If you need to create Label IDs for compositing you can use the following procedure. This is just an alternative solutions apart from the others available.
Create a mental ray camera output pass called label 1×32 which is a framebuffer required for the labels. Next you select your objects and run the script below.
What the script will do is assign a random number to your selected objects. For any color of the ID you can have a range between 0-100, otherwise if you want specific color, each color is tagged with a number, for example 1 = green, 2 = red etc.. Note: this does not work with exr in 2008, only png or similar formats. It does not work with any kind of motion blur, i.e. rapid motion or scanline motion blur will fail to output label.
[cpp]
global proc random_Attr()
{
string $objName[]=`ls -sl`;
string $temp;
string $tempAttr;
float $randValue;
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{
$randValue=rand(0 , 100);
addAttr -ln miLabel -at long $temp;
$tempAttr=$temp+".miLabel";
setAttr $tempAttr $randValue;
print "your miLable has been added";</pre>
}
}[/cpp]
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