[Radiance-general] Radiosity method implementation on Radiance

[Germán Molina Larrain]

Randolph,

No, that is not my plan... I actually do not know much about artificial
lighting, hahaha.

Christopher,

I have some ideas that I would like to evaluate both in accuracy and speed.
Is not that any other software does not handle well what I am trying to do,
but as you said, I need some procedures and programs that exist in
Radiance, such as evalglare and the Perez model... sacrificing the
specularity is what I meant by "giving up some accuracy".


The advantage that I see on Radiosity+ray-tracing is that the ambient
calculations can be done with radiosity, and the direct calculations can be
done with ray-tracing. By doing that, the ray-tracing parameters are
relaxed, and fast to compute.

When everything is done, it is possible to move and render images fast,
using the precalculated values. This might be important to choose where to
locate furniture, for example.

I am going to stick to what Greg said for now:

*"If you need to compute the illumination of an empty box, then anything is
going to be fast.  If it's really, really important for you to compute
empty boxes in a second or two, then radiosity is the way to go.  If you
can wait 30 seconds, Radiance works, too."*
*
*
If I have time in the future, I will try to test my ideas... whether they
do their job well or not, would you, guys, be interested on having some
radiosity modules here for research purposes?

THANKS FOR COMMENTING ALL OF YOU!

German



2013/6/21 Christopher Rush <Christopher.Rush at arup.com>

> Is the intention to check if speed improvements are possible? It could be
> a lot of work for potentially little gain. Maybe there are already
> validation/benchmark studies that could show it takes X minutes to get
> within 10% of a known solution with radiosity and Y minutes to get within
> 10% of the same solution with Radiance.
>
> Or maybe radiosity is perceived to be faster, but you have a scenario that
> your favorite radiosity software doesn't handle well? Maybe Radiance only
> handles the scenario of interest well because it doesn't use radiosity.
>
> I suppose since Radiance is open source, there is a potential path toward
> implementing radiosity into Radiance - whereas most radiosity software
> (AGI, Dialux, etc.) would not accommodate a homespun version implementing a
> Perez sky for example or outputting an HDR image for use in evalglare.
>
> Keep in mind that adapting Radiance to a radiosity method probably
> requires to ignore (or otherwise account for) the specular reflection
> component defined as part of any material type. In many scenes this may be
> unimportant.
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