面向光线追踪可编辑曲面的投影位移映射
Projective Displacement Mapping for Ray Traced Editable Surfaces
AI总结：
本文提出投影位移映射方法，通过直接采样结合顶层硬件BVH，无需底层加速结构，在实时光线追踪中实现高质量可编辑曲面建模，性能优于现有方法。
摘要：
位移映射是建模精细几何特征的重要工具。我们探索了在交互式光线追踪过程中创作复杂曲面的问题。当前用于光线追踪位移曲面的技术依赖于加速结构，这些结构在编辑时需要动态重建。这些技术通常用于大规模静态场景或详细源资产的压缩。我们的兴趣在于利用实时光线追踪进行艺术特征的建模与外观开发。我们展示了投影位移映射，这是一种直接采样方法，无需底层加速结构，并与顶层硬件BVH相结合。通过平滑位移法线、薄特征采样、紧密棱柱边界以及光线-双线性面片求交，质量与性能相较于现有方法得到了提升。我们的方法比可比的光线追踪方法更快，从而实现了实时曲面编辑。
英文摘要：
Displacement mapping is an important tool for modeling detailed geometric features. We explore the problem of authoring complex surfaces while ray tracing interactively. Current techniques for ray tracing displaced surfaces rely on acceleration structures that require dynamic rebuilding when edited. These techniques are typically used for massive static scenes or the compression of detailed source assets. Our interest lies in modeling and look development of artistic features with real-time ray tracing. We demonstrate projective displacement mapping, a direct sampling method without a bottom-level acceleration structure combined with a top-level hardware BVH. Quality and performance are improved over existing methods with smoothed displaced normals, thin feature sampling, tight prism bounds and ray-bilinear patch intersections. Our method is faster than comparable approaches for ray tracing, enabling real-time surface editing.
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