strange behaviour of refractive ocean plane

V-Ray V-Ray for 3ds Max Issues
1

Hi,
I never saw this before. Don’t know what is happening :frowning:
This simple scene. Ball and big plane with water shader.

image.png
image.png955×536 31.7 KB
​
Renders like this
image.jpg
image.jpg960×540 15.8 KB

the yellow color are values above 7,6e+36. :confused:
Please take a look at the scene in attachment. Its Max 24 and Vray 6.20.07
Thanks
ocean.zip (147 KB)

2

Turn on the shader’s “Thin-walled” option.

EDIT: Hm, actually recreating the shader from scratch yields correct results. Not sure what’s going on.

3

It needs to be a water surface so thin walled is not an option here.

4

If you make something like beach it looks like this.

image.jpg
image.jpg872×532 365 KB

With thin walled like this,but then its not water.
image.jpg
image.jpg875×538 44.8 KB
​​

5

And it also doesnt work with thickness. This is super weird.

image.jpg
image.jpg870×533 61.5 KB

Skydome causing this, without it its fine.​

6

Yeah I duno too. Recreating shader on my side doesnt work.

7

Ok so I just found the problem :frowning: Its a bug. Refractive materials created with color management on do it. If you create new material without color management its fine. Interesting is that if you switch color management back on those materials still work the same. Please check the new scene I prepared, I named the materials, so you will know.
ocean2.zip (171 KB)

8

Good catch. I’ll take a look.

9

Are you refering to the 3ds Max color management? I don’t see any difference in the result (artifacts-wise) when switching from unmanaged to either gamma workflow or OCIO.

10

Yes Max new color management.

11

Looks like this on our side.

image.png
image.png710×752 24.4 KB
​​
image.png
image.png698×745 24.6 KB

12

I don’t think color management is involved. It simply changes the color of the inf pixels. I’m getting correct results even if I recreate the shader with your OCIO settings. Are you using any third-party plugins that may be involved?

13

Nope just forest pack and phoenix. But in this scene there is no forest and it doesnt work even without phoenix ocean map. Im sure its color management, because it changes the color swatch and modify its values and even if I put for example 0,8 to refraction its different 0,8 than without color management :confused: Not sure why.

EDIT: I can set higher values than 1 in color swatch with this setting of color management. In in test material everything is below 1 of course.

14

Ok, I managed to reproduce it on a simple scene. It seems to happen specifically with custom OCIO configs and VRayDomeLight. I’ve logged the issue (internal bug-tracker ID: VMAX-14279) for dev investigation.

15

Thanks. Any tip how to workaround it for now?

16

Disable 3ds Max Color Management and use the V-Ray one (Render Setup>Settings>Color Management). Afterward, in the VFB, switch to OCIO display correction and set the Display Device and View Transform accordingly.

17

Yea thats what I was already doing :slight_smile: ok