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How to improve render time with over 50 lights in a scene ?

6 REPLIES 6
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Message 1 of 7
Tony_Tsao
2278 Views, 6 Replies

How to improve render time with over 50 lights in a scene ?

I have this scene with over 50 lights (the blue things are the lights)
My render setting: Camera AA 1, Diffuse 4 , Specular 4 , Transmission&SSS&Volume indirect 0 .
every light has only 1 sample value , atmosphere volume sample 6
304-cinema-4d-2017-10-12-18-59-08.png

But the render time is quite slow for just a frame (1920x1080)
Is there a better way to solve this?

305-0-968.png

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6 REPLIES 6
Message 2 of 7
lee_griggs
in reply to: Tony_Tsao

Have you tried increasing the Low Light Threshold?

Does it really need such high Diffuse and Specular samples? The scene doesn't look like it has much bounced light in it.

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 7
Tony_Tsao
in reply to: Tony_Tsao

Thanks so much!
It took almost an hour to render a frame without changing the "Low light threshold" value.
Now it only takes 6 mins a frame . (1920x1080)

Message 4 of 7
cpz
Enthusiast
in reply to: Tony_Tsao

Hi, just read this informative post, can you please explain what circumstances should consider using this parameter, and where to find it,? thank you

,

Hi,I just read this post, can you please tell me where I can find the "lowlight threshold " and what other situations should I consider using this,? thank you

Message 5 of 7
Stephen.Blair
in reply to: cpz

The answer has a link to the doc page. The parameter is in the Advanced section of the Render Settings.

You use it when you have lots of lights, and you think some lights contribute very little to some parts of the frame, and so can be "ignored" (not sampled) at those parts



// Stephen Blair
// Arnold Renderer Support
Message 6 of 7
gshankar165
in reply to: lee_griggs

That's really helps. Low light threshold.

Message 7 of 7
gshankar165
in reply to: Tony_Tsao

Take some test render, sequence render. Try not to increase it too much.

For this scene, i dont think u need shadows, I meant if just off the cast shadows of light, it won't affect that much on overall look.

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