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GLSL

uniform sampler2D image;
uniform float minimumHeight;
uniform float maximumHeight;
czm_material czm_getMaterial(czm_materialInput materialInput)
{
czm_material material = czm_getDefaultMaterial(materialInput);
float scaledHeight = clamp((materialInput.height - minimumHeight) / (maximumHeight - minimumHeight), 0.0, 1.0);
vec4 rampColor = texture2D(image, vec2(scaledHeight, 0.5));
rampColor = czm_gammaCorrect(rampColor);
material.diffuse = rampColor.rgb;
material.alpha = rampColor.a;
return material;
}