Re: [GSoC 2013] Advanced Rendering Techniques - Skin/Hair

I wouldn't allocate to much time debugging it. It might be quicker to try
and reimplement from scratch.

Good luck,
Alex.

On Sat, Apr 20, 2013 at 11:35 AM, Girish Ramesh <[email protected]> wrote:

> I'll look into it. It can anyway be part of my project proposal along with
> the dual scattering model. Of course, if the gurus at crystal space see it
> as a good project proposal!
>
> Cheers,
> Girish
>
>
> On 21 April 2013 00:01, Alexandru Voicu <[email protected]>wrote:
>
>> There were some issues while generating the second lookup texture. I
>> exported that into a C# project (
>> https://sites.google.com/site/voicualexandruteodor/Marschner_1.0.zip?attredirects=0&d=1)  to
>> try and debug easier. I'm not sure but my guess is that there might be
>> something wrong with the tangents.
>> I spent around 3 weeks at that time trying to implement and debug that
>> shader and then had to move on and work on other features. There might be
>> more examples of Marschner implementations on the web nowadays which you
>> might find helpful.
>>
>> Alex.
>>
>>
>> On Sat, Apr 20, 2013 at 11:15 AM, Girish Ramesh <[email protected]>wrote:
>>
>>> Hi Alex,
>>>
>>> I am familiar with your code and blog, is it possible to understand what
>>> when wrong? Maybe I can try to improve the implementation and add the dual
>>> scattering model as part of the GSoC project this year. Also, the skin
>>> shader implementations does not seem to be based on actual subsurface
>>> scattering but actually on approximations. So, i think it might be better
>>> to have a physically realistic model than just a hack. Thanks for the
>>> reply.
>>>
>>> Regards,
>>> Giris
>>>
>>>
>>> On 20 April 2013 23:33, Alexandru Voicu <[email protected]>wrote:
>>>
>>>> Hi Girish,
>>>>
>>>> Although we have a Marschner shader model, we had some issue with it
>>>> so we defaulted to using Kajiya and Kay shading model which gives
>>>> decent results and is much faster. You can find more about what is
>>>> implemented here: http://hairrendering.wordpress.com
>>>> We also have a SSS shader implementation used for skin based on
>>>> http://www.gamedev.net/topic/481494-sub-surface-scattering-hack--comments-wanted-/
>>>>
>>>> I haven't worked on CS in a while now, so I am not sure what the
>>>> priorities of improving these rendering techniques are for the project.
>>>>
>>>> Cheers,
>>>> Alex.
>>>>
>>>>
>>>> On Sat, Apr 20, 2013 at 10:35 AM, Girish Ramesh <[email protected]>wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I am interested in participating in Google summer of code with crystal
>>>>> space and am interested in developing the physically realistic rendering
>>>>> techniques for hair and skin. I understand that hair was already handled as
>>>>> a GSoC project earlier with the implementation of the Marschner model. I
>>>>> want to upgrade the shader to the dual-scattering model (
>>>>> http://www.cemyuksel.com/research/dualscattering/) which handles
>>>>> multiple scattering in between the hair strands. Another project I would
>>>>> like to work on is the implementation of a sub-surface scattering skin
>>>>> shader similar to this (
>>>>> http://http.developer.nvidia.com/GPUGems3/gpugems3_ch14.html) and a
>>>>> general workflow for skin rendering. I would like to receive some feedback
>>>>> regarding the 2 ideas and feasibility of them as a possible GSoC project. I
>>>>> would first like to receive your feedback before I make my GSoC
>>>>> application. Thank you.
>>>>>
>>>>> Regards,
>>>>> Girish Ramesh
>>>>>
>>>>>
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