project_selection_to_grid.jsx

/**
 * @author fabiantheblind
 * @description creates from the selected layer in the project panel a grind in te current comp
 *
 *
 * @todo [description]
 */
fun();
function fun(){


app.beginUndoGroup("XXX");

var curComp = app.project.activeItem;
   if (!curComp || !(curComp instanceof CompItem)){
        alert("noComp");
        return;
    }

var step= 110;

    for(var x = step/2; x < curComp.width;x+=step){
        for(var y = step/2; y < curComp.height; y+=step){
            var nl = curComp.layers.add(app.project.selection[0]);
            nl.transform.position.setValue([x,y]);
            }
        }

app.endUndoGroup();
}