Hi, have you guys noticed that when “dont affect colors” is checked in Color mapping, then no matter what method and burn you choose (reinhard, linear, 0.35, 0.75 whatever)…the render always looks the same? As if this turned off color mapping completely… is this correct? Thanks Martin

Thanks for the reply, Menomonki, yes with a vraycolormap I’ll have a floating input I can have better control of dark values and reflection. but what else? Macker, I know brute force is the solution but I don’t have a super renderfarm and have to stick with irrmap. can’t deliver noisy render or wait too long. Kimgar, I didn’t find the link to Lele test you’re referring to. Can you give some more infos? if you mean how do I start lighting, I usually start with an override material white (230 or 240). Never pure white. is this what was it about? thanks, giacomo

Imho, the only thing wrong with LWF today is the same issue as I “complained” about back when LWF first appeared as something new on these forums, and that is that the usable range of colours is effectively halved, and as some have pointed out here, the severe effects on dark colour fidelity. This combined with monitors not really being calibrated for gamma 2.2 or 1, as some people like to think (I’m finding 1.5 closer to what I want on most monitors), forcing us to readjust in post. That being said, the “old” way of doing things also resulted in post adjustments, mostly the other way, upping gamma, screwing with light falloff ranges etc. is in no way better. With LWF, we at least have mathematically consistent outputs.

[image]Aao Thanks for the reply, Menomonki, yes with a vraycolormap I’ll have a floating input I can have better control of dark values and reflection. but what else? Macker, I know brute force is the solution but I don’t have a super renderfarm and have to stick with irrmap. can’t deliver noisy render or wait too long. Kimgar, I didn’t find the link to Lele test you’re referring to. Can you give some more infos? if you mean how do I start lighting, I usually start with an override material white (230 or 240). Never pure white. is this what was it about? thanks, giacomo Where it gets confusing for me is the 240 for white or what have you. If a white wall has a 60% reflectance value (it does according to Vlado in another thread) then “white” is roughly 153. I think this what an above poster meant when they said half of the colors are essentially removed from Vray, and I don’t disagree there. It would be nice if there was 1 definitive thread that laid it all out. But there’s like 5, and none of them agree on anything making the entire process that much more confusing.

I’ve found the thread (quite long). It seems to be dated. I wonder how many of you do actually use this workflow. I’ll give it a go. I understand that to avoid burnings and keep the render visually exponential the rule is never go over a diffuse & reflection value of 128 to leave some room for the reflection. The question is: don’t I end up having an underexposed image? What to do then? Curves in psp I guess? I’d really like to know and see some renders of people using this method that as Lele explain it’s not scientific but has got its reasons to be. Anyway that could help my lack of definition. A GI obtained from a 240 with has less falloff than a GI obtained bouncing on a 128 white (I’d say grey). I’d like to know if Peter Guthrie, Bertrand Benoit and Alex Roman they do use it… One of the best tool I’ve recently tried is the LWF thick on the color mapping. I know the same Vlado discourage from using it but to me it gives a more predictable response to my reflection. Materials behaves exactly as in gamma 1 but the diffuse and light are corrected. As well the fog color and the fresnel has a better response in my opinion meanwhile with the “official LWF” it seems like that those value works exponentially so to fine tune a reflection you need to go crazy in between the small values of 1 - 5 while changing values from 100 to 255 it gives you a blown out reflection anyway. Just to be redundant, I’ve seen one of the master mentioned above using the LWF thick with the old dark color swatches… x Trixian: I tried my best to be 2.2 compliant with a calibrated Eizo monitor Giacomo.

Brett are you really have set output to 2.2 ? With 1.8 in reinhard and output to 2.2 you make double burn.

[image]Phoenix 2 Beta Splashes Problem Brett are you really have set output to 2.2 ? With 1.8 in reinhard and output to 2.2 you make double burn. not if he saves from the frame buffer to jpg and the like since he just burns it into the image but yes to exr etc will have double gamma

the lele thread is here : http://www.chaosgroup.com/forums/vbulletin/showthread.php?36359-VRay-Sun-Sky-and-Physical-Camera-video-tut-Bonus-Script!/page30&highlight=lele+255+linear but i guess you already found that :slight_smile: it’s pretty long yes, actually 5 years long. with 2.2 vraygamma i still find this method gives me the most contrast, but it is awkward and not very dynamic in a working environment. i’m just curious if people are still using this method with .255 output?

o sorry yes I forgot, since I nowdays always use “dont affect colours”

Thanks for the reply. I’ll try this workflow. Anyway as stated by Lele the value of .255 is relative. I mean it will leave room for highlights as strong as a light 4 times more powerful. Technically I can go with a white .5 if I know that my strongest light is 2x. It is a sort doing an exponential exposure in a linear fashion. You try to contain burning calculating your highlight before doing the lighting. I don’t really understand why it gives you more contrast anyway. Let’s say for example that I have a room with an override material of white 128 and a light with power of 1. Wouldn’t it give me the same render as per the same case but with an override material of 256 and a light of .5? Or, as well, white 64 and light power 2? As well changing the white between those 3 values and compensating with the exposure wouldn’t give me the same result? If linear means that the math is respected I think the above consideration is right. Kind Regards, Giacomo.

"Dont affect colors" problem

V-Ray V-Ray for 3ds Max Issues

Morne April 12, 2012, 6:17am 18

not if he saves from the frame buffer to jpg and the like since he just burns it into the image
but yes to exr etc will have double gamma

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"Dont affect colors" problem

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