Vray interior help please! (driving me insane)

[cmentz]

So i finally got to start using vray for the first time(maya vray for the time being).

But ran into an issue that i cannot resolve , which is this :

 

Ive got an interior scene with the vray sun&sky as my only light source. Using adaptive DMC ,GI on,Brute QMC as the primary and LC as the secondary.

 

The problem is this :

 

The VraySun only illuminates(burns out if you will) the walls that it lights up and not the floor. However during the GI calculation i can see that it illuminates the floor as it should , but during the final pass it disappears.

 

The only way around it i found was to change the primary to LC aswell , in which case i had to bump up the samples to ultrabizmillion to get the same quality and sampling that Brute or Irradiance would give me. Which obviously made for lightyear renders.

 

Ive attached 2 mock-ups of the problem :

 

 

First showing what i get(no floor illumination)=

[ATTACH=CONFIG]39742[/ATTACH]

 

 

Second what i want(floor illumination but with brute or irradiance instead of LC)=

[ATTACH=CONFIG]39743[/ATTACH]

 

 

Any help would be greatly appreciated.

 

Kind regards

Chris

[Wendelld]

Try using Irradiance Map as the primary and LC as secondary.

[aaronrumple]

Use IR + LC and make sure your are using a linear workflow with correct gamma. I suggest using linear color mapping and outputing to *.exr. Then you can tone map to ballance shadows and highlights to your preference.

[cmentz]

Thanks for the reply Wendell , i have tried that but to no avail. Thus far the only thing that works is LC + LC.

 

Thanks Aaronrumple , trying your advice as we speak.

 

Appreciated!

[cmentz]

Likewise aaron , still no change. Ive attached another 2 examples of 1.The correct highlights during GI calculation and then 2.How in the final image the correct shadows and highlights are gone. Feels like im missing something very minor

 

Using IR + LC , linear workflow.

 

[ATTACH=CONFIG]39746[/ATTACH][ATTACH=CONFIG]39747[/ATTACH]

[Nic H]

looks like you have no sky illumination at all - only sun?

[cmentz]

looks like you have no sky illumination at all - only sun?

 

 

I deleted the sky just to get the render times down a bit. As ive found it does exactly the same thing whether the sky is enabled or not. The scene is just alot more lit up with the sky enabled , but still no highlights. Any ideas ?

[mattclinch]

flipped normals perhaps? not a vray user, but reflections usually only work on the correct side of normal faces, so perhaps if the light in vray is traced as reflections it might not show direct light on backfaces? i'm just thinking aloud...

[cmentz]

flipped normals perhaps? not a vray user, but reflections usually only work on the correct side of normal faces, so perhaps if the light in vray is traced as reflections it might not show direct light on backfaces? i'm just thinking aloud...

 

Bingo!! And here I was tweaking the render settings till kingdom come...stupid normals.

Thank you SOOO much matt!!!

[mattclinch]

you're welcome.

[Alyosha]

also dont use "linear workflow" checkbox at the color mapping section of VRAY, as far as i'm aware it is not the magic "linear workflow button" but it is instead there for some other mystic purpose and it can just mess things up if not used for that specific purpose

[cmentz]

noted Alyosha Coming from a vfx background i am not completely clueless when it comes to working with linear workflow... or so i think atleast.

 

Thanks for all the help guys!