Hair Sheen on Poly geo using a normal map in Arnold?

[Greg Punchatz]

We are trying to figure out how to get a hair like sheen using a normal or flow map out of Mari to drive the specular as I have often seen in games. They show using normal maps to drive the sheens direction on a horse in this video.

 https://www.thefoundry.co.uk/case-studies/ready-at-dawn-case-study/

Does anyone know how to get the same effect in Arnold?

Thanks
Greg

[Morten Bartholdy]

Map the Anisotropic specular!?

//MB

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[Orlando Esponda]

Hi Greg,

did you find a way to use vector maps to drive the anisotropic specular direction?  I think it's a very useful way to use anisotropic for organic objects...  the horse example is a good example.  I haven't written before because I don't have the answer but I really appreciate any info on this subject.

Cheers,

Orlando.

On Tue, Aug 23, 2016 at 6:21 AM, Morten Bartholdy <x...@colorshopvfx.dk> wrote:

Map the Anisotropic specular!?

//MB

> Den 22. august 2016 klokken 22:05 skrev Greg Punchatz <gr...@janimation.com>:
>
>
> We are trying to figure out how to get a hair like sheen using a normal or
> flow map out of Mari to drive the specular as I have often seen in games.
> They show using normal maps to drive the sheens direction on a horse in
> this video.
>
>  https://www.thefoundry.co.uk/case-studies/ready-at-dawn-case-study/
>
> Does anyone know how to get the same effect in Arnold?
>
> Thanks
> Greg

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[Oscar Juarez]

I think you only need a black and white ramp to drive the directin.

https://support.solidangle.com/display/AFMUG/Anisotropic+Brushed+Metal

On Fri, Sep 9, 2016 at 5:29 AM, Orlando Esponda <orlando...@gmail.com> wrote:

Hi Greg,

did you find a way to use vector maps to drive the anisotropic specular direction?  I think it's a very useful way to use anisotropic for organic objects...  the horse example is a good example.  I haven't written before because I don't have the answer but I really appreciate any info on this subject.

Cheers,

Orlando.

On Tue, Aug 23, 2016 at 6:21 AM, Morten Bartholdy <x...@colorshopvfx.dk> wrote:

Map the Anisotropic specular!?

//MB

> Den 22. august 2016 klokken 22:05 skrev Greg Punchatz <gr...@janimation.com>:
>
>
> We are trying to figure out how to get a hair like sheen using a normal or
> flow map out of Mari to drive the specular as I have often seen in games.
> They show using normal maps to drive the sheens direction on a horse in
> this video.
>
>  https://www.thefoundry.co.uk/case-studies/ready-at-dawn-case-study/
>
> Does anyone know how to get the same effect in Arnold?
>
> Thanks
> Greg

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> Softimage Mailing List.

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[Orlando Esponda]

Hi Oscar,  yes,  because this map is driving the direction in UV space,  but what if you want to drive it in object/tangent space?  How could you use the vector3 info of a vector map and convert it to b&w (UV space) map?

[Gregor Punchatz]

We found a solution, I will try to remember to post a snap shot of our tree, and how we converted the the rgb channels into the proper gray scale image (I think we wrote a python script, a bit clunky but it worked) 

On Friday, September 9, 2016, Orlando Esponda <orlando...@gmail.com> wrote:

Hi Oscar,  yes,  because this map is driving the direction in UV space,  but what if you want to drive it in object/tangent space?  How could you use the vector3 info of a vector map and convert it to b&w (UV space) map?

El vie., sept. 9, 2016 3:57 AM, Oscar Juarez <tridi.a...@gmail.com> escribió:

I think you only need a black and white ramp to drive the directin.

https://support.solidangle.com/display/AFMUG/Anisotropic+Brushed+Metal

On Fri, Sep 9, 2016 at 5:29 AM, Orlando Esponda <orlando...@gmail.com> wrote:

Hi Greg,

did you find a way to use vector maps to drive the anisotropic specular direction?  I think it's a very useful way to use anisotropic for organic objects...  the horse example is a good example.  I haven't written before because I don't have the answer but I really appreciate any info on this subject.

Cheers,

Orlando.

On Tue, Aug 23, 2016 at 6:21 AM, Morten Bartholdy <x...@colorshopvfx.dk> wrote:

Map the Anisotropic specular!?

//MB

> Den 22. august 2016 klokken 22:05 skrev Greg Punchatz <gr...@janimation.com>:
>
>
> We are trying to figure out how to get a hair like sheen using a normal or
> flow map out of Mari to drive the specular as I have often seen in games.
> They show using normal maps to drive the sheens direction on a horse in
> this video.
>
>  https://www.thefoundry.co.uk/case-studies/ready-at-dawn-case-study/
>
> Does anyone know how to get the same effect in Arnold?
>
> Thanks
> Greg

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