collision layer script not working. Please help.

[NaughtyNathan]

you don't init a $z variable in this example, and you don't reference $x in the loop, but I'm assuming this is either a typo or due to this being a code snippet.

you are telling the setAttr command to set the name: "pirateDebris1.collisionLayer" 1
notice how the space and the 1 is included in the string, so that whole string is being passed to the setAttr command as a single input, hence the error:
// no object matches name "pirateDebris1.collisionLayer" 1

you need to do this:
setAttr ($z+ ".collisionLayer") $y;
so you are only passing the object.attr name as a string and the 1 ($y) as a second parameter.
also, you are redefining $y as an int inside the loop, so Maya will think you are trying to create a NEW variable called $y just inside the for..loop. Don't put the variable type when you simply want to refer to an existing variable, otherwise you'll be recreating a new variable.
string $rb[] = `ls -type rigidBody`;
int $y = 1;
for ($x in $rb)
{
setAttr ($z+ ".collisionLayer") $y;
$y++; // a short-hand way of incrementing a var by 1
}
:nathaN

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