[7.3.3.6] \boldsymbol{\rho}(\boldsymbol{\omega}_{\mathrm{i}}; \boldsymbol{\theta}_{\mathrm{r}}, \boldsymbol{\phi}_{\mathrm{r}})
The ratio of reflected flux collected over an element of solid angle surrounding the given direction to the incident flux limited to a conical solid angle.

Note: The direction and the extent of the cone must be specified, and the direction of collection and size of the solid angle “element” must be specified.

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