Author Topic: cloudy plastic with shiny surface  (Read 863 times)

0 Members and 1 Guest are viewing this topic.

Offline andy.engelkemier

cloudy plastic with shiny surface
« on: April 20, 2020, 07:06:01 pm »
You can get a pretty wicked good looking plastic with dielectric, but not if you want it with a Milky look. That requires at least some fake SSS so that you send light in , and you can control sending light back toward the camera.

The Cloudy plastic is Great for that. Only, it's missing a Huge setting. Ever seen a really milky plastic that has the exact same roughness on the inside as the surface? No. Hardly Any materials are like that. That's what  is so great about the dielectric material.

I ended up settling on using the translucent material. This part is probably a 4mm ring about 25mm wide. That's it. And I had to use a translucency distance of 1000mm to get close to what i wanted. It's not correct, but if it looks good, it is good. After it finally cleared up enough, and denoise is Necessary, it ended up too dark but that's an easy photoshop fix. At least it's one render submition.

I was trying to figure out a way to put a clear coat on the cloudy plastic. Because that has the controls I want. All, except for some surface reflections. And yeah, I can render twice. But I have a lot of views and color versions to do. So that is Really not ideal. Do you know how long it takes to send 18 different studios to a network farm from home to work? Because I do. Cutting that in half is definitely worth it.

I thought I had something working with transparent plastic as a label. I'm not sure why it lets you do that, but doesn't let you use some of the other transparent materials, but it seemed pretty messed up. I Really wish Keyshot just had Real material mixing. Labels are super nice, because it's quick. But sometimes you just need an advanced material.

So milky plastic, but with a nice gloss finish. Ideally, using the Cloudy Plastic. And there are details Right behind this thing. Internal glossy needs to be somewhere between .2 and .3 at minimum. There's no light on the other side, so all the light is from the front. There are LED's back there, but they won't be turned on....for now.  (Ha, I'm not wasting my time with that. I do that in Photoshop 99.99% of the time)

Offline INNEO_MWo

  • Hero Member
  • *****
  • Posts: 1155
  • Total likes: 44
  • Senior Technical Consultant @ INNEO (Germany)
    • german KeyShot page from INNEO Solutions
Re: cloudy plastic with shiny surface
« Reply #1 on: April 21, 2020, 01:36:04 pm »
Any reference image?

Offline andy.engelkemier

Re: cloudy plastic with shiny surface
« Reply #2 on: April 22, 2020, 07:01:22 am »
I don't think the sample sent to me is public and I couldn't find anything. The closest thing I could find are the covers for LED t5 light bulbs, or a glossy surface under cabinet push light. Fairly thin, has a decent amount of transparency, but does a great job of obscuring what is behind it.

I didn't realize that the cloudy material roughness effects the surface gloss, so just leave that at, or near, zero. So there's my facepalm moment.

I finally landed on something I'm pretty happy with.

Transmission: 97% white
Transparency distance: 30mm
Cloudiness: .92
refractive: 1.6 (cheating here a bit obviously)
Roughness: 0
Cloudiness color: 71% white
Scattering Direction: -.21
Samples....doesn't matter. I wouldn't dare use this material without denoise. But it's left at 16.

If I'm reminded in a few months then I can probably post the final image once it lands on actual packaging. It's nuts how much better the images look on the packaging background though. Products look Terrible on flat white backgrounds, or flat Any color almost.

The unfortunate thing about that material is it appears they have linked internal gloss and overall transparency with the "cloudiness" setting. So if you get the amount of obscuring right, but decide it needs to be more or less opaque it's a battle.