More blotchiness at higher quality settings

[blinkimage]

I am preparing an animated walkthrough of a lovely penthouse apartment, but seem to be experiencing more blotchiness with the 'high' preset than with the 'medium' preset. I hope these images will explain.

First is with 'medium' settings:


Second is with 'high' settings:


And here are my render settings. No other changes have been made between each render - just the switch from medium to high.

[7zark7]

You could try setting your HSph. subdivs to 100.

[blinkimage]

7zark7 - I know I could do this, but I just wondered why higher settings would show up artifacts more.

[Gijs]

Hi Blinkimage,

someone correct me if I am wrong, but I think that 90 interpolation samples at low settings means vray will pick more samples farther away from the sample point to reach a number of 90samples, since there are generally less samples around that point than at higher settings.

Gijs

[flipside]

The interpolation samples value determines indeed how many samples ar taken into cosideration while 'interpolating' the lighting info in each sample. So a value of 90 wil result in a very blurry GI. Since you first try the medium preset, which will result in not many samples, your GI info of the whole room is blurred together and you get what looks like 'clean' GI, but it is very undetailed. Then you go to high settings, resulting in more samples, so the blurring of them (interpolating) gets a bit more local so your undetailed GI solution becomes much more visible now, looking like 'dirty' GI.

Look at your first image, it has very large noise kinda GI shadows, but they look completely wrong (corner at ceiling).

I think the problem is the blinds, since much sunlight falls on it and bounces of onto the celing. You get to deal with very much bounced light because of that, so you'll need extremely high settings to get it clean (or very low and blur it like hell but then it will not look right).

I would turn of 'send GI' for the blinds (or the blinds material with a vraymtlwrapper). This way you don't need all these calculations. Then use vraylight, set to store with irradiance map to make up for the lost bounced light.

[vince_1972]

I thing, your skylight multiplier is too hight. Try with 1 or 2 and put your color mapping to ~3

Vince