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precision mediump float;

uniform float time; // seconds
varying vec2 uv;




float plane(vec3 pos)
{
    return pos.y;
}
float sphere(vec3 pos, float radius)
{
    return length(pos) - radius;
    
}

float map(vec3 pos)
{
    
    return min(plane(pos), sphere(pos, 2.0));
}


void main()
{

    vec3 pos = vec3(0.0,5.0,-10.0);
    vec3 dir = normalize(vec3(uv, 1.0));
    vec3 color = vec3(0.0);
    
    for(int i = 0; i < 64; i++)
    {
        
        float d = map(pos);
        if (d < 0.01)
        {
            
            color = fract(pos * 0.5);
            break;
        }
        pos += d * dir;
    }

    
    
	gl_FragColor = vec4(color, 1.0);
}