BRDFtietokanta

BRDFtietokanta is a repository that collects Bidirectional Reflectance Distribution Function (BRDF) data describing how surfaces reflect light. It typically contains measured and/or synthetic BRDF samples for a variety of materials, under different illumination and viewing geometries, and often across multiple wavelengths. The database serves as a resource for computer graphics, vision research, and material science to model surface appearance in a physically plausible way.

Entries in a BRDFtietokanta include material identity (for example metals, plastics, fabrics), measurement conditions, instruments used (such as spectro-gonio meters or gonioreflectometers), angular sampling, spectral range, and units. BRDF data are commonly represented as f_r(ω_i, ω_r, λ) or through per-wavelength or RGB approximations, and may also be provided as fitted models or tabulated samples. Metadata supports filtering by material type, roughness, anisotropy, and measurement accuracy.

Formats and access vary, with some databases following standard BRDF data formats and including well-known datasets (for example, MERL) as references. BRDFtietokanta may offer downloadable datasets, programmatic access, and documentation on licensing, usage rights, and citation requirements. Quality considerations include calibration procedures, sample preparation, and reproducibility of measurements.

Applications include physically-based rendering, spectral rendering, material appearance research, and material library development. By providing a centralized collection of BRDF measurements, BRDFtietokanta facilitates comparison of materials, validation of shading models, and the reproduction of real-world appearances in digital environments.