Holographic Foil (e.g. holographic sticker) C4D r20

[Bih_B]

Hey hey, I am exploring holographic foil as a 100% procedural Corona shader and wondered if anyone here has been through the process already and could help me with the best way of setting this up? 

Super many thanks in advance! ...and I hope this thread will be useful in the future for anyone else here working on packaging etc.

[maru]

Could you post some real life reference? I am sure there is a loooot of different holographic foil types.

[Beanzvision]

I would assume something like this perhaps.


Could be a good job for the thin film shader. ;)

[Bih_B]

Hiyarr, so I thought I'd take it a step further and go for a holographic effect like here:

I understand that I needed to use some fresnel and alpha magic - I'll do some tests in a bit and will post results if anything will go according to plan haha

In the meantime, if you have pointers to how to go about it, I'll be checking in in-between my session inside C4D.

[burnin]

Mix Thin Film with desired Texture for Iridescent effect (Iridescent color is controlled by gray scale image - darker = thicker).
Make two and Layer them together using Fresnel for masking (to get this "contra" effect, one is positive & other negative).
e.g.

[maru]

Mix Thin Film with desired Texture for Iridescent effect (Iridescent color is controlled by gray scale image - darker = thicker).
Make two and Layer them together using Fresnel for masking (to get this "contra" effect, one is positive & other negative).
e.g.

Where is the like button!? :D

[Bih_B]

Thank you again everyone for the intel (!) @burnin especially :)) This worked a charm + allowed me to expand on this by combining this into several geometries and materials. All still work in progress on my end. I'm looking into a credit card type of holo combo...

Just to add to the thread; following @burnin I added two images and a fresnel under each of those (one of which inverted) into the diffuse color which I've set up as a layer.

--- Diffuse ---

COLOR
- Layer:
1 - Image 1 / normal
2 - Fresnel / layer mask
3 - Image 2 / normal
4 - Fresnel (inverse) / layer mask

(I found it counter-intuitive at first that the masks need to go 'below' each image)

--- Reflection ---

COLOR
- Thin film (with colors based on thickness e.g. 500nm)
- IOR of 1.5

(Optional to this, you can use a color gradient of your choice as a fresnel vs thin film - looks also very cool)

COLOR MIX
- Normal / 92%

FRESNEL IOR
- 666

GLOSSINESS
- Fresnel (inverse)

[burnin]

@maru
All good, me no "like me" button... or only, if "dislike" comes along... otherwise it's racist :P


@ Bih_B
Oh, c'mon now, visual artist ;) "Images speak louder than words."

And a couple of notes from my experience:
- "Invert Fresnel" (checkbox with Physical Fresnel) doesn't make it a Negative.
- Fresnel IOR is basically a type of a Gradient when looking at graph curvature from Top view ;)

[Bih_B]

@burnin hahaha ya I kno ... my requirements evolved from the request here in but I'll add to this once I'm done (this is just a thing on the side for me rn)
and yep reg fren IOR - woz just listing parameters for those who may be as n00bzor as myself ;) your pointers were more than on point so thanks sooooooo much once again :)
N.B. inverse fren = I literaly changed the gradient from BK to W (there is no inverse check box actually) unless I misunderstood? anyway, all worked as u suggested so...