Zoly nous apporta ses lumieres en ce 2007/08/31 12:49:
> Hi,
> 
> I am finishing a set of scenes that make intensive use of radiosity as the 
> light comes from outside of the space that I am designing. To allow more 
> light to enter through the windows, I am applying radiosity in 2 steps:
> 
> 1. Render without windows storing the radiosity info (save_file)
Windows without the "glass" pane.
> 2. Render with windows and reading the radiosity info from the file 
> (load_file).
> 
> I have some doubts about how storing radiosity info works. I would 
> appreciate some lighting (in my mind):
> 
> 1. What radiosity parameters have influence on the info that is stored in 
> the file (all of them?)
All of them.
> 2. What radiosity parameters have influence on the image if I am using 
> load_file?
Any can have an effect, when there is a need to gather some extra samples.
> 3. Does the info in the file overwrite the radiosity parameters in the SDL 
> code?
NO.
> 4. Can I make the first step at a lower size than the second step?
Absolutely. You can also remove any AA.
> 5. Does it matter where I put the parameters load_file and save_file in the 
> code (after the actual radiosity parameters, after them, ...?
load_file
radiosity parameters
save_file
or
radiosity parameters
load_file
save_file

If you save_file before load_file, you may reload the data you just saved.
> 6. If I get some artifacts in the first step, may I remove them in the 
> second one?
The second step will gather additional samples if needed. They may, or not, 
remove or reduce those artefacts.
Use high quality parameters in the first pass, and more relaxed ones on the 
second pass.
In the first pass, remove any flat transparent, colorless, objects. Reflective 
objects should have the texture replaced by a plain white one IF they are far 
from bright surfaces: high ambient ones.
Keep shaped with ior or colored transparent objects as they actively change the 
radiosity samples. Also, keep non-flat reflective
> 
> Thanks for your help,
> Zoly 
> 
> 
If you also use photons, you must keep any object that is a target for the photons.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you have ever brought your 
computer to its knees by mistakenly launching 64 simultaneous frames to be 
traced, while trying to maximizing the benefits of parallelizing them.
Carsten Whimster

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