用光线追踪改进高斯溅射，实现真实光照与阴影效果。
RaySplats: Ray Tracing based Gaussian Splatting
- 基于光线追踪直接处理高斯椭球体，替代传统投影渲染。
- 可融合网格模型并添加灯光、阴影等真实感视觉效果。
- 适合需要高质量光影渲染的3D重建与可视化应用。
3D高斯溅射（3DGS）能从2D图像直接生成3D物体，具有训练与渲染速度快的优势。然而，由于采用光栅化而非光线追踪进行渲染，3DGS难以实现光照与阴影效果。本文提出RaySplats，一种基于光线追踪的高斯溅射方法。该方法不依赖高斯分布的投影，而是直接在由置信椭球和RGB颜色表示的高斯原语上执行光线追踪。通过计算光线与椭球的相交关系构建光线追踪算法，支持将网格模型与高斯溅射模型结合，并实现灯光、阴影等真实感视觉效果。
原文摘要 · Abstract (English)
3D Gaussian Splatting (3DGS) is a process that enables the direct creation of 3D objects from 2D images. This representation offers numerous advantages, including rapid training and rendering. However, a significant limitation of 3DGS is the challenge of incorporating light and shadow reflections, primarily due to the utilization of rasterization rather than ray tracing for rendering. This paper introduces RaySplats, a model that employs ray-tracing based Gaussian Splatting. Rather than utilizing the projection of Gaussians, our method employs a ray-tracing mechanism, operating directly on Gaussian primitives represented by confidence ellipses with RGB colors. In practice, we compute the intersection between ellipses and rays to construct ray-tracing algorithms, facilitating the incorporation of meshes with Gaussian Splatting models and the addition of lights, shadows, and other related effects.
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