[Sidefx-houdini-list] windowing shadows in mantra

Andrew D Lyons tstexture at gmail.com
Thu Aug 26 15:14:15 EDT 2010


Yep. It wasn't that hard (well maybe a little), and really should be
in the default Houdini dist IMHO. If enough people ping SESI about it
you know they'll take notice...
:)

On 26 August 2010 11:39, paul flanagan <paulflan at gmail.com> wrote:
> hey Andrew,
>
> nice one! shadow regions are something ive "used" before in another
> studio, and found it great for creature work especially where sss was
> based on shadow map tricks etc..  anyway..  would love to implement
> into the lighting workflow here.. ultimately Im trying to familiarize
> myself with how to build a custom light in houdini..  based on stops
> etc...
>
> p,
>
> On Thu, Aug 26, 2010 at 8:43 AM, Andrew D Lyons <tstexture at gmail.com> wrote:
>> Gah! Had to make a new shadow shader and build a new light. Tigh
>> shadow maps though...
>>
>> On 25 August 2010 12:24, Andrew D Lyons <tstexture at gmail.com> wrote:
>>> Hi,
>>>
>>> With distant lights it becomes desirable to use light window
>>> parameters to create more localized shadow maps. I've come up with a
>>> system to compute the window settings to perfectly frame the bounds of
>>> an object, and mantra will generate the well framed shadow map - but
>>> it will not re-project that shadow map using the same window settings
>>> / projection matrix - and so the shadow in the final render is wrong.
>>>
>>> Does anyone know of a way to get mantra to shadow correctly when
>>> windowing is used to generate the shadow maps?
>>>
>>> Thanks!
>>>
>>> Cheers
>>>
>>> --
>>> =======================================
>>> Andrew D Lyons | Digital Artist | http://www.tstex.com
>>> =======================================
>>>
>>
>>
>>
>> --
>> =======================================
>> Andrew D Lyons | Digital Artist | http://www.tstex.com
>> =======================================
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-- 
=======================================
Andrew D Lyons | Digital Artist | http://www.tstex.com
=======================================



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