[Bf-committers] Volume Rendering Updates

[Aurel W.]

Another problem I got, I have no good idea, how to add baking of radiance cache.

So basically, the radiance cache, is aligned with the global bounding
box of one object. For a relative static scene, including light
sources and a static volume, this radiance cached can be cached or
baked for several frames. For each frame, simple volume ray casting
without shading each sample point can then be done, which is of course
way faster.

For a moving camera relative to the volume, this would currently only
work with isotropic scattering, because I don't save the angular
distribution of radiance. When doing multiple scattering, this would
also be inherently isotropic. Doing this for the anisotropic case
would be just way more advanced than this simple solution.

For my purpose it was sufficient to just specify two cache files for
the ms and ss radiance, compute and dump the cache in a binary format,
when those files weren't in existence and load them, if they weren't.
But I wonder, how to include this properly,.. should I come up with
some cache file format, do this with baking, etc?

Currently I also did just one completely normal render pass and dumped
the radiance cache on the first frame,... but it may be more
appropriate, when there is some baking option, that I don't do a full
render, but just compute the radiance cache for selected objects.

aurel

On 24 January 2011 18:32,  <raulf at info.upr.edu.cu> wrote:
> Hi Aurel :)
>
> Improvements are allways wellcome, thanks!
>
>> I have written a documentation back then, which is full of other
>> details of the related project and a more general discussion on volume
>> rendering. But in the volume rendering section, there should be a good
>> explanation of my work:
>> http://atommuell.mum.jku.at/~aurel/VolumeScatteringSimulation.pdf
>>
>> Again, it's really not an advanced multiple scattering technique,
>> actually quite simple stuff. At the end of the document there are also
>> some more formal tests, which proof the correctness of the single
>> scattering implementation by comparing it to analytically solved
>> scenes.
>
> I must say, is an excelnt paper, I enjoyed a lot reading it, congrats!
> the technique may seems simple but is correct so is a nice adition to our
> model... go for it :)
>
> Cheers
> Farsthary
>
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