VRay Environment Fog and Opacity Maps

[macreation]

I've been playing around with the Environment fog and have noticed that where the gizmo mesh intersects another mesh which has an alpha/opacity map, the opacity is ignored when rendering. Is there a workaround, or is this a bug?



Thanks

Ray

[boyan]

Hey Ray,

Thank you for the feedback. Can you provide the scene file, if it is possible?

BR. Boyan
E-mail: boyan.nalchadjiiski@chaosgroup.com

[macreation]

Hi Boyan,

Here is a dropbox link to the scene in question.

https://www.dropbox.com/s/o3t1wh115q...Scene.zip?dl=0

Thx

Ray

[boyan]

Thank's Ray, I will check it and reply to you. Keep you informed.

BR. Boyan

[vladimir.nedev]

I took a look at the scene and I am not sure whether that's a bug or some sort of sampling error.

You have your fade out radius very high - 2km, while the fog distance is very small - 4mm, with a large step size - 1m.
The docs suggests that the step size should be 2 to 3 times smaller than the fog distance, although this depends on any density textures you might use.
In your case this means 1-2 mm, but even that doesn't fix the issue and is also very slow to render.

I suggest that you reset the fade out radius to 0, and use a large fog distance, something like 1m.
You might have to lower the fog gizmo closer to the ground.

Here is what I got. Note that the gizmo is lowered. I am not seeing the opacity issue.



Greetings,
Vladimir Nedev

[macreation]

Hi Boyan,

Thanks for investigating the issue. I'll give it go.

Ray

[boyan]

Hey Ray,

Yep, Credits are to Vladi Nedev .

Keep posting, your feedback is important for us.

BR. Boyan