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Hi!
This is my try on using thinfilm coatings to emulate the iridescence on some sort of a shell.

SL 13.08
Time 5h 53m

(original size: 1280x768)

I like it. Tough I'd like to know how it behaves in an animation.
But that is a little too much time consuming, I think

Looking real good so far, could you share your material??

While trying to get more color out of the thin coatings I fugured, that M~R currently supports 4 Basic layers only.... why ever that is.

So I creted 4 layers with low reflecting BRDF having high trasmittance.
each has bumbmap of this thin streched noise with different position of the projector. Plus one coating per layer of value Nd:1,5 / 1,6 / 1,7 / 1,8
I used the bumpmap for coating-thickness also. And each layer has a doughnut-like weightmap with different radius forech layer.



@NicoR44: sure... just give me some time to putt everything together

Great work Sam that's a beautiful result!
Did you model that shell ?
Why not post the shader for us all in the Goodies section

/ Max

wow, great

OK I'm giving you the complete scenes, since the MXM makes sense only with the correct projectors and bitmaps.

First scene (3MB)
Second scene (2.8 MB)

Amazing!!!! Sam!!!! you got to share screen shots of the material editor... please

thank's for sharing Sam

Thanks a LOT!

Sweet! thanks so much for sharing the scenefiles with us, i appreciate it Sam.

I'm curious tho, you mentioned you used a bumpmap on the shell. Right, now in the first image it looks more like a displacement and not a bumpmap. Am i wrong again ?

/ Max

Thank you guys!

@Maximus3D
Yes you are half right. I slightly used displacement in the object. But I combined it with bump. I think M~R Bump is really strong!

So in both scenes I used the exact same displaced object for the shell.

@Nicolas Rivera
MXM:

Just had the idea, that it might be easyer to have a texturing funcontion for ND value.
I'm not quite shure whether that makes sense in a physical way... but maybe it would create the desired effect.

just sharing my thinkings

Sam7, ....good material. You had asked---how would it perform like in an animation? easy test ........here's my take : render from different angle / compare / if there is a color shift(matching areas) / then the animation (let's say turnrable) will show the 'moving colors'. I've been wondering about this since June, ...I actually use 'interference' colors at work from time to time and wondered (and thought definitely not) could a renderer do such a thing ....well, ....low and behold the new material system. Amazing really. ........now for the animation part. ...another story.

btw: ..it looks like you've inadvertently done the test, there is color shift between the 2 renders, ....although, I didn't read everything and don't know if the settings had been altered.

That's a great test, Sam7, especially the iridescent reflection in the black marble!

Regarding the iridescence in coatings, what I've found (examples here and here) is that the color at any given point on the object is dependent on the angle formed between the camera, the location of the point's position on the object surface, and the light source. So, in an animation, the irridescence will shift if either the light-source location, camera position, or object orientation changes frame-to-frame.

Now, to go truly psychedelic, in addition to scene movement, one could try altering the Nd, thickness, or attenuation of the coating, frame-to-frame...

::brain explodes here::

...fun stuff!


~JD

Absolutely... the best way to experiement is to animate.