GGX - best way to recreate it for all metals, problems translating to Corona

[ktulu]

Corona 3 way blend material:

a.reflection level 0.95
glossiness 0.8
Fall-off RGB calculated above

b.reflection level 0.95
glossiness 0.9
Fall-off RGB calculated above

c.reflection level 0.95
glossiness 0.99
Fall-off RGB calculated above


Blending 3 different glossiness materials achieves absolutely nothing.2 and 4 look exactly the same. Except a longer rendering time.So I need help here.

I think what is happening here is that in each case you are overriding the Reflection glossiness value with the same map, hence you are blending 3 materials that are looking exactly the same.

[GestaltDesign]

Hi all,

Hope you do not mind me throwing in some of my own experimentation as I also think this is a great topic!
Another signee here to Grant Warwick's course I was also curious how I could implement this very logical approach into Corona.
I have reasonable CPU power so was not concerned with the mutli sampling.
As I think as Juraj had mentioned I multi layered the Blend Map and was very satisfied with the results.
Quickly this morning I put together a comparison model comparing single vs multi layer in vray and corona. Only observation was that I found that the Vray and Corona Glossiness values were not like for like so reduced the Corona value to approx half. I considered that Ward contributed to this on the Vray side. You can see in my comparison the single layer material starting point.
So in my ignorance am I missing anything in this approach as it appears to be working fine, cheers!

[GestaltDesign]

Hi Geelash,

Sorry if I misunderstood your post but as far as IOR is concerned on the 999 setting, this is correct as it is the Corona setting for OFF,
then your  falloff map in the reflection colour is controlling the IOR.
Therefore you are correctly representing gold when dialing in the physically correct falloff map.

[gleelash]

GestaltDesign, your result seems like a good starting point.
Way better than my tests so far.

Keymaster, I'm rendering 3 human skulls off of a Z Brush model, with some modeled cracks, one frontal and some spinney ones aside (so it's not a symmetrical scene). Hope it is complex enough I scoured the internet to quickly model something but...not much in this world made out of platinum, gold or copper. I will render these "blindly" by sending them to a friend, the copper might feel a bit de-saturated, we'll see. I will update ASAP when there done tonight.

[Ondra]

ok, this is nice example. I am not sure you would reproduce the same material, but the gold statues definitely show enough improvement for me to start investigating the possibilities.

[GestaltDesign]

It's cool once you start getting creative with it, such as darkening the falloff and adding into AO and adding dirt layers, I had a quick go now and attached setup :)

[agentdark45]

Wow that tarnished gold material is really good! Would you mind uploading the material here for us to test?

[Juraj]

You deserve many beers Gestalt !

[Chakib]

I'm waiting for that baby, really nice effort & examples !

[nehale]

GGX Yes.... was just coincidentally also watching grant's advanced shader tutorial today and was about to start experimenting to see how i can recreate it in corona then i find you Gestalt.

WELL DONE

[daniel.reutersward]

I´ve tried to reproduce Grants materials with Corona, and I think it works really well but GGX would be great to have!!

[nehale]

I´ve tried to reproduce Grants materials with Corona, and I think it works really well but GGX would be great to have!!

do you mind sharing some renders of them Daniel

[daniel.reutersward]

Sure, I will do that as soon as I get home!

[GestaltDesign]

Keymaster - Very exciting news, sure something amazing will come of it!
Juraj - Beer is always good, glad to be of service :)

I have just uploaded the base gold material to play with on CML, thought that was the easiest option.
I will upload the Tarnished Gold when I find time to make a custom map as yesterday I just banged in the first dirt map available and it may not be freely distributable, just want to be sure.

Have to flag up Grant's course, it really is that bloody good, totally recommend signing up and completely transferable to Corona. 
Bit like Corona in it's intelligent, no nonsense, "if you're gonna do it, do it properly" style!

[GestaltDesign]

Tarnished Gold uploaded to CML.