SMPL: A skinned multi-person linear model

M Loper, N Mahmood, J Romero, G Pons-Moll… - … Papers: Pushing the …, 2023 - dl.acm.org
Seminal Graphics Papers: Pushing the Boundaries, Volume 2, 2023dl.acm.org
We present a learned model of human body shape and posedependent shape variation that
is more accurate than previous models and is compatible with existing graphics pipelines.
Our Skinned Multi-Person Linear model (SMPL) is a skinned vertexbased model that
accurately represents a wide variety of body shapes in natural human poses. The
parameters of the model are learned from data including the rest pose template, blend
weights, pose-dependent blend shapes, identity-dependent blend shapes, and a regressor …
We present a learned model of human body shape and posedependent shape variation that is more accurate than previous models and is compatible with existing graphics pipelines. Our Skinned Multi-Person Linear model (SMPL) is a skinned vertexbased model that accurately represents a wide variety of body shapes in natural human poses. The parameters of the model are learned from data including the rest pose template, blend weights, pose-dependent blend shapes, identity-dependent blend shapes, and a regressor from vertices to joint locations. Unlike previous models, the pose-dependent blend shapes are a linear function of the elements of the pose rotation matrices. This simple formulation enables training the entire model from a relatively large number of aligned 3D meshes of different people in different poses. We quantitatively evaluate variants of SMPL using linear or dual-quaternion blend skinning and show that both are more accurate than a Blend- SCAPE model trained on the same data. We also extend SMPL to realistically model dynamic soft-tissue deformations. Because it is based on blend skinning, SMPL is compatible with existing rendering engines and we make it available for research purposes.
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