out vec4 FragColor;

uniform vec4 uColour;

in vec4 aColour;
in vec2 aUv;
in vec3 aNorm;
in vec3 aCo;

void main()
{
   float fintensity = 1.0-(abs(aNorm.y)*0.7);
   float angle = -dot(vec3(0.95,0.0,-0.3),aNorm)*0.5+0.5;
   float fblend = pow(fintensity,6.0) * angle;
   vec3 horizon = vec3(0.9,0.9,0.8);
   vec3 skycolour = vec3(0.4,0.5,0.8);
   vec3 diffuse = mix( skycolour, horizon, fblend );

   FragColor = vec4(diffuse,1.0);
}