ECGS: Extinction Coordination for Enhanced Gaussian Splatting

Gaussian Splatting has emerged as a prominent technique in computer vision and graphics, enabling high-fidelity scene reconstruction from a vast collection of 3D Gaussian primitives. Each primitive's appearance is governed by a viewindependent opacity parameter and a view-dependent color derived from spherical harmonics. A fundamental challenge, however, lies in the non-unique and heterogeneous nature of this parameterization, which limits physical plausibility and degrades expressiveness. To address this, we introduce the Extinction Coordinator for Gaussian Splattings (ECGS), which enforces a crucial consistency: a Gaussian's intrinsic opacity must align with its maximum alpha blending weight observed across all views. This constraint effectively encourages primitives to distribute along thin, surface-like shells, thereby enhancing the representation's expressiveness. Furthermore, we propose an anisotropic morphology regularization to promote planar Gaussian shapes while suppressing elongated, needle-like artifacts, leading to a more compact model. Extensive experiments on multiple benchmarks demonstrate that our approach reduces the Gaussian count by up to 75% while simultaneously boosting geometric accuracy and rendering speed. As a lightweight and modular component, ECGS can be seamlessly integrated into existing Gaussian Splatting pipelines. Code is available at: https://anonymous.4open.science/r/ECGS-F774.