Author Topic: Iridescent Coating / Multicolor Paint  (Read 2489 times)

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Offline CLM

Iridescent Coating / Multicolor Paint
« on: May 07, 2019, 02:34:08 pm »
Hi there,

First port here, hopefully you can help me. I'm Industrial Designer so Keyshot is a secondary skill to me, therefore I'm still very much learning and appreciate your patience.

I am looking for a dark tone material with an iridescent coating but also a highly reflective look. The tricky part is that I need to be able to control the color spectrum of the iridescent effect.

First thing I tried, favoring color spectrum control over dynamic effect, was a metal material with a gradient color texture. It does an ok job a some specific views, but obviously doesn't display any dynamic effect and doesn't work too well with complex geometry.

Then, after looking for some help on this forum, I ran into multiple "pearl material" solutions that I thought would help, especially this one from Bdesign:
Unfortunately, the control of the color spectrum is not that good and I have been having a hard time creating high contrast reflection.

Finally, I found that post from Didi, but it's very old and I doubt I will get any answer from the creator:
But the material achieved on the last version, UKUK, seems very promising to me.

I am a bit stuck in my research now, so hopefully one or some of you would have advice for me.


Offline DMerz III

Re: Iridescent Coating / Multicolor Paint
« Reply #1 on: May 08, 2019, 11:47:20 am »
I would play around with the Metallic Paint shader, and change the color of the clear coat + mess with the settings for Clear coat IOR and thickness, this usually gets you some cool effects similar to what you just attached.

Offline DMerz III

Re: Iridescent Coating / Multicolor Paint
« Reply #2 on: May 08, 2019, 12:06:30 pm »
Here's a quick demo I did. You can see when you play with it yourself, there's lots of variation possible. CC Thickness really has a strong effect, so play with that a lot as well until you start to understand the differences it makes.

Offline CLM

Re: Iridescent Coating / Multicolor Paint
« Reply #3 on: May 09, 2019, 03:25:30 pm »
Thanks DMerz, I gave another try to the metallic paint, but even though it technically gives more control, I found it harder to get the color transition I want.

However, I think I figured it out using the Thin Film + Metal Backside material, "Pearl" method (see pic 1).
My issue is that I wasn't able to get a bright reflection at first, but then by increasing the index all the way up to 2.5 and dialing my thickness back to a proper color spectrum it started to work.
Adding a color layer on top of it, here a gradient, also helped me forcing an effect on a dedicated spot.

I am still having issue with that spot gradient on the edge, it's not smooth enough of a transition I feel (see pic 2).
Any tips?

Next steps are trying different tones and improving the environment.

Offline DMerz III

Re: Iridescent Coating / Multicolor Paint
« Reply #4 on: May 10, 2019, 07:53:48 am »
Nice! looking really promising and thanks for sharing your results after working through it.

As for the gradient, I don't have any advice there, unfortunately. In the past I have made gradients in photoshop that were 16-bit or 32-bit for specific cases (such as light falloff maps) but not sure if that helps you in this case.

Offline monson67

Re: Iridescent Coating / Multicolor Paint
« Reply #5 on: July 30, 2019, 09:44:01 am »
I've been trying to achieve an iridescent metallic paint look as well. Would you mind sharing the material so that I might experiment with what you have? Of course, I'd also share any meaningful adjustments I make.
« Last Edit: July 30, 2019, 11:04:49 am by monson67 »