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I'm following this tutorial where you create a popular illusion using images as planes.

Tutorial: https://www.youtube.com/watch?v=sk87jDzHGKA

However, I can't seem to get the object to receive shadow unlike other objects I've worked with before. It could be that the nodes I've used to get this result is a mix shader that uses the images of the back and front of the illusion with backfacing but I don't know how to get around this.

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enter image description here

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  • $\begingroup$ please share your file (also pack external images to have all the assets). It's not clear if you have any light or not. without lights there are no shadows. $\endgroup$
    – Sanbaldo
    Jul 25, 2020 at 6:44
  • $\begingroup$ There is a light. It's just that the images to planes has no shadows. Do you know how to attach a .blend file to this post? $\endgroup$
    – James Huang
    Jul 26, 2020 at 5:31
  • $\begingroup$ Well, "images to plane" have so many problems, why don't start from a standard plane? The process is the same (I know the tutorial use "images to plane" but there is no reason to follow this part). Otherwise you can try to use a solidify modifier to have a 3d mesh from a plane and so cast shadows. $\endgroup$
    – Sanbaldo
    Jul 26, 2020 at 5:34
  • $\begingroup$ Alright I'll try that. $\endgroup$
    – James Huang
    Jul 26, 2020 at 7:09

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After some looking around, I found the solution. Since I was using only image textures and a mix shader no shadows would be created. I had to put the images through a principled bsdf node before giving it to the mix shader so shadows could be created.

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