Author

Vitor Matias

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Preprint Oct 2026

PCAsplat: Gaussian Splatting with Local PCA Regularization

Gaussian splatting has emerged as a flexible representation for 3D reconstruction from posed images. However, existing methods are optimized primarily using rasterization-based losses, which supervise a splat only when it contributes to sampled camera rays. Gaussians that are occluded or contribute little to the sample...

Vitor Matias, Filipe Nascimento, Kiyohiro Nakayama et al. · 0 citations

Preprint Aug 2026

3D-MRL: Nested Multimodal 3D Representations via Matryoshka Representation Learning

Vision-Language Models align point clouds with image and text embeddings, enabling zero-shot recognition, retrieval, and open-vocabulary understanding of 3D shapes. Existing multimodal 3D pre-training methods produce fixed-dimensional embeddings, requiring separate models for different computational budgets. We propose...

M. Lobo, Vitor Matias, Jeová Farias et al. · 1 citation