Katana

Katana Fastrack episode 04 by Xuan Prada

Katana Fastrack episode 04 is already available.
In this episode, we will finish the Ant-Man lookDev by tweaking all the shaders and texture maps created in Mari.

Then we will do a very quick slapcomp in Katana and Nuke to check that everything works as expected and looks good. We will do this by render a full motion range of Ant-Man walk cycle. And finally, we will write a Katana look file to be used by the lighters in their shots.

Check it out on my Patreon feed.

Katana Fastrack episode 03 by Xuan Prada

Episode 03 of my Katana series is out. We are going to be talking about expressions, macros and tools to take our look-dev template to the next level. Right after that, we will take a look at the texture channels that I painted in Mari for this character and then we will start the look-dev of Ant-Man.

We divide the look-dev in different stages, the first on is blocking, and we are going to spend quite a few time working on this today.

All the info on my Patreon feed.

Katana Fastrack episode 02 by Xuan Prada

Katana Fastrack episode 02 is now available for all my patrons. I cover how to create a proper look-dev template to be used in visual effects. Everything will be setup from scratch and at the end of this lesson we will have a Katana script ready to be used. In lesson 03 we'll be using this script to do all the look-dev for Ant-Man.

In Katana Fastrack episode 02 you will learn:

- How to create master look files
- How to use live groups to create light rigs
- How to create a look-dev template for production

All the info on my Patreon feed.

Katana Fastrack episode 01 by Xuan Prada

Here it is, the very first episode of my series "Katana Fastrack", available to all my exclusive patrons.
This is an introductory video where I'm going to give you an overview of what this course is all about. I hope you like it, it is going to be a lof of fun!

You will learn:

- Where Katana fits in the pipeline
- The most important concepts of Katana's workflow
- How to prepare assets for Katana
- The importance of look-dev recipes
- How to create a very basic recipe

Check it out on my Patreon feed.

Katana, constraint lights to an alembic geometry by Xuan Prada

One of the most common situations while lighting a shot is attaching a CG light in your scene assembler to an alemic cache exported from Maya. This is very simple to do in Katana, let’s have a look at it.
I’m using this simple animation of a car spining around.

01.gif

In most cases you need an object within the alembic cache that has the animation baked into it. The usual approach is to use a locator. To do so, snap it onto one of the lights geometry of the car and parent constrain it to the master control of the car. Then bake the animation of the locator and export it with the rest of the alembic cache to Katana.

In Katana, create a gafferThree node but do not place any lights yet. It is better to do the constraints first, if not you might have to deal with offset issues later on.
Use a parentChildConstraint node indicating the gaffer node in the basePath and the locator of the car in the target.

Now place both headlights according with the model of the car. If you press play they should follow the animation of the car perfectly.

04.gif

In case you forget to do the parentConstraint before adding lights to the gaffer, you might have to control the offset and compensate for it. To actually see the values you can add constraintResolve and a transformEdit to check the transformations.