What Project Violet is
Project Violet is a tutorial series made in Houdini 21, of the “Intermediate” Level, by Sam Taylor. The series shows new character features and workflows in Houdini 21 while combining the production readiness of Epic’s MetaHuman system with Houdini rigging and simulation workflows to build an approachable full human workflow.
That matters because it narrows the promise. This is not a inspiration reel, but a character pipeline exercise, with the character coming from MetaHuman and the heavy lifting happening in Houdini. If your day job sits anywhere near character setup, deformation, or character-adjacent sims, Project Violet wants to show you how to reuse, get a decent iteration speed, and getting a believable human through a procedural toolset without constantly falling back to manual rig babysitting.
The pipeline pitch: MetaHuman base, Houdini control
The main idea: take MetaHuman as the starting point and use Houdini for rigging and simulation versatility. It calls MetaHuman “production-ready” (we could discuss that, yet, the character is still in intensive care), and it presents that as the baseline you inherit rather than something you rebuild. Everything after that becomes a question of how far you can push Houdini’s character toolset once you stop spending weeks on initial asset authoring.
A separate SideFX-side (hehehe) for Project Violet describes it as an evolution of an earlier character-centric project, and it wants to focus on greater realism and expanded capability of the character, to showcase Houdini rigging and animation capabilities updated for new features and efficiencies in Houdini 21, and demonstrate a character pipeline that emphasises proceduralism while using MetaHumans as a base for the workflow.
That language is still a pitch, but it dosn’t widen the scope. The project is about a workflow, not a single solver trick. It aims to demonstrate procedural character work in Houdini 21 with a MetaHuman starting point.
One practical caveat: none of these claims your exact studio constraints, problems and idiosyncrasies of the colleagues get solved. Your skeleton naming rules, mesh structure, and export requirements still exist. Project Violet shows a route, not a universal treaty.
Houdini character tooling under the hood: APEX Autorig Builder
If Project Violet is the show, the APEX Autorig Builder is one of the stagehands. The APEX Autorig Builder SOP is a tool to interactively apply and configure pre-built and custom rig components through the viewport, which aims to make character setup more intuitive and lets you quickly build a complete rig.
SideFX draws a line between the APEX Autorig Builder SOP and the APEX Autorig Component SOP. The Builder can add multiple rig components, supports interactive viewport rigging, and allows modifying a limited set of component parameters in the viewport. The Component SOP adds one rig component at a time, can be used to create custom components, and exposes the full set of parameters in the parameter editor.
Back to Project Violet, because it glues the workflow in Houdini’s modular rig component approach rather than a one-off rig graph built for a single hero asset. Even if you do not adopt the exact tutorial approach, those constraints and mechanics tell you what Houdini 21 expects when you try to scale character setup.
Unreal and MetaHuman side of the bridge
Project Violet ties into Unreal. Epic’s MetaHuman are tools to assemble a MetaHuman character or create MetaHuman-compatible grooms in SideFX Houdini.
That tells you two things. First, the pipeline is not only about ex/im-porting Alembic and hoping for the best. It involves a toolset that lives in the Unreal ecosystem but targets Houdini as the working environment for certain tasks. Second, the workflow depends on version compatibility and installation details that can change across engine builds, pipeline images, and studio IT lockdowns.
This is where the series may appeal to teams that want to get to motion and deformation problems quickly, or to studios that already standardised on MetaHuman for certain classes of characters and now want deeper procedural control on top.
Either way, run a controlled wokrflow test before you bet a show schedule on it.
https://www.sidefx.com/tutorials/project-violet/
https://www.sidefx.com/docs/houdini/character/kinefx/autorigbuilder.html
https://dev.epicgames.com/documentation/metahuman/metahuman-for-houdini
