Author Topic: Noise from the bulb  (Read 4862 times)

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Offline Zvi

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Noise from the bulb
« on: March 13, 2016, 06:10:53 am »
The bulb in the lump creates noise. The scene units are meters, the power of the point light is 1 watt! There is global illumination. No roughness in the materials. How can I avoid this noise?

Offline KeyShot

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Re: Noise from the bulb
« Reply #1 on: March 13, 2016, 06:25:20 pm »
That looks odd indeed. Can you share your model with [email protected], so we can take a look at it?

Offline Zvi

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Re: Noise from the bulb
« Reply #2 on: March 13, 2016, 10:50:47 pm »
I have no problem to share the model with anyone who can help solve the problem.

Offline LayC42

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Re: Noise from the bulb
« Reply #3 on: March 14, 2016, 02:43:38 am »
What do you think about this result?


Offline Zvi

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Re: Noise from the bulb
« Reply #4 on: March 14, 2016, 03:23:14 am »
It looks good. The noise disappeared. Although it is hard to see the translucency. How did you do it?

Offline LayC42

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Re: Noise from the bulb
« Reply #5 on: March 14, 2016, 03:53:21 am »
I did  nothing special. Just
- deleted unwanted parts, the inner parts from the bulb
- changed the outer parts of the bulb to emissive
- changed the light type

You'll see all in the attached bib file

Offline Zvi

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Re: Noise from the bulb
« Reply #6 on: March 14, 2016, 05:17:39 am »
Thanks a lot.
But you didn't delete the inner part from the bulb because you didn't need to, you changed the outer parts of the bulb to flat, not to emissive. I tried this idea of emissive but it didn't help. I also changed the light type, and it didn't remove the noise.
And again, thank you!

Offline Zvi

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Re: Noise from the bulb
« Reply #7 on: March 14, 2016, 10:57:10 am »
Actually, we didn't find a solution for using the translucent material without all the noise, when there are multiple layers of glass.

Offline LayC42

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Re: Noise from the bulb
« Reply #8 on: March 14, 2016, 11:36:35 am »
I don't know why you would use a translucent material for glowing objects?
So a flat material for the bulb with a point light in the center should be enough. Perhaps you can play with a small cylinder inside the bulb as an invisible area light. So you have more control about any shadows.

Please share your test results.

Offline Zvi

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Re: Noise from the bulb
« Reply #9 on: March 14, 2016, 12:08:02 pm »
While in my case the results are satisfying' as you can see in the attached image,  I am worry about the future, in other models, not of bulbs.

Offline Zvi

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Re: Noise from the bulb
« Reply #10 on: March 14, 2016, 01:02:03 pm »
Thank you for the information. It looks nice, but I wanted the bulbs tube to be seen.

Offline LayC42

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Re: Noise from the bulb
« Reply #11 on: March 14, 2016, 02:58:35 pm »
I like Eric's solution. Very good work, I just had time for a quick and dirty solution.

But, if you want to see the bulb spirals, then it doesn't have to glow.  Then will the flat material your best friend.

Offline bdesign

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Re: Noise from the bulb
« Reply #12 on: March 14, 2016, 03:31:14 pm »
Thank you, LayC42. In hindsight I realized that the watts power was too intense, and I had made an error in rebuilding the glass (intersecting geometry). I'll be posting an updated, improved version soon.

Eric