Nicolás Violante Grezzi

I'm currently a postdoc at Imagine, École Nationale des Ponts et Chaussées, working with Vincent Lepetit. I completed my Ph.D. at Inria Sophia Antipolis with the GraphDeco group, supervised by George Drettakis.

I earned my master's degree in Mathematics, Vision, and Learning from ENS Paris-Saclay, graduating with highest honors (mention très bien). I also earned a degree in Electrical Engineering from Universidad de la República in Uruguay.

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News

I started a postdoc at Imagine, École Nationale des Ponts et Chaussées, working with Vincent Lepetit.

Invited talk at Centre Borelli.

Our paper Splat and Replace: 3D Reconstruction with Repetitive Elements was accepted at SIGGRAPH 2025.

I started an internship at Adobe, San Francisco, under the supervision of Thibault Groueix.

Research

A category-agnostic optimization framework that recovers 3D kinematics of articulated objects from monocular video by fitting geometric primitives organized via joint constraints.

A diffusion-based harmonization approach that transfers objects between 3DGS scenes by correcting the illumination of the objects and adding matching shadows and reflections.

We leverage repetitive elements in 3D scenes — segmenting, registering, and sharing information across repeated instances in a 3DGS reconstruction — to improve novel view synthesis quality under poor coverage and occlusions.

A 3D GAN framework for multi-view coherent 360° car synthesis with disentangled reflectance, enabling interactive relighting with arbitrary environment maps.

Design inspired by Jon Barron's website.