I'm trying to replicate the "polarisation" effect - so if you look through a piece of glass that's polarised you can see an image behind that image that normally would be invisible or white as it's been polarised too. So, I want to have a see-through material I can apply to something, so that the thing behind it is only visible if seen through that material. Is that possible? If so, how?
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$\begingroup$ Will the material possibly be "seen" through other transparent objects you don't want to reveal it? If not, you can test if the Transparent Depth value > 0. $\endgroup$– PGmathCommented Sep 20, 2016 at 17:01
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$\begingroup$ No, it will be seen through all transparent objects! Can you explain a bit more about testing the Transparent Depth value > 0 ? Where do I do that and how? $\endgroup$– riccardolardiCommented Sep 20, 2016 at 20:39
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$\begingroup$ You need render layers. $\endgroup$– Bradman175Commented Sep 21, 2016 at 0:42
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$\begingroup$ @alberto2000 what ShadyPuck answered basically. $\endgroup$– PGmathCommented Sep 21, 2016 at 3:34
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1 Answer
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Window:
Material seen through window:
Viewport render showing Suzanne through window:
Viewport render showing invisible Suzanne next to window:
What I have is a Glass BSDF window, slightly off white in color so to be seen, and with a 1.00 IOR to be in all rights except one a Transparent BSDF. Glass BSDFs refract rays like glass refracts light, and I can test for that refraction (called a Transmission Ray).
My Suzanne has a material (red Diffuse BSDF, but can be anything) that is mixed with a pure white (clear) Transparent BSDF. The mix Fac:, whaddoyouno, just happens to be a Transmission Ray :)
.blend file:
answered Sep 21, 2016 at 2:41