Hoetzlein, RamaChristie, MarcPietroni, NicoWang, Yu-Shuen2025-10-072025-10-0720251467-8659https://doi.org/10.1111/cgf.70235https://diglib.eg.org/handle/10.1111/cgf70235Displacement 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 introduce projective displacement mapping as a direct sampling method combined with a hardware BVH. Quality and performance are improved over existing methods with smoothed displaced normals, thin feature sampling, tight prism bounds and ray bi-linear patch intersections.Attribution 4.0 International LicenseCCS Concepts: Computing methodologies → Ray tracing; Parametric curve and surface models; Mesh modelsComputing methodologies → Ray tracingParametric curve and surface modelsMesh models10.1111/cgf.7023513 pages