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Vray Questions
show user profile  npcph
So I purchased and am teaching myself vray. One thing that i have noticed is sometimes the lights in the scene will bleach out a material. what is the proper way to fix this so you don't get a washed out material.
I am using vray 3.30 and basic vraymaterial with a diffuse map and bump map.
thanks
Phil


read 450 times
4/8/2016 4:56:29 AM (last edit: 4/8/2016 4:56:29 AM)
show user profile  9krausec
Turn down the intensity of the light! :D

Make sure you are using the Vray physical camera and you can balance out your shot exposure as you would with a real camera.

Have gamma correction applied on your image unless it has already been gamma corrected for LWF or is an hdr of sorts.

Try applying a texture to your rec light to get a nice falloff if intensity.

Edit: make sure you are using linear work flow is probably one of the most important ones as it will allow your light to travel further in the scene. The sRGB button should be on in your Vray frame buffer at all times for LWF.





- Portfolio-




read 431 times
4/8/2016 1:30:07 PM (last edit: 4/8/2016 1:32:02 PM)
show user profile  npcph
Thanks for the info. I already have the light at 1.0 so turning it down will make the scene to dark.

I am using a vray physical cam so i will look at the exposure, but the only real materials i am having problems with are ones directly facing the light. for example, i have a building and the siding, windows, brick foundation and doors are fine. the roof is very washed out though.

I will look into the gamma correction, and the texture for the light. I will also look into the linear work flow.




read 414 times
4/8/2016 4:15:07 PM (last edit: 4/8/2016 4:15:07 PM)
show user profile  Bolteon
Hard to tell without images...

-Marko Mandaric



read 410 times
4/8/2016 4:34:21 PM (last edit: 4/8/2016 4:34:21 PM)
show user profile  9krausec
LWF is going to make a huge difference on what you are seeing. When I'm working I usually never have my lights set anywhere between 5-120 (depending on size, light purpose and camera settings). If you are experiencing blow out at intensity of 1 then don't bother looking into placing a texture on your light right now.

Focus on getting LWF setup (which includes gamma correcting your texture maps). Back in the days when I used 3ds max I followed these steps for reference on setting up LWF

http://www.workshop.mintviz.com/tutorials/linear-work-flow-and-gamma-correction-within-vray-and-3ds-max/
http://www.neilblevins.com/cg_education/linear_workflow_vray_max/linear_workflow_vray_max.htm
http://www.aversis.be/tutorials/vray/vray-20-gamma-linear-workflow_01.htm

(I've never looked at it, but just saw Viscorbel had an article on LWF. I'd check his stuff out too)-
http://viscorbel.com/linear-workflow-and-gamma/


They should all say about the same jazz, but it wouldn't hurt to go over all of them quickly just to check if there are any differences or to double check setting everything up appropriately. Good luck!


Edit: I lied, I'll set lights lower than 5 every now and then. After talking with a few senior members (Bots and Redstar) about lighting cards, I now use vray lights as lighting cards when needed with a very low intensity... However, I wouldn't recommend doing that if you want to accurately represent the light colors being reflected.




- Portfolio-




read 409 times
4/8/2016 4:36:14 PM (last edit: 4/8/2016 4:43:18 PM)
show user profile  FX
I've just skipped through this but may be useful.


read 365 times
4/10/2016 1:24:14 PM (last edit: 4/10/2016 1:43:00 PM)
show user profile  STRAT
What a faff that video was :P





SJLEWORTHY.COM











read 355 times
4/10/2016 5:15:00 PM (last edit: 4/10/2016 5:15:00 PM)
show user profile  FX
There are those with knowledge and those with the ability to teach, rarely do you find someone with both. :)

He does seem to flit around a lot.


read 337 times
4/10/2016 11:35:08 PM (last edit: 4/10/2016 11:35:08 PM)
show user profile  npcph
Thanks for the information everyone. First of all, this is a sample scene that i made to just test out vray lighting so i know that my materials are not great, i am still working on it. I looked at LWF and was surprised at how simple it was... unless i wasn't doing it right. I did notice a huge difference in the results. I do have a question though. Everything i read says you have to save it as an exr, open in photoshop and then save to tiff, jpg or what ever format you want. problem is that when i do this, i see a huge loss in quality and it gets washed out.

Screen shot from max
 photo lwf question1_zpsrns8bvff.jpg



Screen shot from photoshop
 photo lwf question2_zps11wsbmca.jpg

Any ideas on how to fix this or any other tips to fix it.

Also, when i bought vray, I only got the dongle and a link for a download. i see that they have the documents online, but i was wondering if anyone had a pdf of the manual or knows where to get it. I like killing trees better then reading it online.

read 328 times
4/11/2016 4:04:05 AM (last edit: 4/11/2016 4:04:05 AM)
show user profile  npcph
Ok, i stand corrected. I was able to save directly to jpg with no image quality loss that I could see.


 photo test2_zpsqpo9bwzf.jpg

 photo test1_zpsuacp47ir.jpg

read 326 times
4/11/2016 4:21:04 AM (last edit: 4/11/2016 4:21:04 AM)
show user profile  3Ddeath
Ya dealing with gamma is really annoying, my brain hurts trying to explain it.

Something along the lines of keeping a liner workflow as in the color space has liner lines instead of curved bludges for lines thus lossing color information, and than dealing with gamma being 2.2 on computers.

If you have a washed out EXR I believe you just need to expose it down to gamma 0.45 which is the reverse of gamming it up to 2.2


Portfolio Site
read 323 times
4/11/2016 5:11:24 AM (last edit: 4/11/2016 5:11:24 AM)
show user profile  FX
"If you have a washed out EXR I believe you just need to expose it down to gamma 0.45 which is the reverse of gamming it up to 2.2 "

I've been doing this for years, slightly unsure if it's the 'technically correct' way of doing things but it seems to work. :/


read 302 times
4/11/2016 12:03:01 PM (last edit: 4/11/2016 12:03:01 PM)
show user profile  Bolteon
...most definitely is not.

-Marko Mandaric



read 293 times
4/11/2016 2:37:02 PM (last edit: 4/11/2016 2:37:02 PM)
show user profile  herfst1
if you use PS, then convert to 16bit, and it will pop up with an HDR tab, choose exposure and gamma from the dropdown and hit ok.

But

Use Nuke, it's free for non-commercial.
read 287 times
4/11/2016 2:49:48 PM (last edit: 4/11/2016 2:49:48 PM)
show user profile  FX
It's commercial and I hate nodes.

I don't see the HDR tab..is the result the same as .45 gamma ?

read 281 times
4/11/2016 3:08:12 PM (last edit: 4/11/2016 3:08:12 PM)
 
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