uniform sampler2D texture_emissiveMap;
uniform float uTime;

vec3 getEmission() {
    // Dot the world space normal with the world space directional light vector
    float nDotL = dot(dNormalW, light0_direction);
    // Clamp it between zero and one
    float factor = clamp(nDotL, 0.0, 1.0);
    
    // calculate glow
    float glow = clamp(abs(sin(uTime * 0.1) * cos(uTime * 0.1)), 0.2, 1.0) * 30.0;
    
    // Scale the emissive map by the 'nighttime' factor
    return $texture2DSAMPLE(texture_emissiveMap, $UV).$CH * factor * glow * vec3(1.0,1.0,0.3);

}