Hi! every body!

I have this scene in .pov format( Earlier it was in .obj), which works well in
Windows executable pov-ray but i want to switch over to the povray source code
using MSV Studio.SO that I can easily use Torrance - Sparrow BRDF Reflectance
Model.

Can u suggest me how to do it??

Thanks
Regards
...................
Ran

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here_I_am wrote:
> Hi! every body!
> 
> I have this scene in .pov format( Earlier it was in .obj), which works well in
> Windows executable pov-ray but i want to switch over to the povray source code
> using MSV Studio.SO that I can easily use Torrance - Sparrow BRDF Reflectance
> Model.
> 
> Can u suggest me how to do it??

What?!?!?  Please read <http://catb.org/~esr/faqs/smart-questions.html> and 
then ask again.

	Thorsten

Post a reply to this message

here_I_am wrote:
> I have this scene in .pov format( Earlier it was in .obj), which works well in
> Windows executable pov-ray but i want to switch over to the povray source code
> using MSV Studio.SO that I can easily use Torrance - Sparrow BRDF Reflectance
> Model.

I presume that you want to modify the source. This is probably not trivial,
depending on your requirements. I would question whether you can 'easily'
use the above model - I have not evaluated what would be required to
integrate it into the source.

Can you clarify exactly what you want to do?

-- Chris

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"here_I_am" <nomail@nomail> wrote:
> I have this scene in .pov format( Earlier it was in .obj), which works well in
> Windows executable pov-ray but i want to switch over to the povray source code
> using MSV Studio.SO that I can easily use Torrance - Sparrow BRDF Reflectance
> Model.
>
> Can u suggest me how to do it??

if what you want is to implement "Torrance - Sparrow BRDF Reflectance Model" in
the povray source code, go ahead.  But my gut feeling is that you're not a
programmer and doesn't even know what you're talking about or the kind of work
and challenge involved in making such an implementation.

Post a reply to this message

"nemesis" <nam### [at] gmailcom> wrote:
> "here_I_am" <nomail@nomail> wrote:
> > I have this scene in .pov format( Earlier it was in .obj), which works well in
> > Windows executable pov-ray but i want to switch over to the povray source code
> > using MSV Studio.SO that I can easily use Torrance - Sparrow BRDF Reflectance
> > Model.
> >
> > Can u suggest me how to do it??
>
> if what you want is to implement "Torrance - Sparrow BRDF Reflectance Model" in
> the povray source code, go ahead.  But my gut feeling is that you're not a
> programmer and doesn't even know what you're talking about or the kind of work
> and challenge involved in making such an implementation.

Well this is undoubtedly true that I am not that gud in ray-tracing right now
but I am trying my best to get into this.

Basically The thing is as of now I've this scene file of a human face along u-v
coordinates and I have done texture mapping over the scene. Hence, the model is
human face with its texture and shadow map but that doesn't look any way close
to real face I mean that it has plasticity kinda look.
And my sole purpose to use Torrance-Sparrow BRDF model is to make this face
model somewhat more realistic.But I am not sure how implement that.

I believe now you've pretty much idea about my situation.So, please give me some
suggestion over it.

Regards

Ran

Post a reply to this message

"here_I_am" <nomail@nomail> wrote:
> human face with its texture and shadow map but that doesn't look any way close
> to real face I mean that it has plasticity kinda look.
> And my sole purpose to use Torrance-Sparrow BRDF model is to make this face
> model somewhat more realistic.But I am not sure how implement that.

you see, you don't know what you're talking about.  Why do you think the
Torrence-Sparrow BRDF model will help you getting away from the plastic look?

What you really need is a BSSRDF (subsurface scattering).  Look here for the
comparison:
http://graphics.ucsd.edu/~henrik/images/imgs/face_brdf.jpg
http://graphics.ucsd.edu/~henrik/images/imgs/face_bssrdf.jpg

from the man himself, Henrik Wann Jensen, the father of photon mapping and
subsurface scattering models...

Post a reply to this message

"nemesis" <nam### [at] gmailcom> wrote:
> "here_I_am" <nomail@nomail> wrote:
> > human face with its texture and shadow map but that doesn't look any way close
> > to real face I mean that it has plasticity kinda look.
> > And my sole purpose to use Torrance-Sparrow BRDF model is to make this face
> > model somewhat more realistic.But I am not sure how implement that.
>
> you see, you don't know what you're talking about.  Why do you think the
> Torrence-Sparrow BRDF model will help you getting away from the plastic look?
>
> What you really need is a BSSRDF (subsurface scattering).  Look here for the
> comparison:
> http://graphics.ucsd.edu/~henrik/images/imgs/face_brdf.jpg
> http://graphics.ucsd.edu/~henrik/images/imgs/face_bssrdf.jpg
>
> from the man himself, Henrik Wann Jensen, the father of photon mapping and
> subsurface scattering models...


I have been through those paper..and now I understand what I basically want to
do.
Basically I have this rendered model with ray traced and shadow map.
What I want to do next is to find surface interaction with light...the surface
reflectance with Blinn-Phong BRDF model...and as far as I understand I have to
I have use Monte-Carlo integration through out the surface and I am not sure
how to implement that in pov-ray.

Could you please give me a direction??

Post a reply to this message

here_I_am wrote:
> "nemesis" <nam### [at] gmailcom> wrote:
>> "here_I_am" <nomail@nomail> wrote:
>>> human face with its texture and shadow map but that doesn't look any way close
>>> to real face I mean that it has plasticity kinda look.
>>> And my sole purpose to use Torrance-Sparrow BRDF model is to make this face
>>> model somewhat more realistic.But I am not sure how implement that.
>> you see, you don't know what you're talking about.  Why do you think the
>> Torrence-Sparrow BRDF model will help you getting away from the plastic look?
>>
>> What you really need is a BSSRDF (subsurface scattering).  Look here for the
>> comparison:
>> http://graphics.ucsd.edu/~henrik/images/imgs/face_brdf.jpg
>> http://graphics.ucsd.edu/~henrik/images/imgs/face_bssrdf.jpg
>>
>> from the man himself, Henrik Wann Jensen, the father of photon mapping and
>> subsurface scattering models...
> 
> 
> I have been through those paper..and now I understand what I basically want to
> do.
> Basically I have this rendered model with ray traced and shadow map.
> What I want to do next is to find surface interaction with light...the surface
> reflectance with Blinn-Phong BRDF model...and as far as I understand I have to
> I have use Monte-Carlo integration through out the surface and I am not sure
> how to implement that in pov-ray.
> 
> Could you please give me a direction??

It is really *pointless* for anyone to give you that direction as it is 
everything but trivial. You questions leave no doubt that what you are 
trying to do is well above your head given your current level of knowledge. 
You first need to understand far more basic things:

Start by reading the books in the POV-Ray documentation (i.e. at 
<http://www.povray.org/documentation/view/3.6.1/211/>).

And please *read* <http://catb.org/~esr/faqs/smart-questions.html> as I 
strongly recommended before already.

	Thorsten, POV-Team

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"here_I_am" <nomail@nomail> wrote:
> Hi! every body!
>
> I have this scene in .pov format( Earlier it was in .obj), which works well in
> Windows executable pov-ray but i want to switch over to the povray source code
> using MSV Studio.SO that I can easily use Torrance - Sparrow BRDF Reflectance
> Model.
>
> Can u suggest me how to do it??
>
> Thanks
> Regards
> ...................
> Ran

Hi Ran,

try to look at this (http://www.luxrender.net). It's new, it's free, it's open
source, a lot of people is currently working on it ....

Here some features:

http://www.luxrender.net/index.php?option=com_content&view=article&id=49&Itemid=59

Regards

Delle

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