Hello,

I found a solution: Bounding the plants in a box which does not hit the clouds
helps. However, I still don't know why ...


"Sereib" <nomail@nomail> wrote:
> Hello,
>
> I have scene with some plants (many triangles) on the ground, and clouds (a
> stretched box with scattering media) in the sky.
>
> The plants alone render very fast (> 10.000 pps), and clouds alone also.
> However, if I put both elements to the scene, rendering becomes very slow (< 200
> pps).
>
> I tried putting both elements in two different light_groups, such as:
>
> light_group{ light_source{ L1} object{Plants}}
>
> light_group{ light_source{ L2 } object{Clouds}}
>
> but this did not help. I might add, that the lower border of the cloud-box is
> much higher than the upper border of the plants. Adding "no_shadow" to both,
> plants and clouds, also does not help. Photons and radiosity are also switched
> off for this scene.
>
> Any idea what's the reason for this slow-down, and what would help? To my
> opinion, there should be no interaction of both, plants and clouds, during
> rendering.
>
> Thank you!

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