I Have footage of my hand moving over a wall and it casts a shadow on the wall. In Blender, I am putting VFX objects on that wall. How can I transfer the shadow from the real wall onto the CG one that my VFX objects are on?

  • $\begingroup$ If the wall is key-able then you need to remove the wall and leave your hand. Then use the hand alpha channel and offset it to simulate a shadow. $\endgroup$
    – 3pointedit
    Dec 5 '17 at 12:40
  • $\begingroup$ is it possible if the wall is not key-able? $\endgroup$
    – Chris Howe
    Dec 6 '17 at 2:14
  • $\begingroup$ Well how are you putting the CG objects on the wall but under your hand? $\endgroup$
    – 3pointedit
    Dec 6 '17 at 7:54
  • $\begingroup$ I masked my hand and the object on the wall has an alpha channel. I cant project the mask of my hand onto the wall because the angle of my arm isn't close to the shape of my shadow. I could ask the shadow and project it but that would produce a mediocre result and it would take a lot of time. Is that what I have to do? $\endgroup$
    – Chris Howe
    Dec 7 '17 at 14:43
  • $\begingroup$ Could you post a setup of hand and wall or other elements? For example how are you superimposing the hand? Are you using the compositor or making the hand a 3D texture mapped object? Does your hand change shape during animation? Could you post a frame of your hand footage? $\endgroup$
    – 3pointedit
    Dec 9 '17 at 12:43

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