黒体軌跡

Planckian locus

Kim et al.

code:glsl

vec2 temp2xy(float temp) {

float t = 1000.0 / temp;

float t2 = t * t;

float t3 = t * t2;

float x = t > 0.25

? -0.2661239 * t3 - 0.2343589 * t2 + 0.8776956 * t + 0.179910

: -3.0258469 * t3 + 2.1070379 * t2 + 0.2226347 * t + 0.240390;

float x2 = x * x;

float x3 = x * x2;

float y = t > 0.45

? -1.1063814 * x3 - 1.34811020 * x2 + 2.18555832 * x - 0.20219683

: t > 0.25

? -0.9549476 * x3 - 1.37418593 * x2 + 2.09137015 * x - 0.16748867

: 3.0817580 * x3 - 5.87338670 * x2 + 3.75112997 * x - 0.37001483;

return vec2(x, y);

}

M. Krystek