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I am currently interested in tracking 3d objects into my videos. I am not sure how to create what looks like a hole in the ground. If I used a sqaure with no top face, the outer sides of the cube would still appear over the video, I need only the inside of the cube to be seen.

Is it possible to make a sort of plane object that hides the 3d objects behind it, but still shows my video background?

-Owen

Owen McGough
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    some picture will give a clue what you're trying to achieve. for now it's unclear. note that everything is possible, though ) – Mechanic May 18 '20 at 01:31

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As Mechanic says, what you ask is not clear, please show some screenshots. Do you want to create an alpha transparency wherever you want on your 3D object? The Holdout shader does that. Don't forget to activate the Properties panel > Render > Film > Transparent option.

enter image description here

moonboots
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  • I think OP wants to create a 3D object that looks like a hole in the ground and add it over some footage of a ground (so only the top + inside of the 3D object would be visible). The question is worded in a confusing way. – Luciano May 18 '20 at 10:23
  • ok understood, I think Holdout is still the right solution, no? – moonboots May 18 '20 at 14:27
  • Sorry for my bad explanation. As Luciano says, I am trying to make an overlay that could appear as a hole in the ground. I tried the holdout shader and it seems to work for what I am trying to do. Thank you very much. – Owen McGough May 18 '20 at 22:50