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MetaHuman Framework and Machine Learning for Next-Gen Character Deformation

Raffaele Fragapane, Matt Stoneham

Epic Games demonstrated end-to-end MetaHuman assembly and the UE5 ML Deformer workflow, training networks on full muscle, flesh, and cloth simulation data to approximate high-fidelity deformation at runtime.

Abstract

Epic Games walks through the MetaHuman framework and a UE5 ML Deformer workflow for high-fidelity real-time body deformation. Rafael covers MetaHuman Creator, mesh to MetaHuman, the MetaHuman DNA format with DNA Calib, Rig Logic facial rigging in semantic space, and MetaHuman Animator for footage-based facial performance capture. Matt then shows training neural networks on full muscle, flesh and cloth simulation generated in Houdini for an anatomically correct digidouble (built from 3D scans and MRI), compressing dynamic sim deltas into learned morph targets that run in real time on PS5. He details the neural morph model (local versus global, bone associations) for flesh and the nearest neighbor model with PCA and K-means pose generation for cloth, plus training range-of-motion authoring, twist joints, and the in-editor training and testing UI.

How to read this

Category
Production talk: MetaHuman framework and a UE5 ML Deformer workflow
Contributions
  • Walkthrough of the end-to-end MetaHuman framework: Creator, mesh-to-MetaHuman, the DNA format with DNA Calib, Rig Logic facial rigging, and MetaHuman Animator
  • Demonstrates training neural networks on full muscle, flesh, and cloth simulation (authored in Houdini) to compress dynamic sim deltas into learned morph targets running in real time on PS5
  • Details a neural morph model (local vs global, bone associations) for flesh and a nearest-neighbor PCA/K-means model for cloth, plus range-of-motion authoring and in-editor training/testing UI
Context
Builds on deformation-approximation work such as Fast and Deep Deformation Approximations, productionizing learned deformation inside Unreal Engine 5.Builds on: Fast and Deep Deformation Approximations
Correctness
Studio practice, not peer-reviewed; results are production-proven on a specific anatomically correct digidouble (scans plus MRI) and target hardware (PS5), so numbers and quality reflect that pipeline rather than a controlled benchmark.
Clarity
Practitioner-facing and concrete; a single pass conveys the workflow, rewatch specific segments for the ML Deformer model details.
How to read it
Watch once end-to-end for the toolchain map, then revisit the ML Deformer (flesh neural morph and cloth PCA/K-means) and ROM-authoring sections if building a similar real-time deformation pipeline.

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