Gonioreflectometer

A gonioreflectometer is a device for measuring the reflection behavior of a material ( mostly for the bidirectional reflectance distribution function / BRDF ).

The device consists of a light source that illuminates the material to be measured, and a sensor which receives the reflected light from the material. The light source should include the area of the material and the light sensor can also record data from a hemispherical area around the target. The hemispherical range of motion of the sensor and the light source corresponding to the (at least) four dimensions of BRDF. The word ' gonio " also refers to this state of affairs and comes from the Greek gonia, meaning' angle ' means in German.

Several similar devices were built for the extraction of data for similar functions. Most of these appliances use instead of the light source intensity sensor measuring a camera to a two-dimensional measurement to obtain:

• Include a spatial gonioreflectometer a spatial BRDF ( McAllister, 2002)
• A camera frame for receiving an optical field ( Levoy and Hanrahan, 1996).
• An unnamed device for receiving value for the BTF ( Dana et al. 1999).

Credentials

• Dana, Kristin et al. In 1999. Reflectance and Texture of Real - World Surfaces. In ACM Transactions on Graphics. Volume 18, Issue 1 ( January, 1999). New York, NY, USA: ACM Press. Pages 1-34.
• Foo Sing Choong. 1997th A Gonioreflectometer for measuring the bidirectional reflectance of material for use in illumination computations. Masters thesis. Cornell University. Ithaca, New York, USA.
• Levoy, Marc & Hanrahan, Pat 1996. Lightfield rendering. In Proceedings of the 23rd annual conference on Computer graphics and interactive techniques.
• McAllister, David. In 2002. A Generalized Surface Appearance Representation for Computer Graphics. PhD dissertation. University of North Carolina at Chapel Hill, Department of Computer Science. Chapel Hill, USA. 118p.

• Optical measuring device