Anisotropic Reflections Instead of Highlight

[soulburn3d]

I'm sure I'm just being stupid and missing the control to do this, but can vray do anisotropic reflections, or only anisotropic highlights? And if it can do aniso ref, how do I turn it on?

- Neil

[kriscabrera15]

Yea u sure can, if u open up the BRDF drop down there u can control rotation and the anisitropy. No need to turn it on

[soulburn3d]

I tried that before and it doesn't seem to do anything. Here's my steps...

1) Make an object to reflect
2) make a ground plane
3) Assign VrayMtl to groundplane, set reflectivity to a high value
4) render, I get the object's reflection
5) Change anisotropy from 0 to 1
6) render, still no change to the reflection.

- Neil

[Mokiki]

You have to turn refl. glossies to at least 0,98 I think in order for the anisotropic to do anything. At least in my experience.

[kriscabrera15]

Yes forgot to mention it is only noticeable when u have some highlights, so u could unlock highlights and set it's to something around .8 or something pleasing and then u could see the rotation happening

[soulburn3d]

Nope, I turn glossiness to 0.9, I get a blurred reflection, but then changing anisotropy from 0 to 1 doesn't change the reflection at all.

- Neil

[Dariusz Makowski (Dadal)]

Turn GLossines to 0.75.
Anistropic to 0.75 and render it then. 1 does not work.

[kriscabrera15]

Yes if am not mistaken 1 won't work try smaller increments like .2 or .5

[kriscabrera15]

And add some rotation also

[Dariusz Makowski (Dadal)]

And add some rotation also

I would suggest mapping out proper rotation coorditantes using uvw...

[soulburn3d]

Thanks DADAL, that was the issue, I was always using a value of 1, so I was never getting any blur. is this a known bug? Should I report it? Certainly wasted a chunk of my day.

- Neil

[grantwarwick]

Technically it should be achieved with bump mapping or high frequency displacement so I'm not sure if it's a bug or a fall back of "faking" the effect.

[soulburn3d]

I reported it as a bug, at the least the values should be clamped to avoid 1 or -1 so we always get some sort of effect.

Thanks everyone for the help.

- Neil

[Dariusz Makowski (Dadal)]

The Anistropic effect is just a SIMULATION. In real world you would need to use displacement and not have to use anistropic effect. Or bump+ slight anistropic effect as far as I know.

Value of 1 its known and normal to not display anything. I think it goes down to maths...

[soulburn3d]

Oh I know the way it works in real life (wrote a tutorial about it a long time ago: http://www.neilblevins.com/cg_educat.../aniso_ref.htm), and I've used bump before to simulate it, but sometimes you just need the fast close enough method If the math breaks at 1, that's fine, I've requested the value gets clamped before 1 so the material is more intuitive to new users.

- Neil