#version 430 core

float AMBIENT = 0.1;

uniform vec3 colorStart;  
uniform vec3 colorEnd;    
uniform vec3 lightPos;

in vec3 vecNormal;
in vec3 worldPos;

out vec4 outColor;

void main()
{
    vec3 lightDir = normalize(lightPos - worldPos);
    vec3 normal = normalize(vecNormal);
    float diffuse = max(0, dot(normal, lightDir));


    vec3 gradientColor = mix(colorStart, colorEnd, diffuse);

    outColor = vec4(gradientColor, 1.0);
}