Editing Cornell box (section)

=== Scene data ===
[[File:Cornell Box (flipped) and camera parameters.stl|thumb|left|100px|3D Cornell box model]]
The original geometry data supplied by Cornell University clearly defines the positions of the objects, with the tall block on the right and the short block on the left, as shown in the [[Cornell box#Hemi-Cube Form Factors|Hemi-Cube Form Factors section]]. While 3D applications and algorithms may interpret axes differently, causing potential confusion, this does not affect the specific misconception in this case. We have direct access to the original data, and although we understand the correct configuration, it's unclear why a mirrored version (flipped along one axis) is more prominently used.

This change was first observed in the '[[Cornell box#Spherical Harmonics|Spherical Harmonics]]' rendition of the box. Although the authors did not explicitly comment on this change, a plausible explanation could be that without the flipped layout and repositioned camera, the uneven reflection on the tall block would be too distracting. Additionally, if the green wall were visible in the reflection, it would not contrast as strongly as the red wall does on the white background.<ref group="𝓲">Examples can be viewed in [[#Photographic Images]] section.</ref> Repositioning the objects and camera could be a more efficient solution than recreating and repainting the entire box.

An accurate method for setting up the camera according to the original specifications is to set the focal length to 35mm and the sensor size (film gate) to 25mm. Alternative setup methods, including the camera's position, rotation, and other relevant details, are provided in the description of the 3D Cornell Box model featured in this section. The alternative coordinates that could be used to reproduce the repositioned camera were never published.