rim material with brazil

[Khepri]

create a brazil test mat, and put a fallof material in the reflect slot, set it to fresnel and increase the IOR so that you have near 100% reflectivity.

now add a noisemap(set to 0.05(or even smaller) to the bumpmap slot.

render

hope this helped any

[qu2k]

ior dosent do anything unless your object is transparent.

and i wouldnt reccomend a standard noise for the bump, most likely you would want a series of very thin circles to get anisotropic highlights

also i would reccomend you dont use that texture for the ground, it is very noticible that it tiles

[Khepri]

ior dosent do anything unless your object is transparent.

when your using the falloff map fresnel function IOR DOES do alot(increase decrease the fresnel funtion and thereby increasing/decreasing reflectivity).

and I WOULD reccomend the standard noisemap because at this scale you wont notice the anisotropic reflection/highlights.

and what are these thin circles your talking about? :surprised

cheers

[Nosalis]

As I think , the IOR is Index of reflection, so it changes a material, but I wouldn`t say, that is set up how much it reflects. Colors do the reflection amount. IOR only setups how "fast" the reflections fall off :)

[Aearon]

As I think , the IOR is Index of reflection, so it changes a material, but I wouldn`t say, that is set up how much it reflects. Colors do the reflection amount. IOR only setups how "fast" the reflections fall off

the new definition of nitpicking :thumbsup:

[guillaume]

it's not the indice of refraction ?
i never heared about an indice of reflexion but may be i mistake

[drewbie]

Sorry guys, but reflection is calculated with the fresnel formula using a complex index of refraction.


Check table 4.1 on this page for some values used on certain metals:
http://www.crosslight.com/manuals/apsysman/node41.html

[funchski]

This is based on my experience with the BRAZIL test/standard mat, and a long time of following GHOST/BRAZIL since its inception.
I think that the new BRAZIL ADVANCED mat behaves a little differently.
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In BRAZIL, when you put a FALLOFF (fresnel) map in the reflection slot, altering the IOR DOES directly affect the level of reflection.
The default setting of 1.55 will give a light reflection, whereas a setting of 10 will be almost totally reflective ( kinda chrome ).

I'm not sure if the raytrace material that ships with MAX behaves in the same way, but this is how it works in BRAZIL.

++++++++++++++++++++++++++++++++++++++++++

To add variation, you could add a small NOISE map to the bump channel, with a low multiplier 4-10 ( as mentioned by KHEPRI ), and perhaps a MASK map for the reflection channel. Try using the same NOISE map as for the bump channel, or maybe CELLULAR.


Mark

[guillaume]

sorry for my very poor english !
i thank all of you for helping me

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