I have built a residential area in 3D in Blender that appears on some drone footage. The residential area is partially hidden behind some other buildings. I would like to mask out that part.

 Below the arrow I would like to add a mask in the red square to hide the 3D block of apartments behind the real building

  • $\begingroup$ Hi Hank, and welcome to Blender SE. You can find the answer here, for Blender Cycles: blender.stackexchange.com/questions/7613/…, and here for Blender Internal renderer: blender.stackexchange.com/questions/33301/…. Cheers! $\endgroup$ – Polosson Jan 27 '16 at 17:25
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    $\begingroup$ Could you please clarify this? I'm not sure if you're trying to mask out video footage, or 3D objects. Thanks! $\endgroup$ – TARDIS Maker Jan 27 '16 at 19:40
  • $\begingroup$ Related: blender.stackexchange.com/q/44397/2843 (actually a duplicate, but no answer yet, though tons of links to similar questions) $\endgroup$ – Samoth Jan 27 '16 at 21:06
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    $\begingroup$ added a picture, hopefully it will clarify any questions. $\endgroup$ – Hank Jan 28 '16 at 18:41
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    $\begingroup$ @Hank Thanks, makes it much more clear :) Have you looked at the question that this was marked as a duplicate to? Does that help? $\endgroup$ – TARDIS Maker Jan 28 '16 at 18:47