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I am doing the Introduction to Camera Tracking in Blender tutorial by Blender Guru.

enter image description here

Somehow, I managed to mess something up, and supposedly hidden parts of the hole are showing. I don't understand where I went wrong. Thoughts?

Here is the .blend file:

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    $\begingroup$ Looks like the mask (the ground plane) is not big enough and therefore can't mask out the wall of the pit going down into the ground. $\endgroup$
    – Gliderman
    Commented Aug 9, 2016 at 15:04

2 Answers 2

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Your jagged ground plane isn't big enough. Use the following procedure to fix it.

  1. Tab into Edit Mode.
  2. Your outer ring should already be selected (it is in the .blend). If it is not, use Alt + RMB RMB to select the edge loop:

enter image description here

  1. Key S to scale the edge loop up until you can't see the tube any more.

enter image description here

  1. Tab out of Edit Mode.
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  • $\begingroup$ btw ...your answer did do the trick, but I must say that I am not understanding what I am doing. Is this "jagged ground plane" a sort of mask ? $\endgroup$
    – user13877
    Commented Aug 9, 2016 at 15:22
  • $\begingroup$ @OldMan Yes. The compositing makes it so. If my answer helped, please consider marking it as accepted. $\endgroup$
    – Shady Puck
    Commented Aug 9, 2016 at 16:26
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You can also mix the material of the sides of the hole with a holdout shader while using the backfacing output of a geometry node as the fac input of the mix shader.

Without the holdout shader:

enter image description here

With the holdout shader:

enter image description here

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  • $\begingroup$ The OP didn't help by tagging the post as Cycles, but the .blend is in BI. $\endgroup$
    – Shady Puck
    Commented Aug 9, 2016 at 23:54
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    $\begingroup$ If you download the .blend it is in cycles. $\endgroup$
    – Ezra
    Commented Aug 10, 2016 at 8:36

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