IESData Class Reference

To read and evaluate IES angular profiles (https://www.ies.org). More...

Public Types
enum	HorizontalSymmetry
enum	InterpolationType

Public Member Functions
void	clear ()
void	read (const CoreString &filename, InterpolationType interpolation_type)
float	evaluate (IESCoordinates const &coordinates) const
bool	initialized () const
const float	get_max_colatitude () const
bool	is_axially_symmetric () const

Detailed Description

To read and evaluate IES angular profiles (https://www.ies.org).

A few "artistic" choices have been made regarding symmetry, interpolation and extrapolation of IES data.

Horizontally, the symmetry is axial if there is only one horizontal angle, bilateral if the last angle is 180 degrees, quadrilateral if it is 90 degrees, no symmetry otherwise. Horizontal interpolation is linear.

Vertically, no symmetry is assumed; if the last angle is < 90 (resp. 180) degrees, then a value of 0 at 90 (resp. 180) degrees is added, with a horizontal slope. Interpolation is done using Fritsch & Carlson's piecewise monotone cubic Hermite (https://en.wikipedia.org/wiki/Monotone_cubic_interpolation).