Cannot modify a MovieClip filter property

Question

I applied a Bevel filter to a MovieClip. Later in my code, when I'm trying to change a filter property it doesn't seem to work.

Here is my code:

for (var i: int = 0; i < myMovieClip.filters.length; i++) {
    if (myMovieClip.filters[i] is BevelFilter) {
        trace("done");
        myMovieClip.filters[i].highlightColor = 0xFF0000;
        myMovieClip.filters[i].shadowColor = 0x0000FF;
        break;
    }
}

Answer 1

According to this guide from adobe: Graphic Effects Learning Guide for Flash: Filters

Each filter has a set of properties unique to it. The filters can be accessed and modified just like a regular array object, although getting and setting the filters using the filters property returns a duplicate of the filters object instead of a reference.

// This will not work
my_mc.filters[0].blurX = 20;

Because the previous code snippet returns a copy of the filters array, it modifies the duplicate. In order to modify the blurX property, you need to use the following ActionScript code instead:

// This will work
var filterList:Array = my_mc.filters;
filterList[0].blurX = 20;
my_mc.filters = filterList;

So it seems that you need to change your code to something like this:

var filtersList:Array = myMovieClip.filters;
for (var i: int = 0; i < filtersList.length; i++) {
  if (filtersList[i] is BevelFilter) {
    trace("done");
    filtersList[i].highlightColor = 0xFF0000;
    filtersList[i].shadowColor = 0x0000FF;
    myMovieClip.filters = filtersList;
    break;
  }
}