Turbo Colormap

https://gyazo.com/ab2b58675accab874c9ed044406deba5

Turbo, An Improved Rainbow Colormap for Visualization

明るさの変化がなめらかで、Color blindの人からも認識しやすいColor Gradient

GLSL

GoogleがGLSLで多項式補間を配布してくれている

code:glsl

// SPDX-License-Identifier: Apache-2.0

// Polynomial approximation in GLSL for the Turbo colormap

// Authors:

// Colormap Design: Anton Mikhailov (mikhailov@google.com)

// GLSL Approximation: Ruofei Du (ruofei@google.com)

vec3 TurboColormap(in float x) {

const vec4 kRedVec4 = vec4(0.13572138, 4.61539260, -42.66032258, 132.13108234);

const vec4 kGreenVec4 = vec4(0.09140261, 2.19418839, 4.84296658, -14.18503333);

const vec4 kBlueVec4 = vec4(0.10667330, 12.64194608, -60.58204836, 110.36276771);

const vec2 kRedVec2 = vec2(-152.94239396, 59.28637943);

const vec2 kGreenVec2 = vec2(4.27729857, 2.82956604);

const vec2 kBlueVec2 = vec2(-89.90310912, 27.34824973);

x = saturate(x);

vec4 v4 = vec4( 1.0, x, x * x, x * x * x);

vec2 v2 = v4.zw * v4.z;

return vec3(

dot(v4, kRedVec4) + dot(v2, kRedVec2),

dot(v4, kGreenVec4) + dot(v2, kGreenVec2),

dot(v4, kBlueVec4) + dot(v2, kBlueVec2)

);

}