USD in depth, part 06 /  by Xuan Prada

Hello everyone,

USD in depth part 06 is dropping today.
This time is all about lighting and rendering.

We will take a look at all the lighting/lookdev/rendering tools available in Solaris.
We will focus mainly on Karma, as it is the propietary Houdini rendering engine and hopefully something that we all can use in production soon.
We will introduce concepts like sequence lighting, shot overrides, interactive render filters, etc.

Some of the topics covered.

- Main takeaways.
- Scene preparation.
- Lighting workflow.
- Sequence lighting.
- Karma settings.
- Motion blur.
- DOF.
- AOVs.
- LPEs.
- Volume rendering.
- MaterialX.

This is a 6 hours long video, so brace yourselves.
All the info on my Patreon site.

Thanks!
Xuan.

Professional photogrammetry 02 /  by Xuan Prada

Here is the trailer for "Professional photogrammetry episode 02".

In this 4-ish hours video I will talk about scanning in natural environments. We will cover everything needed for scanning and processing two different types of natural assets.

The first asset is a 3D asset, the second one is a ground surface. Both scanning and processing workflows are completely different for each, but hopefully after this video, you should be able to grow your own library of natural environment assets.

We go through equipment, scanning patterns, camera settings, etc. Then we will process everything in order to create final high quality assets ready for visual effects and real time.

I hope you enjoy this video, if you like it I guess I will do more videos about scanning in the wild/city.

Thanks!
Xuan.

All the info on my Patreon.

USD in depth, part 05 /  by Xuan Prada

Hello patrons,

Part 05 of the USD series is here.

This is a 3 hours video about working with FX layers in USD.
We will explore different situations where we will deal with roundtrips from LOPs to SOPs to LOPs. We will have a look at different types of FX that require different approaches when working with USD.

From vellum simulations, to rigid bodies or pyro simulations. Nothing very fancy but hopefully, it will give you the information that you need when dealing with FX layers of any kind.

We'll also look into the new USD features available in Houdini 19.5
All the info on my Patreon.

Thanks!
Xuan.

Mix 05 /  by Xuan Prada

Hello patrons,

This mix is not really a mix. What I mean by that is that the two topics covered in this video have a relationship between each other but also with a topic that we will be discussing soon in the USD series.

In the first part of the video we are going to be talking about ingesting lidar scans of natural environments in our pipeline. We will process the lidars to be used as heightfields. Then, we will extract some attributes based on the pointcloud data, later we will create additional attributes that can be used for scattering and lookdev.

Finally, we will export all the data to be used in a different 3D software or in a game engine. Or just to be used in Houdini. Total flexibility.

In the second part of the video we will explore the basics of scattering and distribution in LOPs. This video covers how distribution works under the hood. We will explore random functions and noise patterns to create natural scattering similar to what we can find in nature.

Almost 6 hours of content divided in two videos.

Info on my Patreon webiste.

Thanks!
Xuan.

USD in depth, part 04 /  by Xuan Prada

Hello patrons,

USD in depth part 04 is here.
In the last episode we talked about asset authoring in USD and Solaris. I spent many hours after that publishing all the assets from Aninmal Logic's lab scene using my asset creation HDA, in the way that I like to publish assets. Now that everything is ready we will move on to the next stages of the pipeline.

In this video we will talk about assembly, the process where we create a set using all the available assets created before. Solaris has multiple tools for assembling scenes, including references, the stage manager, the layout tool, the drop tool, instances, scatterers, etc. We will look into all of those.

Once the assembly is done, we will look into shot setups, where we will establish the structure of a shot, including all the elements that will be needed later on. Part of this process is also layout and set dressing, where we will be creating cameras a shot specific overrides.

We will publish a few USD layers that will be referenced by the animation department. In this step of the pipeline we will look into how to author animation directly in Solaris and also how to import USD animated caches coming from different DCCs to be used in a shot.

Another 3 plus hours of professional USD training plus a big data set ready to be used in Houdini Solaris.

All the info on my Patreon website.

Thanks!
Xuan.

Professional photogrammetry 01 /  by Xuan Prada

Hello patrons,

Let's take a break from the USD training, we'll come back to it in the next video.
For now, let's enjoy a 4 hours video about professional photogrammetry.
I reckon this will be a short series, maybe 3 videos about photogrammetry acquisition and processing.

In today's video we will talk about cross polarization in a controlled environment for capturing 3D assets. We will discuss how polarization works, camera gear, how to take photos properly and how to process the data to create nice looking assets for VFX and real time.

All the information on my Patreon.

I hope you like it.
Thanks!
Xuan.

USD in depth, part 03 /  by Xuan Prada

Hello patrons!

USD in depth part 03 is here. This is where the action starts to happen.
We will spend around 3 hours in Houdini Solaris talking about asset creation.

I have a bunch of different scenarios that you will face while working with USD and assets. From very simple assets to more complicated ones with multiple variations for geometry and lookdev.

While exploring all the different options, we will create a re-usable template that you can use to standardize all your assets very quickly. We will also take a look at the component builder provided with the latest versions of Solaris that can also help you to prototype assets quickly.

As I said, about 3 hours of professional USD content that I'm hoping it can be useful for you when dealing with USD in the future.

This is the third video in a row about USD. Still a bunch of videos left to cover everything that I want to cover about USD at this point. But I'm thinking that we should take a break from USD in the next video. I know not everyone is super keen to learn USD (but you should!). I was planning to do one or two videos about professional photogrammetry, covering cross polarization and multiple cameras setup, surface scanning for PBR materials, drone photogrammetry and photometric capturing. Let me know what you think.

All the info on my Patreon site.

Thanks!

Xuan.

USD in depth, part 02 /  by Xuan Prada

Hello patrons,

USD in depth part 02 is here.
This is another dense video, about 3 hours long talking about USD.
In the first video we talked about data and structuring, in this second video we will be talking about composition in USD.

USD layers can be written and read in different ways, it is very important to know how to use the different composition arcs, specifiers, and everything else that composes a USD file. This will dictate the way you structure your assets and your whole USD pipeline.

Another heavy video, so be patient and drink coffe, you will need both.

All the info on my Patreon.

Thanks!
Xuan.

USD in depth, part 01 /  by Xuan Prada

Hello Patrons,

I'm starting a new series called "USD in depth", where I will be exploring everything USD related. As you probably know USD is a new standard pipeline system/file format based on layers that contain scene descriptions. It is supported by the VFX platform and is or will be the core of many visual effects studios and animation companies around the globe.

In this first video (more than 3 hours) we will be talking about what defines USD. Type of data, USD structure, terminology, attributes and layers. This is a very dense video, so grab a pot of coffee and enjoy.

All the info on my Patreon.

Thanks,
Xuan.

Deep compositing - going deeper /  by Xuan Prada

Hello patrons,

This is a continuation of the intro to deep compositing, where we go deeper into compositing workflows using depth.

I will show you how to properly use deep information in a flat composition, to work fast and efficient with all the benefits of depth data but none of the caveats.

The video is more than 3 hours long and we will explore:

- Quick recap of pros and cons of using deep comp.
- Quick recap of basic deep tools.
- Setting up render passes in a 3D software for deep.
- Deep holdouts.
- Organizing deep comps.
- How to use AOVs in deep.
- How to work with precomps.
- Creating deep templates.
- Using 3D geometry in deep.
- Using 2D elements in deep.
- Using particles in deep.
- Zdepth using depth information.

Thanks for your support!
Head over to my Patreon for all the info.

Xuan.

Mix 04 /  by Xuan Prada

Hello patrons,

First video of 2022 will be a mix of topics.

The first part of the video will be dedicated to talk about face building and face tracking in Nuke. Using these tools and techniques will allow us to generate 3D heads and faces using only a few photos with the help of AI. Once we have the 3D model, we should be able to track and matchmove a shot to do a full head replacement or to extend/enhance some facial features.

In the second part of the video I will show you a technique that I used while working on Happt Feet to generate foot prints and foot trails. A pretty neat technique that relies on transferring information between surfaces instead of going full on with complex simulations.

This is a 3.30 hours video, so grab yourself a cup of coffee and enjoy!
All the information on my Patreon channel.

As always, thanks for your support!

Xuan.

Scan based materials on a budget /  by Xuan Prada

Hello patrons,

Last post of the year!

In this two and half hours video I will show you my workflow to create smart materials based on photogrammetry. A technique wideky used in VFX and the game industry.

But we won't be using special hardware or very expensive photographic equipment, we are going to be using only a cheap digital camera or even a smartphone.

In this video you will learn:

- How to shoot photogrammetry for material creation.
- How to process photogrammetry in Reality Capture.
- How to bake textures maps from high resolution geometry in Zbrush.
- How to create smart materials in Substance Designer for Substance Painter or for 3D applications.
- How to use photogrammetry based materials in real time engines.

Thanks for your support and see you in 2022!
Stay safe.

Xuan.

VDB as displacement /  by Xuan Prada

The sphere is the surface that needs to be deformed by the presence of the cones. The surface can't be modified in any way, we need to stick to its topology and shape. We want to do this dynamically just using a displacement map but of course we don't want to sculpt the details by hand, as the animation might change at any time and we would have to re-sculpt again.

The cones are growing from frame 0 to 60 and moving around randomly.

I'm adding a for each connected piece and inside the loop adding an edit to increase the volume of the original cones a little bit.

Just select all in the group field, and set the transform space to local origin by connectivity, so each cone scales from it's own center.

Add a vdb from polygons, set it to distance VDB and add some resolution, it doesn't need to be super high.

Then I just cache the VDB sequence.

Create an attribute from volume to pass the Cd attribute from the vdb cache to the sphere.

To visualize it better you can just add a visualizer mapped to the attribute.

In shading, create an user data float and read the Cd attribute and connect it to the displacement.

If you are looking for the opposite effect, you can easily invert the displacement map.

Dealing with lidars /  by Xuan Prada

Hello patrons,

We haven't talked that much about lidar scanning, and it is time to say a few words about it. Lidar scans are a fundamental piece of the VFX pipeline, used by every single visual effects studio on the planet and counted by dozens on every film or tv show.

Sooner or later you would have to deal with lidar scans, that's why I have recorded this video, more than 3 hours of professional vfx training about how to use lidars scans.

In this video we will learn:

- What is lidar scanning.
- How we use lidars in VFX.
- How lidar technology works.
- Basics of working on-set with lidars.
- Lidar hardware.
- Lidar software.
- How to process point clouds.
- How to generate meshes for 3D work.

All the information on my Patreon feed.

Thanks!

Xuan.

Detailing digi doubles using generic humans /  by Xuan Prada

This is probably the last video of the year, let's see about that.

This time is all about getting your concept sculpts into the pipeline. To do this, we are going to use a generic humanoid, usually provided by your visual effects studio. This generic humanoid would have perfect topology, great uv mapping, some standard skin shaders, isolation maps to control different areas, grooming templates, etc.

This workflow will speed drastically the way you approach digital doubles or any other humanoid character, like this zombie here.

In this video we will focus mainly on wrapping a generic character around any concep sculpt to get a model that can be used for rigging, animation, lookdev, cfx, etc. And once we have that, we will re-project back all the details from the sculpt and we will apply high resolution displacement maps to get all the fine details like skin pores, wrinkles, skin imperfections, etc.

The video is about 2 hours long and we can use this character in the future to do some other videos about character/creature work.

All the info on my Patreon site.

Thanks!

Xuan.

Deep compositing /  by Xuan Prada

Hello patrons,

In this 2 hour video we are going to be talking about deep compositing workflows.

I will show you how to use deep compositing and why you should be using it for most of your shots.
I will explain the basics behind deep rendering and compositing techniques and also we'll go through all the deep tools available in Nuke while comping some simple shots. From volumes and atmospheric effects to solid assets.

Video and downloadable material will be included in the next posts.
All the information on my Patreon.

Thanks for your support!

Xuan.

Lookdev rig for Houdini /  by Xuan Prada

Hello patrons,

In this video I show you how to create a production ready lookdev rig for Houdini, or what I like to call, a single click render solution for your lookdevs.

It is in a way similar to the one we did for Katana a while ago, but using all the power and flexibility of Houdini's HDA system.

Talking about HDA's, I will be introducing the new features for HDA's that come with Houdini 18.5.633 that I think are really nice, specially for smaller studios that don't have enough resources to build a pipeline around HDA's.

By the end of this video you should be able to build your own lookdev tool and adapt it to the needs of your projects.

We'll be working with the latest versions of Houdini, Arnold and ACES.

As usually, the video starts with some slides where I try to explain why building a lookdev rig is a must before you do any work on your project, don't skip it, I know it is boring but very much needed. Downloadable material will be attached in the next post.

Thank you very much for your support!

Head over to my Patreon feed.

Xuan.

Small dynamic clouds /  by Xuan Prada

Hello,

I don't think I will be able to publish a video this month, let's see, but in the meantime here you can download five caches of small dynamic clouds that I simulated in Houdini.
They are a 1000 frames simulation and should work pretty good to create vast cloudscapes.

They are .bgeo caches, feel free to convert them to .vdb if you want to use them in any other software.


The videos below are flipbooks of the animated clouds, not renders.

The downloadable link will be published in the next post.
This is free of charge for all tiers with downloadable resources.

Thanks,
Xuan.

Mix 03 /  by Xuan Prada

Hello patrons,

This month I have another mix video for you. In this case I'm talking about two different ways of using the camera frustum to optimize your scenes. The first method is using the camera frustum to control the amount of subdivisions, a very common practice when dealing with large terrains that need a lot of displacement detail. We will use Houdini and Arnold, but this technique can be used in any DCC that supports Arnold. Other renderers have similar features.

The second method will use the camera frustum to blast parts of the scene not seeing by the camera. This is a tool that we will build in Houdini and can be used with any render engine.

Then we will move to another important topic in VFX, motion blur. I will show you how to use it properly to achieve photo realism. Motion blur should be taken very siriously, specially by lighters and FX TD's.

All the information on my Patreon.

Thanks!
Xuan.