Anisotropic dials

[nickjamesgordon]

Hello,

Struggling to achieve a Anisotropic brushed metal effect within Vray.
Can anyone point me in the right direction?

I notice you can use a specific UV, or local object axis for example.

I can't share the scene, but also probably struggling with the lighting setup... so any 'cheats' appreciated!

Best,

Nick

[boyan]

Hey Nick,

Thank you for the post. Well, you can try doing something like me and let see what will be the end result. I've been added the texture map to anisotropy angle slot.

Check this out: https://my.pcloud.com/publink/show?c...pgqOVm1V8tJqHy

Cheers,

[nickjamesgordon]

Hi Boyan,

Thanks for the reply!

Would this be the same approach to get the top looking like this?
It's the radial effect I'm stuck trying to 'bring out' of the scene...

Best,

Nick

[boyan]

Hey Nick,

Would this be the same approach to get the top looking like this?

Yes, it is. You need to find a proper texture - radial as I see.

I will try to find a procedural method, later.

Cheers,

[boyan]

Hey, Nick

As the attached file is the sample file with how to make the effect. Happy rendering



Making an anisotropy metal effect.zip

Cheers,

[nickjamesgordon]

Great, thanks Boyan!

[nickjamesgordon]

Hi Boyan,

Trying to reproduce this with RT GPU.
Is there something I need to change?

Best,

Nick

[nickjamesgordon]

Anyone able to help?

[boyan]

Hey, Nick,

Sorry for delay.Well, if you use my scene you should change texture projection type to UV Map, you have to make and decent UV texture map as well.

Cheers,

[Robert]

Also rotation map is a black white imput. Not sure why you used a colered texture. In general so, you get much quicker help in the Skype group, incl. Samples etc. Also check youtube tutorials.

[nickjamesgordon]

Hi Boyan and Robert.

Still stuck on this, I'm trying to get the top of the dial to reflect as a 'Anisotropic brushed metal effect'.
Your test scene works great in CPU, and breaks in GPU



Tried various UV tweaks, but unsure how V-ray goes about faking/creating this effect.
There's a really odd way of doing this for the Modo Renderer for example...

Best,

Nick

[vladimir.nedev]

A few pointers, some already mentioned above:

1. Use a greyscale texture for the anisotropy direction. V-Ray doesn't use the same format as Modo, so colors have no effect. Just search 'vray anisotropy rotation map" in google images.
A quick search tells me that only Modo uses this strange color format for the amount of rotation.

2. Use "UV map" projection on the GPU, this is true for all textures, not only those used for anisotropy rotation.

3. Boyan's scene uses a "Low value' of -500% for the anisotropy rotation texture, and it seems V-Ray GPU interprets negative values for this texture differently compared to CPU, so for now, be careful not to use negative values.

Attaching a simple scene that matches in CPU and GPU.
It has two anisotropy rotation maps you can switch between - one downloaded from the internet and the other one I made using a "Conical" gradient in Paint.net.

Greetings,
Vladimir Nedev

[nickjamesgordon]

Thanks Vladimir, can you re-send the zip?
It's missing the gradients...

Best,

Nick

[nickjamesgordon]

A few pointers, some already mentioned above:

1. Use a greyscale texture for the anisotropy direction. V-Ray doesn't use the same format as Modo, so colors have no effect. Just search 'vray anisotropy rotation map" in google images.
A quick search tells me that only Modo uses this strange color format for the amount of rotation.

2. Use "UV map" projection on the GPU, this is true for all textures, not only those used for anisotropy rotation.

3. Boyan's scene uses a "Low value' of -500% for the anisotropy rotation texture, and it seems V-Ray GPU interprets negative values for this texture differently compared to CPU, so for now, be careful not to use negative values.

Attaching a simple scene that matches in CPU and GPU.
It has two anisotropy rotation maps you can switch between - one downloaded from the internet and the other one I made using a "Conical" gradient in Paint.net.

Greetings,
Vladimir Nedev

Thanks Vladimir, can you re-send the zip?
It's missing the gradients...

Best,

Nick

[vladimir.nedev]

Oops, sorry about that.

Greetings,
Vladimir Nedev