Search Results for author: Nicholas Sharp

Found 13 papers, 5 papers with code

Neurally Integrated Finite Elements for Differentiable Elasticity on Evolving Domains

no code implementations12 Oct 2024 Gilles Daviet, Tianchang Shen, Nicholas Sharp, David I. W. Levin

We present an elastic simulator for domains defined as evolving implicit functions, which is efficient, robust, and differentiable with respect to both shape and material.

3D Reconstruction Numerical Integration

SpaceMesh: A Continuous Representation for Learning Manifold Surface Meshes

no code implementations30 Sep 2024 Tianchang Shen, Zhaoshuo Li, Marc Law, Matan Atzmon, Sanja Fidler, James Lucas, Jun Gao, Nicholas Sharp

In particular, our vertex embeddings generate cyclic neighbor relationships in a halfedge mesh representation, which gives a guarantee of edge-manifoldness and the ability to represent general polygonal meshes.

Stochastic Optimization

3D Gaussian Ray Tracing: Fast Tracing of Particle Scenes

no code implementations9 Jul 2024 Nicolas Moenne-Loccoz, Ashkan Mirzaei, Or Perel, Riccardo de Lutio, Janick Martinez Esturo, Gavriel State, Sanja Fidler, Nicholas Sharp, Zan Gojcic

The benefits of ray tracing are well-known in computer graphics: processing incoherent rays for secondary lighting effects such as shadows and reflections, rendering from highly-distorted cameras common in robotics, stochastically sampling rays, and more.

Simplicits: Mesh-Free, Geometry-Agnostic, Elastic Simulation

no code implementations9 Jun 2024 Vismay Modi, Nicholas Sharp, Or Perel, Shinjiro Sueda, David I. W. Levin

The proliferation of 3D representations, from explicit meshes to implicit neural fields and more, motivates the need for simulators agnostic to representation.

Adaptive Shells for Efficient Neural Radiance Field Rendering

no code implementations16 Nov 2023 Zian Wang, Tianchang Shen, Merlin Nimier-David, Nicholas Sharp, Jun Gao, Alexander Keller, Sanja Fidler, Thomas Müller, Zan Gojcic

We then extract an explicit mesh of a narrow band around the surface, with width determined by the kernel size, and fine-tune the radiance field within this band.

Novel View Synthesis Stochastic Optimization

TexFusion: Synthesizing 3D Textures with Text-Guided Image Diffusion Models

no code implementations ICCV 2023 Tianshi Cao, Karsten Kreis, Sanja Fidler, Nicholas Sharp, Kangxue Yin

We present TexFusion (Texture Diffusion), a new method to synthesize textures for given 3D geometries, using large-scale text-guided image diffusion models.

Denoising Game Design +1

Flexible Isosurface Extraction for Gradient-Based Mesh Optimization

1 code implementation10 Aug 2023 Tianchang Shen, Jacob Munkberg, Jon Hasselgren, Kangxue Yin, Zian Wang, Wenzheng Chen, Zan Gojcic, Sanja Fidler, Nicholas Sharp, Jun Gao

This work considers gradient-based mesh optimization, where we iteratively optimize for a 3D surface mesh by representing it as the isosurface of a scalar field, an increasingly common paradigm in applications including photogrammetry, generative modeling, and inverse physics.

ATT3D: Amortized Text-to-3D Object Synthesis

no code implementations ICCV 2023 Jonathan Lorraine, Kevin Xie, Xiaohui Zeng, Chen-Hsuan Lin, Towaki Takikawa, Nicholas Sharp, Tsung-Yi Lin, Ming-Yu Liu, Sanja Fidler, James Lucas

Text-to-3D modelling has seen exciting progress by combining generative text-to-image models with image-to-3D methods like Neural Radiance Fields.

Image to 3D Object +1

Data-Free Learning of Reduced-Order Kinematics

1 code implementation5 May 2023 Nicholas Sharp, Cristian Romero, Alec Jacobson, Etienne Vouga, Paul G. Kry, David I. W. Levin, Justin Solomon

Physical systems ranging from elastic bodies to kinematic linkages are defined on high-dimensional configuration spaces, yet their typical low-energy configurations are concentrated on much lower-dimensional subspaces.

VectorAdam for Rotation Equivariant Geometry Optimization

no code implementations26 May 2022 Selena Ling, Nicholas Sharp, Alec Jacobson

We demonstrate this approach on problems in machine learning and traditional geometric optimization, showing that equivariant VectorAdam resolves the artifacts and biases of traditional Adam when applied to vector-valued data, with equivalent or even improved rates of convergence.

BIG-bench Machine Learning

Spelunking the Deep: Guaranteed Queries on General Neural Implicit Surfaces via Range Analysis

1 code implementation5 Feb 2022 Nicholas Sharp, Alec Jacobson

Neural implicit representations, which encode a surface as the level set of a neural network applied to spatial coordinates, have proven to be remarkably effective for optimizing, compressing, and generating 3D geometry.

3D geometry Inverse Rendering

DiffusionNet: Discretization Agnostic Learning on Surfaces

4 code implementations1 Dec 2020 Nicholas Sharp, Souhaib Attaiki, Keenan Crane, Maks Ovsjanikov

We introduce a new general-purpose approach to deep learning on 3D surfaces, based on the insight that a simple diffusion layer is highly effective for spatial communication.

PointTriNet: Learned Triangulation of 3D Point Sets

1 code implementation ECCV 2020 Nicholas Sharp, Maks Ovsjanikov

This work considers a new task in geometric deep learning: generating a triangulation among a set of points in 3D space.

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