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This is a little difficult to explain, but let's say you have an object which you want to act like a ghost and pass through a wall. Easy enough. Now, make the object disappear by passing through a wall, but make the wall transparent as well so that all you see is the object disappear as it moves past a certain point...

Is it possible?

Thanks.

Edit: It could look like this, but imagine the wall is invisible as well. enter image description here

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  • $\begingroup$ hello do you have an image showing what you want? $\endgroup$
    – moonboots
    Jun 23, 2022 at 20:11
  • $\begingroup$ @moonboots added a picture. $\endgroup$
    – sam k
    Jun 23, 2022 at 20:20
  • $\begingroup$ do you mean that at one point the wall becomes half visible on its whole surface? $\endgroup$
    – moonboots
    Jun 23, 2022 at 20:22
  • $\begingroup$ So basically you want to see the ghost approach the wall plane from behind before passing through? $\endgroup$ Jun 23, 2022 at 20:30
  • $\begingroup$ For the best effect you're probably in the realm of compositing two view layers together, one with just the wall and another with a transparent plane that governs the ghost effect while letting you see the ghost on the "non-visible" side of the wall. $\endgroup$ Jun 23, 2022 at 20:32

2 Answers 2

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Try using a boolean modifier on the moving object.

Set it to Difference mode and choose the wall as the boolean object.

Watch to see how it looks:

GIF of a booleaned monkey in Blender.

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You can also use the Holdout option: Create a plane, enable its Holdout option in the Object panel > Visibility:

enter image description here

In the Render panel, activate the Film > Transparent option:

enter image description here

Your wall is now alpha transparent, you can render your object then mix it with your scene, either in the Compositor or in the Video Sequencer:

enter image description here

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  • $\begingroup$ Poor Suzanne!!😢you are not an animal lover!!!😡 $\endgroup$
    – Chris
    Jun 24, 2022 at 9:42
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    $\begingroup$ don't worry she's only travelling through dimensions $\endgroup$
    – moonboots
    Jun 24, 2022 at 9:51
  • $\begingroup$ 🫣 ok, then i just hope she's doing well :D $\endgroup$
    – Chris
    Jun 24, 2022 at 10:00
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    $\begingroup$ I hope so, I have no news since she left, and I don't know how to bring her back from behind the holdout plane :/ please heeeeeeeeeeeeeeeeeeeeelp $\endgroup$
    – moonboots
    Jun 24, 2022 at 10:03
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    $\begingroup$ Oh nooooooooooooo🫣🫣😲😧 $\endgroup$
    – Chris
    Jun 24, 2022 at 10:16

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