Not enough black color variations when using LWF

V-Ray for 3ds Max V-Ray for 3ds Max :: General
1

Hi guys,

i am hitting an issue with not enough black color grading when using LWF (LUT pref 2.2,2.2,2.2), color mapping linear 1/1, gamma 2.2, affect colors on, subpixel off, sRGB on.

basically if i have an object that bears color 0,0,0 (pure black) it doesnt seem to get any GI and i cant see direct light on it (only some reflections)

if i shift the objects color and givit a value 1 (1,1,1), then at automatically pics direct light and GI BUT…its WAAAAAYYYYYYY to light for a black object in real world situation

looks like there is not enough “steps” of black between a value 0 and 1…

as per this example below, where the corten metal has

diffuse RGB value 0 on the left / diffuse RGB value 1 on the right

936×315 45.9 KB

Any tips or hints on this???

Thans a nd sorry if this has been discussed before but i just could not find it anywhere in the forum.

Best Regards

2

Well, you can use VRayColor to set float values. The problem is rather that byte has too few values between 0 and 1…namely none :stuck_out_tongue:

Regards,
Thorsten

3

Right i get it :slight_smile: Thanks a lot Thorsten for the tip !

4

wow :slight_smile: this really brightened my day…completely forgot about the float values

5

I’m quite interested in this…

So simply using Vray Color instead of max color can solve this issue?

Seems it would make sense for a pure black object to not bounce light as it’s absorbing all of it.

6

Yes it does indeed but the step from 0 to 1 was just way too big. Wiith vray color its completely different story :slight_smile:

7

You don’t even need VRayColor necessarily. There are float color pickers for max if i am not mistaken. While the controls are byte style, max does handle float properly internally. Check CoolPicker for example. (Available via maxplugins.de)

Regards,
Thorsten

8

This has bugged me since i switched to linear! I just thought it was down to something i had to fix in post. Thanks Thorsten!

/b

9

I still cant use Vraycolor. I always mix if to paste color forst and than choose gama or the inverse.
How do you use it?

10

in this case i dont play with the gamma at all Pixela, i just use very low values for the black and leave vraycolor plugged into the diffuse slot.