What You’ll Learn
Attributes are crucial to Houdini’s greatness. They’re the gin to its tonic, the Robin to its Batman, the velcro to its… other side of velcro. The point is, attributes are what give Houdini its edge, what make it more powerful than any other 3D program. The pure control, flexibility and freedom that you wish other apps provided, attributes are to thank. Because of them, you can see what’s happening with your geometry data and directly manipulate it in ways other applications don’t allow.
Sure, there are other courses out there that cover attributes. But not like this. In this course, we’re going deep into their mechanics – not just how to create and work with them – we’re going for true understanding of the mathematical, physical and computing concepts behind the data.
By the end of this course, you’ll have a deep understanding of:
- What attributes are, how they’re constructed and why you need to master them
- How the geometry context is really driven by attributes
- The anatomy of vectors and how they work
- All you need to know about normals and why they’re such a big deal in Houdini
- How to visualise attribute data in different ways – seeing is understanding
This is the second course in the Geometry Essentials Collection, step two on the Houdini Made Easy learning path.
Let’s talk details
All this talk about attributes, but what are they and why are they so important? This first section pulls back the curtain on attributes, giving you the foundational principles necessary to truly grasp how they work. Digging into everything from the different methods of creation, to comparing different data types, to controlling how attributes are modified by transforms.
1. What Are Attributes?
2. An Analogy for Attributes
3. The Position Attribute and the Geometry Spreadsheet
4. Attribute Class
5. Creating and Manipulating Attributes
6. Attribute Types
7. Attribute Create Node
8. Attribute Type Qualifier - Attribute Meaning
8 Tutorials 56 Minutes
The Normal Attribute
Normal doesn’t mean boring. We spend around 50% of this course talking about normals because they’re more essential to Houdini than a new user would ever realise. Not just for surface shading, understanding the normal attribute is central to building geometry and effects. We’ll teach you the ins and outs of the normal node, including cusp angle and normal weighting methods.
1. What Are Normals?
2. Calculating and Adding Vertex Normals
3. Normal Weighting Methods
3 Tutorials 15 Minutes
Like looking into a crystal ball (but far more reliable), attributes show you the precise data your geometry is built on. Data without context can be meaningless, but seeing the relationships between your data opens up a wealth of insight. In this section, we’ll cover how to create custom attribute visualisers, remapping values to a 0–1 range, and how to use colour ramps to visualise the interpolation of attribute values. Might not mean anything to you now, but it will soon.
1. Creating Attribute Visualisers
2. Remapping Values and Per Component Ramps
3. Using Colour to Visualise Normal Interpolation Across Primitives
3 Tutorials 15 Minutes
Auto-Generation & Attribute Defaults
For any aspiring 3D superhero, Houdini is a nimble sidekick. Houdini auto-generates normals for you, but for those times when you need specific control over the finer details, you’ll want to add a normal attribute yourself. Here we’ll get you to grips with how to adjust the auto-generation settings and when to manually add a normal attribute instead of letting Houdini take care of things for you.
1. Adding The Normal Attribute vs Auto Generate
2. Attribute Mismatch
3. Default Attribute Values
3 Tutorials 12 Minutes
Anytime you come across a direction parameter in Houdini, you’re working with a vector (a normalised one). Then there’s vector attributes too. You’ll be working with both around the clock, so to nail geometry in Houdini you need to understand vectors inside and out. In typical Hipflask fashion, we’re guiding you into the depths of their inner mechanics so you can maneuver them like a pro.
1. Drawing Vectors
2. Vector Visualisation - Markers
3. Unit Vectors Part 01
4. Unit Vectors Part 02
4 Tutorials 19 Minutes
Normals For Orientation
Let’s bring this full circle, shall we? Now’s the time that normals really shine beyond surface shading. Earlier we taught you how to precisely control attributes, now we’ll give you the ability to add just the right splash of randomisation.
1. The Copy To Points Node
2. Using Normals to Orientate Geometry
3. Adding Randomisation to Attributes
4. Attribute Randomise - Visualising the Distribution
4 Tutorials 20 Minutes
Reversing and Correcting Normals
The computation of surface normals starts with the primitive, but how do we control which way it faces? In comes a lesson on winding order to get you sorted. Wrapping it all up, we’re handing out useful tips and techniques for reversing and correcting flipped normals.
1. Polygon Winding Order
2. Reversing Vertex order using the Reverse Node
3. Shifting the Vertex Order
4. Reversing Vertex Order vs Reversing Normals Part01
5. Reversing Vertex Order vs Reversing Normals Part02
6. Correcting Primitive Normals
6 Tutorials 29 Minutes
When You've Finished
Where to next?
Confused by VEX versus HScript? And when to use one instead of the other? Should you learn one, or the other, or both? What about attributes against variables? Local variables or global variables? Can’t make sense of VOPs? We’ve got you. Once again, we’ll take the concepts and principles apart so you can see and understand Houdini’s working parts, before we put it all back together again and show you how to drive them.
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