Models
BRDFs can be measured directly from real objects using calibrated cameras and lightsources; however, many phenomenological and analytic models have been proposed including the Lambertian reflectance model frequently assumed in computer graphics. Some useful features of recent models include:
- accommodating anisotropic reflection
- editable using a small number of intuitive parameters
- accounting for Fresnel effects at grazing angles
- being well-suited to Monte Carlo methods.
Wojciech et al. found that interpolating between measured samples produced realistic results and was easy to understand.
Read more about this topic: Bidirectional Reflectance Distribution Function
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