Computer Graphics Forum (Proceedings of Eurographics)

Axis‐Normalized Ray‐Box Intersection

Fabian Friederichs, Steve Grogorick, Elmar Eisemann, Marcus Magnor, and Martin Eisemann

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Ray-axis aligned bounding box intersection tests play a crucial role in the runtime performance of many rendering applications, driven not by complexity but mainly by the volume of tests required. While existing solutions were believed to be pretty much optimal in terms of runtime on current hardware, our paper introduces a new intersection test requiring fewer arithmetic operations compared to all previous methods. By transforming the ray, we eliminate the need for one third of the traditional bounding-slab tests and achieve a speed enhancement of approximately 13.8% or 10.9%, depending on the compiler. We present detailed runtime analyses in various scenarios.

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@article{bib:friederichs:2025,
    author       = { Friederichs, Fabian and Grogorick, Steve  and Eisemann, Elmar and Magnor, Marcus and Eisemann, Martin },    
    title        = { Axis‐Normalized Ray‐Box Intersection },
    journal      = { Computer Graphics Forum (Proceedings of Eurographics) },
    year         = { 2025 },
    publisher    = { Wiley },
    doi          = { 10.1111/cgf.70041 },
    url          = { https://publications.graphics.tudelft.nl/papers/825 },
}