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bidir
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There are 5 letters in BIDIR ( B3D2I1R1 )
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Definitions of bidir in various dictionaries:
BIDIR - The bidirectional reflectance distribution function (BRDF; f r ...
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Bidir might refer to |
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The bidirectional reflectance distribution function (BRDF; * * * * * f * * r * * * ( * * ω * * i * * * , * * * ω * * r * * * ) * * * {\displaystyle f_{\text{r}}(\omega _{\text{i}},\,\omega _{\text{r}})} * ) is a function of four real variables that defines how light is reflected at an opaque surface. It is employed in the optics of real-world light, in computer graphics algorithms, and in computer vision algorithms. The function takes an incoming light direction, * * * * * ω * * i * * * * * {\displaystyle \omega _{\text{i}}} * , and outgoing direction, * * * * * ω * * r * * * * * {\displaystyle \omega _{\text{r}}} * (taken in a coordinate system where the surface normal * * * * * n * * * * {\displaystyle \mathbf {n} } * lies along the z-axis), and returns the ratio of reflected radiance exiting along * * * * * ω * * r * * * * * {\displaystyle \omega _{\text{r}}} * to the irradiance incident on the surface from direction * * * * * ω * * i * * * * * {\displaystyle \omega _{\text{i}}} * . Each direction * * * * ω * * * {\displaystyle \omega } * is itself parameterized by azimuth angle * * * * ϕ * * * {\displaystyle \phi } * and zenith angle * * * * θ * * * {\displaystyle \theta } * , therefore the BRDF as a whole is a function of 4 variables. The BRDF has units sr−1, with steradians (sr) being a unit of solid angle. |