2 sided shader with bump not working

[j00ey]

I'm not sure what I'm doing wrong here, I've googled around and not found the answer.

I have a scene with some very thin geometry that needs to be glossy plastic on one side and dimpled foil on the other - I'm using a twosided VOP and the basics work but the bump just doesn't come through. I'm using noise displacement bump.

I can't share the scene but attached is a mockup exhibiting the same behaviour. Also a couple of renders - the side with no butterflies on in the no_bump render should be like the bumped metal in the other still.

I'm missing something obvious I suspect but I can't find it...!

Thanks for reading

2Sided.hiplc

[vicvvsh]

Hi,

if you want two side material with bumped metal  on one side and glossy plastic on the other, i presume it is the best choice to use bump instead of displacement, because displacement has influence to all geometry. Here two pictures: first with displacement, second with bump.

Principled shader does not have ability to use noise for bump by default. You can change a shader and use "noise displacement bump" tab to control bump. See hip.

 

2Sided_01.hipnc

Edited April 15, 2020 by vicvvsh

[j00ey]

That looks like it's doing the trick!

Thanks very much, couldn't figure out what on earth I was doing wrong.