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I rendered this one in 2055*1032 px for 870 min, somehow when I get back to office the other day, the rendering is about to finish, then I wait for a while ....

The S.L. is 25 with one planar light solely, but the rendering screen showed me only 8 level processed ! So the rendering looks pretty noisy. I just stopped it as I cannot afford that much of time in rendering.

In some other thread, I found some nice rendering using less time to render, but with a lot less noise ! Should I reduce the S.L. to approx 16 ?

Do you have used a glass window? If yes, remove it.

There is no dielectric material used, nor any glass material.

remove the wall one the opposite side of the light

tom wrote:remove the wall one the opposite side of the light

Would it reduce the noise ? How come ?

try

tom wrote:try

Rite, seems that I need to ask my boss to get me one more computer.

(if not already) Try using an emitter plane on the window instead of skydome.

Thomas An. wrote:(if not already) Try using an emitter plane on the window instead of skydome.

Yes, this is exactly what I've done, there is only one planar light outside the window, no skydome.
Anyway, I hid the wall to the opposite of the window and apply a skydome of intensity 50 (white light) but my rendering runied yesterday due to the TIFF LZW compression error....I'll give it a try on .tga tonite.