[Radiance-general] behaviour of multiple source objects in one scene

[Lars O. Grobe]

Hi folks,

after how many gensky-calls I start to wonder - what does it mean to 
have to source objects (sky & sun) in one scene?

Having one source is easy to get - it takes the bounding box of the 
scene and catches all rays that leave it. Having two....? Is it that the 
order the source objects are defined determine their "diameter"? The 
typical example is the sky and sun combination, both of type source. 
Usually I have the gensky-output first including the sun disk, and the 
hemispheres for sky and ground after that (and added by hand). Does this 
mean that, because of their order in the scene description, the sun 
source is "inside" the sky source? And does it make a difference whether 
the source objects are modified by light or by glow? So if I could 
handle the sun as glow, would it still "override" the sky background 
because of the order of its definition?

Sorry for not finding this out myself now in the source code, maybe 
someone can shed some light on this?

Cheers, Lars.

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