help on light leaks?

by jen_tol84 on Fri Jan 20, 2012 11:24 am

Hello cgp!
I often encounter this problem on lighting. Parang may nagleleak na light pero kong ichechek ko yong model e wala namang butas. Baka may idea po kayo mga master kong paano ito maiwasan. Time consuming pa kasi pag edit pa sa photoshop.
Thanks in advance!

by bokkins on Fri Jan 20, 2012 4:04 pm

babaan mo ang shadow bias ng ilaw from 0.2 to 0.002.

by jen_tol84 on Sun Jan 22, 2012 9:52 am

bokkins wrote:babaan mo ang shadow bias ng ilaw from 0.2 to 0.002.

Sir ginawa ko yong sabi niyo pero ayaw parin. I also tried changing the material to vray override matl and even shifting my camera and sun position gaya ng nasearch ko sa web pero ayaw parin.
Then I found out, through trial and error, that by changing the vray Irradiance map current preset from 'very low' to 'medium' or 'high' the light leak is solved.. Pero tumagal kasi konti rendering time ko. Smile

Baka po may nakakaalam sa mga masters natin technical explanation nito? Thanks!
Ito po pala result (Irr current preset= medium)

by bokkins on Sun Jan 22, 2012 1:10 pm

Pwedeng very low pa din, taasan mo lang ang HSph subdivs at interp samples. 60 30 pwede na.

by celes on Mon Jan 23, 2012 4:43 am

try this approach, and experiment with low settings.

just a hunch

it just means try modelling 1 solid mesh for the wall and awning.

by jen_tol84 on Mon Jan 23, 2012 10:53 am

bokkins wrote:Pwedeng very low pa din, taasan mo lang ang HSph subdivs at interp samples. 60 30 pwede na.

Sir ginawa ko nang 80 40 pero ayaw padin..
By trial and error ulit, nalaman ko na pag binago ko yong ibang values ng basic parameters ng current preset e nawawala yong light leak (see below), and halos pareho lang render time ko sa 'very low' na setting (a minute difference).

Thanks.

by jen_tol84 on Mon Jan 23, 2012 11:01 am

celes wrote:try this approach, and experiment with low settings.

just a hunch

it just means try modelling 1 solid mesh for the wall and awning.

Wow this one works! Even in a 'very low setting'. Since I'm modelling in revit, I did this by hitting 'join geometry' in revit and updating my scene in 3dmax, hit render and the leak is gone. Thanks Sir!

by bokkins on Mon Jan 23, 2012 1:22 pm

ah I see. so it's a bug pala from a revit model. I think that's it. Thanks for sharing this. This is a good reference for future revit to 3ds exports. 2thumbsup

by celes on Tue Jan 24, 2012 6:12 am

Good luck jen, happy rendering Very Happy

by ciaoriki on Thu Feb 09, 2012 5:55 am

light leaks are cause by poor light cache solution, pag artifacts sa irradiance map .

by Bosepvance on Fri Feb 10, 2012 5:28 am

jen_tol84 wrote:
bokkins wrote:Pwedeng very low pa din, taasan mo lang ang HSph subdivs at interp samples. 60 30 pwede na.

Sir ginawa ko nang 80 40 pero ayaw padin..
By trial and error ulit, nalaman ko na pag binago ko yong ibang values ng basic parameters ng current preset e nawawala yong light leak (see below), and halos pareho lang render time ko sa 'very low' na setting (a minute difference).

Thanks.

na-encounter ko na rin ito bro, ina-udjust ko from low to medium ang preset kaya naaayus ang leak pero tama ka medyo tumatagal ang rendering time. Thanks sa new info. try ko ito sa next work ko...

by Bosepvance on Fri Feb 10, 2012 5:31 am

bokkins wrote:ah I see. so it's a bug pala from a revit model. I think that's it. Thanks for sharing this. This is a good reference for future revit to 3ds exports.

in addition lang sir Bokkins pati din po from cad to 3dmax may leak din po. Pero yun nga pag inadjust pataas ang current preset ng irradiance map nawawala ang leak yun lang tumatagal ang rendering time...

help on light leaks?

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