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Hmm, the lost in ambient can't be due to the ambient raylength itself, but maybe if you enabled dynamic fog and light is subtracted!
Check the 'dont subtract light' in the dFog options if you got some amount of fog.



You can send the parameters to main, render a fast image and save the Zbuffer then.
For antialiasing you might increase the imagesize by 2 before.

Only a few settings does have at all an effect on the mc renderer, there is no ambient shadow that is calculated.. only light will be added from all diffuse rays send out.  So also the ambient shadow settings in the lighting tab have no effect.
The only ways of subtracting light on the way is the dynamic and the depth fog, maybe you got dark depth colors and the depth slider is not at zero position?



A higher MaxL value can indeed lead to darker ambience when walls are hidden that are dark like in this case.
If no object was found until MaxL the background light is added, so this might be the case why it will be darker, but this would be the expected case.
You would have to increase the ambient rays depth count and lighten the diffuse colors maybe.


Should be no difference for this case.

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That was my idea too but i thought the anti aliasing wouldn't be exactly the same and would lead to some edges. But i will test it ...
Thanks again, Jesse!
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Hmm, i have not tested it yet, but with some luck it should fit well.

Yes, i see. I checked it right away my posting. Sent it back and realized the reseted ambient shadow. But the normal fog is totally turned off and black.


Hmmm, i see the functionality and it seems logical to me but it doesn't change the fact that i still miss the option to mix longer rays with faked ambient lights. Well, this case might be an exception but i recognized the same tendency in other - more opened - scenes. Normally i wouldn't say a word because of the option to do multi renderings and layer them. But if you wait .. say 40 hours for a real good high resolution image, this circumstance becomes a theme.

Thanks for your support, Jesse!


Thanks a lot hgjf2!

Hi Jesse,

I know what the problem was. I had a simply too dark texture mapped by color wrap function. It damped the secondary light.
So i just made this texture brighter with less contrast. Here's the result ...



But this was too much for my taste and i mixed these images over 2xAA zBuffer from the normal renderer which seems to work properly with MC images.



Thank you for your efforts.

Thank you Jesse.

The definition of fake? I think every intervention to the original render output like photoshopping a zBuffer map or tuning colors and contrasts is the same 'fake' like changing the ambient light color or ray length in the pre-render tuning procedure. So i suppose rendering itself is the actual fake.

But the real problem is tuning the mc renderer. Do you think it's possible to drill up the mc function and do some internal zBuffer and normalmap masking and layering like you did in the standard renderer? Internal multipass might be the right therm. Well, i know it isn't possible to change (for example) the highlight specular value on the fly because it has to be calculated slowly within the whole mc render process but it could be possible to layer it internally and change its opacity or do even a gamma correction to fake its specularity afterwards. The same with reflections for example. OK, it could look more and more like a fake if then someone tunes such layers in extreme directions where it stands out that the whole lighting impression can't be true. But tuning mc has more of a subtle affair where small changes don't look faked but make the big difference.