cmiVFX - High End Online Visual Effects Training

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    For over 10 years, we at cmiVFX have been providing valuable lessons in both real world and experimental techniques that define the very fabric of the Visual Effects Industry. Our training material cannot be found anywhere else because we provide you with knowledge from mentors who have contributed to a number of the world's most famous movies, advertisements, and media. We operate based on your participation. Each and every sale funds new lessons and web development. Come be a part of the vfx community and join with thousands of others who have made cmiVFX their indispensable source for visual effects and computer training. (REGISTER HERE)

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    Tutorial Info

    CMIVFX Houdini Frictional Viscosities Large Poster
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    Duration: 06.01.09

    Houdini Frictional Viscosities

    cmiVFX has released Visco-Elastic Fluids in Houdini. This video is based around the theme of Learn, Test & Create. Firstly we'll be covering basic ways of producing a Jiggly / Squishy effect without heavy techniques. We'll also be learning about adding Microsolvers into Houdini's solvers and using a ready made group of microsolvers wrapped in a digital asset. Next we'll cover a workflow for Testing the different parameters of a simulation. As sometimes there are many different values you'd want to try, we'll set up a simulation and run it many times with certain values changed - then bring them all side-by-side for comparison. Finally we will Create an exploding egg with elasticity, setting up egg white and egg yolk in a cool slow motion scene. As a bonus chapter, we will create an "Exploder" digital asset and import forces for use in Fluids / Pyro / RBD. This video also looks at some brand new Houdini 12.5 features such as Open VDB tools and the Point Wrangle node.


    • CMIVFX Houdini Frictional Viscosities
    • CMIVFX Houdini Frictional Viscosities
    • CMIVFX Houdini Frictional Viscosities
    • CMIVFX Houdini Frictional Viscosities
    • CMIVFX Houdini Frictional Viscosities
    • CMIVFX Houdini Frictional Viscosities
    • CMIVFX Houdini Frictional Viscosities
    • CMIVFX Houdini Frictional Viscosities
    • CMIVFX Houdini Frictional Viscosities

    Chapter Descriptions

    Jiggle And Squish

    To start off we'll be looking at some methods of achieving some jiggle and squishy motion without using flip fluids. The aim is to see if we can get a good result with lower level tools instead of diving straight into a higher technique. This could save a lot of valuable time developing a shot.

    Microsolvers Intro

    This chapter is about getting a better understanding of how microsolvers work within a solver. We'll perform some R&D to recreate how non-newtonian fluids act in real life, adding extra functionality to the base FLIP solver.

    Elasticity Intro

    We will be using an asset that uses some microsolvers to add Visco-Elastic properties to the FLIP solver. Much like if handed the asset in a production environment, we will learn how its created and cover the basics of how to use it.

    Tests Create

    Now we know how microsolvers and the elasticity asset work, lets create some tests to see the effect different parameters have. To start with we will set up a zombie head to melt into gloop.

    Tests Wedge

    In this chapter we will look into how we can efficiently run a simulation any number of times, changing values in each version. We'll set up 5 variations of the same simulation using Takes and the Wedge Rop, and cover how to use either random or precise values for each.

    Tests Mesh

    With our simulation variations cached to disk, we can use the wedge ROP again to mesh each one. We will also look at some new features in Houdini 12.5 such as Open VDB and Point Wrangle.

    Tests Display

    As a small final chapter for this section, we will lay out our different tests side by side so we can directly compare the differences in each one. This will really emphasize differences and allow for direct comparisons.

    Egg Setup

    So finally lets create! This chapter we'll get our simulation up and running. We'll create an egg that has different color, viscosity and refraction for the egg white and yolk.

    Egg Elastic

    In this chapter we will create a flexible system that will give us impulse / explosion velocities. Alongside this we can add on the elasticity asset and get our egg looking cool!

    Egg Finish

    Finally we'll cover some finishing touches. I'll look at the final simulation and mesh settings i used, as well as looking into notes points for rendering. We'll use the new Open VDB tools to create the egg yolk interior and add our custom refraction parameter into a shader.

    BONUS! Exploder Asset

    As a bonus chapter, we'll look into turning the system we made in chapter 09 into a digital asset. We'll then use this asset to affect Pyro / Fluid simulations and RBD's!

    About the Instructor

    Craig Tonks is a young VFX Artist out to create beautiful and exciting images. With an MA in Digital Effects and a growing number of VFX jobs under his belt the future is bright and fun! His passion for playing in Houdini whilst combining both artistic and technical methods makes for fun and explorative videos. Always on the lookout for work, friends and feedback you can contact him at: craig@mrtonks.co.uk

    Additional Credit

    Special Thanks to John Lynch for his research and hard work that resulted in this excellent visco-elastic flip OTL asset. (included in project files)

    AND special thanks to our Mudbox Mentor for the KILLER audio track we used in the video. THANKS BRO. Here is his link: http://soundcloud.com/wayne-robson

    Project Contents

    All cmiVFX videos come with all the training materials you can need right from our website. No matter what time of day, your location, or how your feeling, cmiVFX will be there waiting for you!

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