[Radiance-general] ambient setting for very large scenes

[Jack de Valpine]

Hi Rob and Jelle,

Although I have not tried this, what about rendering a light probe of 
the exterior environment (using parameters suitable for an exterior 
scene) and then using the light probe to supply the background for the 
interior scene?

-Jack

Rob Guglielmetti wrote:
> Jelle Feringa / EZCT Architecture & Design Research wrote:
>>
>> I’m struggling a little with setting my ambient parameters.
>>
>
> Join the club! =8-)
>
>> Which in my scene would lead to a –ar setting of ~5000. Which seems 
>> absurd to me.
>>
>> So what would be the appropriate thing to do here?
>>
>
> Absurd it is. This is a problem when you have a scene like yours. You 
> want some distant object or scenery to be visible out the window, for 
> example, so you put it in your model and then the images seem really 
> flat or have light leaks because the -ar isn't high enough. One thing 
> you could do is cheat, and place the objects closer to your area of 
> interest than they really are, scaling them up a bit. This works for 
> treelines and things like that, anyway. Another would be to exclude 
> the distant objects from the ambient calculation with the -ae option, 
> the problem there (and maybe some folks here have input on this) is 
> that your objects are outside, your area of interest is inside, so 
> your -av is likely to be too low for the exterior objects (which is 
> how all the indirectly lit surfaces derive their radiance information 
> when their materials are on the -ae list).
>
> -ar 5000 would take forever to render!
>
> Good luck, Jelle.
>
> - Rob
>
>
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