shadows and GI

[s0real]

is there a way to adjust the sharpness of shadows when using GI without any other lights?

(just a standard white BG for the GI)

[natty]

by refining you irr map setting's ...

[s0real]

i've played about a bit, but can't get really sharp shadows...

current settings are;

first bounce 1.0 medium preset
HSph 50
Interp. 50

second bounce 0.5 Global photon

i'm guessing that a setting where i acchieve sharper shadows, i'll get longer rendertimes, so i may as well use a light... correct?

[natty]

yeah i would say it probably best to use a light as well as skylight .. depending on what you are doing.

[s0real]

just some really simple renders on a white background...

i wanted a bit of shadow on the floor around the objects and they look a bit floaty at the moment just with gi.

i'll make a simple light setup with area lights or somethnig instead.

cheers.

[flipside]

most important are the min max settings of the irradiance map, depending on the resolution (-3,1 gives very sharp results on 640*480 to 800*600 resolutions)

Note that skylight shadows are always very soft as the light comes equally from all directions.

[s0real]

cheers flipside,

i'm getting much better results now.

[samuel_bubat]

Hi there,

some little tips to get more details in the shadows.

decrease Interpolation samples
increase HSph. subdivs
increase "Calc pass interpolation samples"
and switch Interpolation Type to "delone" triangulation.
If you get splotches... increase HSph. subdivs.

and of course as pointed above... adjust your min max settings

This won´t dramatically increase your quallity, but it´s
a bit more realistic in very small details and hard corners.
(expect higher rendertimes !!)

cheers

[tom schuelke]

Hi

Well this washed out gi look , vray sometimes produces often is a point of criticism for brazil users, when they talk about vray. "it only is so fast because it blurres the gi solution ".

Well they are somewhat right here. As long as you use i-map also with high setttings, you blur your i map.

But you can tweek vray to produce as sharp detailed shadows as brazil. Use very high settings, and after this switch to custom, like said, use delone triangulation and also increase Hspsubdevisions, and also a bit your thresholds. This way you are as slow but also as detailled as brazil can be.

well it works this way .Vray can get as fine details as brazil, but other way arround, brazil seems not to be able to produce such artefactfre very fast renderings as vray.

So i think this point goes to vray.

(well and with coming lightmap, you also get such fast results very easy in interior scenes with very very smal work for setup.)

my vote for vlado and peter for president

tom from Hamburg

www.lichtecht.de