Object ID pass

Well, some days back someone asked me for small help to automate the process of generating object ID pass. So I thought lets share it with every one....

so here is a small MEL script for generating object Id pass.

To obtain/setup an object ID pass, please follow these steps:

• Copy the given script/code to your maya script editor.
• execute the script.
• and then execute the following command by supplying the render camera name as an argument

  * for example if you are using "persp" as an render camera then the command will be...

  setUpObjectIdPass("persp")

MEL SCRIPT:

//object ID pass

proc setUpObjectIdPass( string $renderCam )

{

         // get selection list

         string $sel[] = `ls -sl`;

         string $camShapeNode[] = `listRelatives -s -noIntermediate $renderCam`;

         int $id = 1;

         // add miLable attribute

         addAttr -ln "miLabel" -at long -k 1;

         for( $item in $sel )

        {

                 // set object ids

                 setAttr ($item + ".miLabel") $id;

                 $id++;

        }

        // create mentalrayOutputPass and connections

        string $mrOutputPassNode = `createNode mentalrayOutputPass`;

        setAttr ($mrOutputPassNode+".dataType") 11;

        connectAttr -f ($mrOutputPassNode+".message") ($camShapeNode[0]+".mentalRayControls.miOutputShaderList[0]");

}

Hit render and you will get a separate render image of object Id pass as an result.

Cheers....