Author Topic: NATURA NON FACIT SALTUS  (Read 3594 times)

2021-01-31, 19:11:53

LorenzoS

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Hi all,
Using the standard material, in situation where the dielectric material is close to metal behavior, increasing the ior value I can enter into the metal behavior with continuity.
bUT Using the new physical material i cann’t find that continuity because when i switch from non-metal to metal material it change completly aspect.
There is a simple way to obtain that continuity with physical material?

Thank you

2021-01-31, 19:17:38
Reply #1

LorenzoS

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...sorry,
the rigth attachments are theese ones.

2021-01-31, 19:58:21
Reply #2

romullus

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Maybe try to use Corona layered material? Put metal material into one slot, dielectric into another and change the blend strength to get gradual transition from one to another.
I'm not Corona Team member. Everything i say, is my personal opinion only.
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2021-02-01, 09:43:49
Reply #3

LorenzoS

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Yes romullus thanks,
can be a solution, but it's more simpleto  use the legacymaterial for this specific case.
When the legacymaterial will be deprecated i hope will be a corona material converter.

2021-02-01, 14:07:51
Reply #4

burnin

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I don't believe there's anything to worry about Corona.



It's Physical.
And, more of a PEBCAK issue.
;)

2021-02-01, 16:45:51
Reply #5

maru

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@LorenzoS - can you explain in what exact situation you need a "dielectric material close to metal"? The whole point of the new physical material is to distinguish between dielectrics and metals, which have very different properties. For example, IOR is capped at 3 for dielectrics, because in reality there is no dielectric with such high IOR.

Understanding what and why users are doing greatly helps our developers decide if a feature is needed or not and if something should be changed or not.

Please note that you can also map the metalness, which allows you to decide which areas are metallic and which are not (e.g. in case of textures generated with other software; white = metal).
Marcin Miodek | chaos-corona.com
3D Support Team Lead - Corona | contact us

2021-02-01, 21:31:47
Reply #6

LorenzoS

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Hi maru,
at this moment I have no a specific situation with "dielectric material close to metal".
But i think that in nature there are a lot of dielectric materials close to metal?

I try to explain in my poor english what I want to say:
In some cases I try to make a material (I  don’t know in advance if it will be metal or dielectrit ) so have to play with ior from 2 to 4,
I have the following situation:

- using legacymaterial increasing the ior no problem, I increase ior for example 2,5-2,8-3,0-3,2...etc. No problem, the material became step by step more and more metallic in “linear” mode.
- using physical material  and increasing the ior all ok up to 3 but if I need the ior more then 3 I have to switch to metal material  I note a too big step on becaming metal from dielectric.


Try yourself, start with a physicalmaterial,
start with non metal with ior close to 3
suppose you need a little more reflection but 3 is not enougth
at this point you can switch to metal but if you do that the material change drastically.

Maybe my workflow is wrong.

2021-02-02, 15:40:36
Reply #7

maru

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at this moment I have no a specific situation with "dielectric material close to metal".
A specific situation would be great. Otherwise, I am not sure how explain to our developers why users may need this change.

Quote
But i think that in nature there are a lot of dielectric materials close to metal?
Could you give me a few examples?
https://refractiveindex.info/?shelf=main&book=Ge&page=Aspnes
There is Germanium, which is a weird material type and an exception on its own. But I somehow doubt there will be many users specifically creating Germanium in their scenes.

Quote
I try to explain in my poor english what I want to say:
In some cases I try to make a material (I  don’t know in advance if it will be metal or dielectrit ) so have to play with ior from 2 to 4,
Again, "some cases", "I don't know", "play with ior". Those are not really valid arguments.
Marcin Miodek | chaos-corona.com
3D Support Team Lead - Corona | contact us

2021-02-02, 18:39:48
Reply #8

LorenzoS

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In attachmet you find a material used  as proposal to my client (architects studios) of a design object,
all ok,color, anisotropic effect etc. but he want a little more near to metallic effect.
How can I manipolate the material to increase a bit the reflection?
I know I can activate the clearcot layer, but I don’t think this is a correct solution because the material will not varnished.
Don’t ask me what material is this in nature, if it’s physically correct etc
My client want that kind of material, and I have to make wath he want.
Yes I can tell that maru say that materials with ior near 3 are not common materials, but….:).

Ps: with legacymaterial increasing a bit the ior I solve the problem.

2021-02-02, 21:14:57
Reply #9

burnin

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Forget IOR.
Use color value (0 - 1) for metalness!

2021-02-05, 11:55:16
Reply #10

LorenzoS

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Quote
Please note that you can also map the metalness,

Quote
Forget IOR.
Use color value (0 - 1) for metalness!

Yes now i understand better wath you mean.
In this way i obtain the continuity on switching fron non metal to metal material simply modifyng the map/color on metalness.

thank you