vRay Rect Light problem. Why is this happening?

[XavBo]

Hi guys,

I have a vRay question (MaYa users).

Do you know what is happening here?

I can't understand.

The vRay rect lights are just linked to the guy there.
Why is hitting the floor if the floor is not linked to the rect lights?

The attributes of the light are:
invisible (ON)
affect specular (OFF)
affect reflections (OFF)





Why the light is also hitting the car even if the light is pointing to the guy?
This is way to estrange for me.

1. Do you have any idea why vRay is calculating the diffuse on the floor even if it is not linked to the lights?
2. Why in the render the lights get cut on the floor? If the suppose to diffuse the floor - the lights suppose to be visible in diffuse everywhere.
3. The paint car is also being hit by the light. Even if the light is pointing to the guy.

If you have any idea how to solve this problem, please let me know.

Cheers!

[shaio]

Hi,
Something definitely looks wrong here. I'll try to reproduce the problem on my end and will get back to you with some more info.

[shaio]

I'm not reproducing the issue on my machine. If possible sharing a scene would help a lot on finding what is causing the issue. Also please check if "Ignore shadow and light linking" is set to ON under the Lighting rollout in Render settings -> Overrides tab.

[XavBo]

Hi shaio!

Well I found the problem.
The mesh CAN'T for any reason that I can explain be linked.

Once you have linked the mesh to any light you will see the problem I got.

Before I post the scene just to be sure that this will happen also to you, may I ask you if you can import the obj file to any of your scenes?

Step 1.
Import the mesh in any scene.
Step 2.
Link at least 1 light to the mesh using the Light Link in MaYa 2017
Step 3.
Render the images.


Download the file:
http://www.class-a-strak.com/FAQ/Lig...ots___TEST.zip

Have a look in the video:
http://www.class-a-strak.com/FAQ/Lig...blem___001.zip

[XavBo]

Hi Ivan!
How you doing?

Did you have the change to do some test?

This is hard. Really hard to see this happening.
I need to make a MaYa MR test too.

Please let me know if you had the change to make any test.

Thank you in advance.

[shaio]

Hey,
Sorry for the delay. I tried your mesh and it still works fine on my end. What version of V-Ray do you use? I tried 3.60.02 and 3.52.03 without success on reproducing it.

[XavBo]

Hold on... but why your floor is not visible?
If you render also your floor with the mesh you will see the problem.

You can only reproduce the problem by showing your floor.

[XavBo]

OK. I already solve everything in 2 ways.

The first I refuse to accept or maybe there is a solution for this that I don't know yet.
The second is a lot of work.

1. Please download my scene.
http://www.class-a-strak.com/FAQ/Lig....01___sent.zip

There is a Layer called "Lights_Please_Hide" if you hide all those lights you will not get the problem I have in the final render.
Which I refuse to accept. If I need to have those lights and render at the same time with all the other lights, then those lights need to be visible.

By turning that layer on - you will have the problem.

2. Having all the lights in the scene.
... you need to model your model again. Hoping this is not going to happen again.
So have a happy modeling again !!!!
sometimes MaYa is ...

EDIT:

BTW I'm using VRay 3.60.01 in MaYa 2017

[XavBo]

Have a look into the images below.

As you can see the in the picture below the guy in the back (on the right) is also creating problems for the calculation and this will be reflected in the box.
http://www.class-a-strak.com/FAQ/Lig...2___Render.jpg



The guy in the front (left side) is calculated correctly according to the Light Link assigned.
And you can also see that the wax material reacts properly. The wax material in the back have really problems.

The scene is exactly the same. No changes.
I just made a copy from the guy in the back, moved the guy, the box and the lights to the front.
I have exactly the same amount of light in both models.
They are also Light Linked in the same way.

The scene s build like this.
http://www.class-a-strak.com/FAQ/Lig...__FAQ___02.jpg


By hiding the lights on the top this will not happen.



Problem solved, but... WHY?

[shaio]

I'm checking the scene that you send me. I'll get back to you as soon as I have some information. Thank you for your feedback.

[XavBo]

Nice.
Thank you also for the help.

[shaio]

The problem comes from the Adaptive lights being ON. As a workaround you can turn them off until we find where exactly is the problem and fix it. I'll keep you in touch if there is any new information about the issue.

[XavBo]

WOUH! Well that did the trick too.
I never thought that the overrides will affect the image.

Nice to know.

Thank you in advance!

Cheers!

[shaio]

Well I'm glad I could help. However It isn't recommended turning off the adaptive lighting since it can greatly improve the render times but is the only workaround in your case. I'll keep you posted and let you know as soon as we fix the issue.

[XavBo]

I'm agree.
Is just a workaround.
At least work for the moment, but once the scene will be finish I think the "adaptive" feature will be the best.


I will glad to hear from you soon.

Thnx a bunch!