Vraylight inside bulb model creates white splotches.

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

Hello,

When I place the lights inside the bulb, I have splotches.

- All scene is standard materials.
_ Vraylights (sphere)
Affect Diffuse
Affect Specular
(Dont) Affect Reflections
Invisible
Units : Luminous Power lm

- Subpixel Mapping (Tried on and off and no help)
- Clamp Output Enabled
- Reflective GI is OFF
- Checked geometry with AO. And all seems fine.
- For the bulb model: removed/kept inside polygons and nothing changed.

There are some other lights in the scene (VrayIES and other VraySphere lights) and they all render perfectly except the lights on chandelier.

Here I enclose a cropped render
- when lights are inside bulb
- when lights are outside bulb
- when chandelier is turned off

Hope to find a solution.
Best Wishes for Everyone and Nice Weekend.

wipinglass.jpg
wipinglass.jpg800×266 45.7 KB

wipoutglass.jpg
wipoutglass.jpg800×266 43.6 KB

wipnoglass.jpg
wipnoglass.jpg800×266 34 KB

2

would excluding the bulbs from the vraylights help?

3

What is the material on the bulbs?

Best regards,
Vlado

4

It is a Vraymaterial:

Diffuse: white
Reflect: white (fresnel: on)
Glossy: 0.99
IOR: 1.8

Refract: RGB 81 (grey)
Glossy: 0.8
IOR: 1.8
fog color: white
fog multiplier: 1

no translucency.

5

I enclose a screenshot of the material settings.

When I turn off bulbs , all renders fine.
I didn’t try excluıding because I would like to have shadows of bulbs.

pixela-43.png
pixela-43.png359×578 10.3 KB

6

Any idea why?

7

Yes, the splotches you get for the same reason that you get them if you use small objects with self-illuminated materials. Since the light is hidden inside the bulb, V-Ray has to find it by trial and error which generates a lot of noise.

One way to work around this would be to make the bulbs not cast shadows and invisible to GI.

Best regards,
Vlado

8

Thank you very much. I will follow your advice and will post the results.
Best Wishes

9

Thanks again Vlado, problem is solved with your advice.