void main () {
    float y = calculateSurface(position.x, position.y);

    vec3 p1 = vec3(vert1.x, calculateSurface(vert1.x, vert1.y), vert1.y);
    vec3 p2 = vec3(vert2.x, calculateSurface(vert2.x, vert2.y), vert2.y);
    vec3 p3 = vec3(vert3.x, calculateSurface(vert3.x, vert3.y), vert3.y);
    vec3 normal = normalize(cross(p2 - p3, p1 - p2));

    gl_Position = perspective * camera * vec4(vec3(position.x, y, position.y), 1.0);
    vcolor = normal;
}