Glossy destroys Lightcache calculation problem

[neoVisual]

Hello all,

I want to report a bug that annoys me for a long time. In some scenes when I use glossy refractions (like the one visible at left image on the ceiling), it seems that glossy material destroys Lightcache solution. During LC computation I get good result to almost 50 percent of status bar, but then LC calculation goes more and more to white dots. Irradiance pass then shows that no secondary rays from LC were used.

Resulting image is dark, with only first Irradiance map solution appearing in scene.


Full res. image here : http://www.neovisual.cz/download/vray_glossy_lc_bug.jpg

When I disable glossy materials in Global Switches, everything renders fine as on the right image.

MAX R6 / VIZ 2005 used with Vray 1.47.03 and also 1.47.13

can someone please give me advice how to get rid of this problem ?

thanks a lot, neoVISUAL

[Morbid Angel]

did you try checking use lc for glossy ? in lc paramiters rollouts.

[neoVisual]

I am trying that now. Thanks for a hint, but I think that will not improve situation anyway.
I let you know when I finish image.

... after some time ...

I checked "use lightcache for glossy rays" and it is worse than before.
that is how LC computation works - notice white dots in preview of solution :

hires : http://www.neovisual.cz/download/vra...g_progress.jpg


Irradiance computation - well here we have even red dots - that was not in image before.

hires : http://www.neovisual.cz/download/vra...progress_b.jpg

Result is dark, bad and with red dots ... so it is worse than before

hires : http://www.neovisual.cz/download/vra...bug_result.jpg

anyone has an idea ?

[Da_elf]

can you pass on a scene file to test?

[Morbid Angel]

hmmmm this is odd...yeah a scene would be good...

[neoVisual]

I sent you an PM. Can you give me your email, so I can send you whole scene ? Or write at
info(here is that spiral sign)neovisual.cz

thanks

[vlado]

If you still haven't solved your problem, it would be best if you can send us a scene to investigate to vray@chaosgroup.com

Best regards,
Vlado

[Da_elf]

well. vlado will let you know how to fix your problem with your current version i hope however it does seem to be a bug but i can say the bug is gone in later versions.

[neoVisual]

Thanks Da_elf, this is exactly what I need

What version did you use ?

I have only 1.47.03 and 1.47.13 as a repair of previous bug ... and with those versions it is a no-go.

I will write to Vlado to supply me your version number

[TRGraphics]

Neovisual, I'm running a recent version as well. If you send it to me, I'll take a look as well.

Tony

[Morbid Angel]

All I can say is I opened the scene and hit render....and i got this: which seems to be correct result, then I went in turn off turn on everything I could think of and did not get the result as you descibe above......
im on vray 1.47.03 ........so I dont know...

[TRGraphics]

Neovisual, you mention two versions, your not running different versions on your farm are you?

[DaForce]

Are you rendering this all on a single machine?

[neoVisual]

I rendered this via backburner - scene has animated camera with 6 views - 2 from those 6 frames are affected by this error. This error appears on every machine that got rendering job of frame 0 and frame 3. Same problem is when I assign that frames alone to single machine or just as a local rendering.

Da_elf, can you say what Vray number did you used for proper rendering ?

Morbid - I don't understand how can you render this correctly on 1.47.03 - I've got error on this version first, so I tried 1.47.13 and error is still here.

neoVISUAL

[Morbid Angel]

maybe its not vray maybe its max? are you on 7.5? im on 7.1