cesiumDemo/Source/Shaders/Appearances/PerInstanceColorAppearanceFS.glsl

varying vec3 v_positionEC;
varying vec3 v_normalEC;
varying vec4 v_color;

void main()
{
    vec3 positionToEyeEC = -v_positionEC;

    vec3 normalEC = normalize(v_normalEC);
#ifdef FACE_FORWARD
    normalEC = faceforward(normalEC, vec3(0.0, 0.0, 1.0), -normalEC);
#endif

    vec4 color = czm_gammaCorrect(v_color);

    czm_materialInput materialInput;
    materialInput.normalEC = normalEC;
    materialInput.positionToEyeEC = positionToEyeEC;
    czm_material material = czm_getDefaultMaterial(materialInput);
    material.diffuse = color.rgb;
    material.alpha = color.a;

    gl_FragColor = czm_phong(normalize(positionToEyeEC), material);
}