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Let us assume I have a brick wall (rigid body) that I want to get smashed with an object (in a rigid body simulation). I want this object to be invisible in the render. Is that possible? How do I do that?

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    $\begingroup$ Via shaders? Couldn't you just turn up the transparency or use a Transparent BSDF? $\endgroup$ – Shady Puck Jul 30 '16 at 12:20
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As of now, I see no reason why you couldn't add a Transparent BSDF shader to the smashy object.

View:

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Render:

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Animation with transparent smashy thing:

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My .blend file:

Also, as lemon points out, in the Properties panel > Object tab > Cycles Settings dropdown, you could uncheck the Camera checkbox. If you follow this course, though, you will have a disembodied shadow.

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As Nathan Craddock adds, you can also turn off Render Visibility in the Outliner.

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    $\begingroup$ You can also simply disable the camera ray visibility in the Cycles settings of the object $\endgroup$ – lemon Jul 30 '16 at 12:51
  • $\begingroup$ @lemon Very true. Added your advice. $\endgroup$ – Shady Puck Jul 30 '16 at 12:52
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    $\begingroup$ You can also turn off renderability in the outliner. $\endgroup$ – Nathan Craddock Jul 30 '16 at 14:35
  • $\begingroup$ @NathanCraddock Thanks! Added that in, too. $\endgroup$ – Shady Puck Jul 30 '16 at 14:38
  • $\begingroup$ @NathanCraddock If I turn off render visibility I will have my object not rendered, do I ? $\endgroup$ – Old Man Jul 30 '16 at 15:06

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