Patent ID: 11928851
Assignee: CARL ZEISS VISION INTERNATIONAL GMBH
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. The computer implemented method as claimed in claim 12, further comprising the following steps:
parameterizing the four-dimensional angular component of the reflectance distribution function (SVBRDF) using a Rusinkiewicz parameterization such that a polar angle (Θh) and an azimuth angle (Φh) of a halfway vector ({right arrow over (h)}) and a polar angle (Θd) and an azimuth angle (Φd) of a difference vector ({right arrow over (d)}) are available as the transformed coordinate axes, where the halfway vector ({right arrow over (h)}) is the halfway vector between the incident ray and the reflected ray and the difference vector ({right arrow over (d)}) is the difference between the incident ray and the halfway vector ({right arrow over (h)}),
discretizing the space spanned by the transformed coordinate axes using a coordinate grid structure with grid points, with the grid spacing for the polar angle (Θh) coordinate axis of the halfway vector ({right arrow over (h)}) being less than the grid spacing for the remaining transformed coordinate axes (Φh, Θd, Φd).