start art directing our scattered spheres and rebuild our setup so we can paint where we want our objects to got?

Look no further!

Houdini Tutorial – Vellum booty shake

A bit of depth of field can never harm! Learn how to tweak your render settings in Mantra for final rendering. What on earth did we just do?! Houdini !

AN INTRODUCTION TO VELLUM SOFT BODIES

Since the release of Blender 2. Eevee is free and gives good and quick results, so why not bringing over effects from Houdini to render there. You Asked for it — there you have it: Two hobgoblinish nerds rambling on about computer graphics in general and Blender and the recent hype in particular. Houdini 18 has been released!

I grouped […]. While Manu and I have been on season break, my twitter stream washed up these mesmerizing, beautiful videos. Turns out they are created by Sage Jenson, a genius digital artists. But not only do they create these fantastic pieces of art, they also go to […]. Login via Patreon. Nerd Chat: Dr. Guest Tutorial: Dr.In my first vellum article I talked about some basic knowledge you can use in your in your vellum setups. Here I'll talk about how you can use vellum more successfully in productions.

As well as how to create a vellum workflow that will be less time consuming and more realistic. As well as some attributes and tricks you can remember to use in your vellum creation. Here we go. Updates to Vellum in Houdini In Houdini 18, Sidefx made several updates to vellum to improve it's overall function.

I thought it might be good to do a quick summary on these before moving forward. My last article was done with Houdini When you now adjust the mass, scale, other parameters, or topology, Houdini will now allow you to manually adjust some of parameters that were locked in default in You can now manually adjust the mass and thickness with a Calculate Uniform option. You can also use Calculate Varying which will automatically shrink the pscale for you. Also, remember the default density on the Vellum Constraint node is set to work with cloth.

You will have to adjust accordingly if you are using something different like grains. Sidefx has also improved the way Vellum handles collision objects and reduces tangling between objects.

They have also added per-point collision grouping so you can chose which parts of your vellum simulation you would like to collide with your geometry. You can now stitch points onto primitives instead of just on other points. There is also improved stiffness constraints for how Vellum holds clothing in place. They have also added a falloff ramp for bend and distance. Plus, you can also blend velocities! This is a brief overview of the updates. But you can read up on them more on the Sidefx website listed below.

Vellum Attributes To Remember. If you would like a successful vellum simulation, you'll need to focus on how vellum handles attributes, where they can be edited, where they can be outputted, how constraints operate on them, and how the solver handles them.

Here are some of the important ones, and where they operate in vellum. By welding the points you can cause multiple points to be welded together, but they will remain independent points. By using a vellum post process node you can remove the overlapping points, and make sure the points appear as one.

You can also use weld to weld your edge fractures back together. But you will have to specify the point groups you would like weld to affect. Another thing to note is that the vellum solver will treat two welded points as one point so they will no longer collide with each other.

You can also use stop to unpin points. This attribute does not affect the mass atribute in any way. This is a point attribute to scale the stiffness by. It works in relation to vellum's bend and stretch constraints.