Johnathon Selstad
1e3ddd612e
* Begin Sorting SubProjects into Folders * Add more subprojects to folders * Add even more subprojects to folders * Add further subprojects to folders * Move the last two projects * Move Resources to a Resources subfolder * Remove spaces to be stylistically coherent * Revert Improper CMake Modifications * Revert erroneous line removals * Only specify sdl2's folder on WIN32 * Add the shader subprojects to a Generated folder * Move shaders to Filament/Shaders
specular-color
specular-color computes the base color of conductors based on spectral data.
The base color is output in linear and sRGB formats. The base color is the reflectance
at normal incidence (0°) and is often noted f0.
specular-color can also compute the perceived color of a conductor at another angle,
set to ~82° by default. This value is particularly useful when used in combination with
the Lazanyi-Schlick model to better approximate the behavior of metallic surfaces at
grazing angles. See Hoffman 2019, "Fresnel Equations Considered Harmful".
Usage
$ specular-color <spectral data file>
The spectral data files can be obtained from Refractive Index.
For instance, to compute the base color of gold:
$ specular-color data/gold.txt
To set the second angle, use -a to specify the angle in degrees:
$ specular-color -a 75 data/gold.txt