viewer.scene.canvas.addEventListener("mousemove", function(){rend();}, false);
viewer.scene.canvas.addEventListener("wheel", function(){rend();}, false);
viewer.scene.canvas.addEventListener("mouseleave", function(){rend();}, false);
viewer.scene.canvas.addEventListener("mouseenter", function(){rend();}, false);
viewer.scene.canvas.addEventListener("pointerdown", function(){rend('on');}, false);
viewer.scene.canvas.addEventListener("pointerup", function(){rend();}, false);
viewer.canvas.addEventListener('click', function(){rend();}, false);
viewer.canvas.addEventListener('pointerdown', f = function(event){
if ((event.button == 2) || (event.which == 3)) {
console.log("오른클릭");
} else {
console.log("오른클릭아님");
}
}, false);