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I want an object to not be visible at all in a render. I am trying to contain some particles in a simulation and I need them to not get out of the enclosure so I want a transparent object there (when I render) to prevent them from escaping.

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The following material setup should give you a completely Transparent material that cannot be affected by light etc.

enter image description here

You can add a material and set the specularity and alpha to 0 and disable shadows but the easiest way is to not render the object at all. Open the Outliner and untick the camera beside the object.

enter image description here

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  • $\begingroup$ I don't use Cycles much but I believe you can use a Transparent BSDF to get a transparent material. $\endgroup$
    – iKlsR
    Dec 7 '13 at 13:44

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