tri

function onGLC(glc) {
    glc.loop();
    // glc.playOnce();
    glc.size(540, 540);
    glc.setDuration(2.5);
    glc.setFPS(30);
    // glc.setMode("single");
    // glc.setEasing(false);

    var list = glc.renderList,
        width = glc.w,
        height = glc.h,
            color = glc.color,
            ox = width/2,
            oy = height/2,
            TWO_PI = Math.PI*2;

    // your code goes here:

    var num = 50,
        v = 25,
        even = true;

    for (var i=0; i<num; i++) {
        list.addPoly({
            x: [ox-v, ox+v],
            y: oy,
            sides: 3,
            rotation: [30,90],
            fillStyle: even ? "darkred" : "white",
            radius: 180 - i*3.68,
            shadowColor: "rgba(0, 0, 0, 0.35)",
            shadowOffsetX: 5,
            shadowOffsetY: 5,
            shadowBlur: 20,
            phase: i/(num*1)
        });
        if (i%3===0) even =! even;
    }
}