vec2 scalefactor;
    scalefactor.x = 5.0;
    scalefactor.y = 5.0;

    float v = 0.0;
    vec2 c = v_vTexcoord * scalefactor - scalefactor/2.0;
    v += sin((c.x + time));
    v += sin((c.y + time) / 2.0);
    v += sin((c.x + c.y+time) / 2.0);
    c += scalefactor / 2.0 * vec2(sin(time / 3.0), cos(time / 2.0));
    v += sin(sqrt(c.x * c.x + c.y * c.y + 1.0) + time);
    v = v / 2.0;
    vec3 col = vec3(sin(PI * v), cos(PI * v), 0);
    gl_FragColor = vec4(col *.6 + .2, 1);