[Bf-cycles] Complex lighting situations issues_light intensity decreases > number lights increases

[Stefan Werner]

Try setting the clamp direct/indirect render settings to 0, that might make it go away. Stochastic sampling of many lights can lead to very bright individual samples, and when those samples get clamped before added to a pixel, energy (light) is lost.

-Stefan

> Am 12.02.2017 um 10:57 schrieb Guido Medici <guido.medici89 at gmail.com>:
> 
> Hi everyone,
> first of all I’d like to thank you for all the effort you put to constantly develop and improve Blender and Cycles.
> Unfortunately, I’ve stumbled upon an issue that limits the usage of Cycles in complex lighting situations.
> I’ve tried to look for a solution on several different forums, but all my attempts were unsuccessful so I’ve decided to write to you directly.
> I’ll try to explain the issue as best as possible, In this link:
> 
>  http://blender.stackexchange.com/questions/73507/complex-lighting-situations-issues-light-intensity-decreases-number-lights-inc 
> 
> you'll can find some pictures that better explain the problem.
> I have noticed that the more “lights” are introduced in a scene (both interior and exterior) the more the intensity of each lamp is reduced.
> I’ve notices the same issue with HDRI images. Again, adding more sources of light into the scene, results in a decreased intensity of the HDRI image itself.
> Clearly, the problem becomes extremely limiting especially in situations where multiple sources of illumination are required.
> In the attachments I’m showing the aforementioned issue, as you can see the source of lighting (in this case a simple Point lamp) decreases its intensity as the number lights increases. On every picture I’m adding one or more lamps.
> 
> best regards, 
> Guido Medici
>  
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