Thin film OSL shader

[^Lele^]

for all the samples: black diffuse, map in the reflection slot, GTR BRDF, 0.55 RGlossiness.
The dome is black and white, so all the colours are from the map.
Map parameters (fixed across the samples):
min thickness: 200
max thickness: 666
rest as default.
Changing, by 0.05 increments is the IoR, from 1.15 to 1.65 in the last example (next post)

[^Lele^]

[^Lele^]

[bigbossfr]

I have this error in Maya : OSL shader error: Could not compile shader C:/Users/damien.SDC/Downloads/thinfilm/irridescence.osl (OSL to OSO)
?

[Vizioen]

Holy sh...everytime I think I've seen everything something new comes up. So the only way to achieve this effect is to use this OSL shader? It would be indeed a great addition to the VrayMTL, and ignore clutter, the more buttons the better .

[jonnybefree]

nice tests lele. wonder the differents in rendertimes from start to end?

[^Lele^]

seconds.
The effect of the shader itself on rendertime is negligible, and so quick i'd call it invariant from test to test.

[Joelaff]

We used this thin film map just yesterday to add extra realism to a CU of an old plaster type picture frame. The frame is the really ornate type, painted gold. Took a pretty complex shader flow graph to get it to look the way I wanted it. The thin film was used in screen mode on top of the reflection channel of the base layer (in a composite map). Then we VRayBlended some VRayFlakes on top, which turned out great. Client was blown away by the subtle color variations.

So, thanks, Vlado!

[vlado]

Nice! I'm glad this came in useful

Best regards,
Vlado

[Art48]

Ah, good idea on the screen mode composite map. It's still magic to me how this works :P

[Joelaff]

Ah, good idea on the screen mode composite map. It's still magic to me how this works :P

I dunno if that is the ideal way to use it, but it worked nicely for my purpose, and renders faster than a whole second material with a blend. My surface is already slow enough with VRayFlakes as a second material blended

[R2J2]

I desaturated and played with the hue a bit so I'm not sure how accurate this is but it's an awesome shader.

[zeronove]

I would like to test this OSL shader but it crashes max 2011 every time I try to load it! ...any idea? ...is it supposed to work with older releases?
PS the same happens with the other OSL (AFMFresnel)

[Joelaff]

Looking nice!

In the past we would achieve somewhat similar results with Tri planar falloff maps of different colors. More artist control, I guess, but more of a pain, and not accurate (though I don't know how accurate this is after you tweak it).

LightWave has had a thin film shader for twenty years, and it was fun to play with. This one is much easier to use in production.

[Morbid Angel]

nvm got it to work, but only as osl texture in reflection map mode.