These are the node setups.
Using Principled BSDF:
Using Diffuse BSDF:
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1$\begingroup$ From my limited testing it seems t be caused bu the Light Path node, whatever it it. Seems like the Principled BSDF shader doesn't really like complex Light Path mixes. Might well be a bug $\endgroup$– Duarte Farrajota Ramos ♦Commented Jan 8, 2018 at 23:05
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$\begingroup$ What I'm trying to achieve is to add a bit of hot pink layer to the cyan ball, without affecting it much. If the cyan ball is glass (say 0,875 transmission) the pink would make the cyan blue. I need cycles to show pink on the side the camera is facing. Not on its backface, not on the other side also. I use a duplicate of the ball, make it half pink with a gradient factor, scaled it up a tiny tiny bit so the colour show. But I don't think this is the correct nor efficient way. Any suggestions of a workaround without using two ehm... balls? $\endgroup$– Blender NoobCommented Jan 9, 2018 at 10:24
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$\begingroup$ Use any shader other than Principled, it seems to work well $\endgroup$– Duarte Farrajota Ramos ♦Commented Jan 9, 2018 at 11:52
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1$\begingroup$ In current release build I have the same result, however using a later build (42a5624 on linux) does not reproduce. I would download a buildbot build and you will probably see the same thing. $\endgroup$– TimarobertsCommented Jan 20, 2018 at 3:31
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