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555 B
GLSL

uniform vec4 lightColor;
uniform vec4 darkColor;
uniform vec2 repeat;
czm_material czm_getMaterial(czm_materialInput materialInput)
{
czm_material material = czm_getDefaultMaterial(materialInput);
// From Stefan Gustavson's Procedural Textures in GLSL in OpenGL Insights
float b = smoothstep(0.3, 0.32, length(fract(repeat * materialInput.st) - 0.5)); // 0.0 or 1.0
vec4 color = mix(lightColor, darkColor, b);
color = czm_gammaCorrect(color);
material.diffuse = color.rgb;
material.alpha = color.a;
return material;
}