There are thousands of lights in my scene. How to speed up rendering

[q976431]

I use 3090
The current scene video memory uses 9GB
But my FPS is only 4
If I turn off light tree, I can get accurate light rendering results, but it renders very slowly.
If I open it, my rendering will be incorrect. I tried to open it and increase its value to balance the final result. But I found that it is not allowed to exceed 8 This makes it impossible for me to take advantage of this function. Can we raise its upper limit. And tell me how to improve my preview results in scenes with more lights

[vladimir.nedev]

How's the light inaccurate when the light tree is enabled ?
Is the final result darker than expected ?
You can try increasing the max sec. ray intensity in order to fix this:



Greetings,
Vladimir Nedev

[q976431]

How's the light inaccurate when the light tree is enabled ?
Is the final result darker than expected ?
You can try increasing the max sec. ray intensity in order to fix this:



Greetings,
Vladimir Nedev

I think it's because after the light tree is turned on, some lights do not participate in sampling, so many lights are not rendered, my picture does not darken, but some lights are not rendered. I raised its upper limit, which is valid, but now it is not allowed to exceed 8, so I can't continue to improve the parameters of light tree

[vladimir.nedev]

I think it's because after the light tree is turned on, some lights do not participate in sampling, so many lights are not rendered, my picture does not darken, but some lights are not rendered. I raised its upper limit, which is valid, but now it is not allowed to exceed 8, so I can't continue to improve the parameters of light tree

All lights are sampled when the light tree is enabled, but not each frame, so you get a noisier image.
If you disable "clamp sec. rays", the result will be entirely correct with the light tree.

In fact, sampling ALL lights without the light tree might be incorrect, since not enough memory will be available for all the shadow rays.
You should always have the light tree enabled for scenes with many lights.

Maybe you can send us the scene with screen-shots explaining which lights don't seem to be rendered ?

I raised its upper limit, which is valid, but now it is not allowed to exceed 8, so I can't continue to improve the parameters of light tree

I put the limit at 8, because more light tree samples further slow down the rendering and you probably won't see a significant difference in the result.
Also, more light tree sample require additional GPU memory (for storing all the generated shadow rays).

Greetings,
Vladimir Nedev

[q976431]

All lights are sampled when the light tree is enabled, but not each frame, so you get a noisier image.
If you disable "clamp sec. rays", the result will be entirely correct with the light tree.

In fact, sampling ALL lights without the light tree might be incorrect, since not enough memory will be available for all the shadow rays.
You should always have the light tree enabled for scenes with many lights.

Maybe you can send us the scene with screen-shots explaining which lights don't seem to be rendered ?



I put the limit at 8, because more light tree samples further slow down the rendering and you probably won't see a significant difference in the result.
Also, more light tree sample require additional GPU memory (for storing all the generated shadow rays).

Greetings,
Vladimir Nedev

The situation I tested seems a little different from what you said
I enable the light tree and disable clamp sec rays。 So many lights in my scene have not been calculated normally.
If I disable the light tree. Thousands of lights in my scene have been rendered normally. They all lit up


Please check the attachment I submitted. I marked the relevant parameter settings in the naming place
In this scene, I set up a lot of lights in these places. No matter how I test it, it seems that it is correct to turn off the light tree. For me, the current problem is that the FPS obtained by turning it off is too low. It took me a long time to get the image. If the upper limit can be increased by 8, then maybe I can always increase this parameter in exchange for the balance of speed and quality?

light tree(off) clamp sec. rays(on). png
This attachment is the rendered image I need. Because I set a lot of lights for the scene

[vladimir.nedev]

Sorry, I don't understand what the issue is by looking at these screen-shots.
We need a scene to investigate.

Greetings,
Vladimir Nedev

[vladimir.nedev]

. If the upper limit can be increased by 8, then maybe I can always increase this parameter in exchange for the balance of speed and quality?

We can raise the upper limit to 16 for the next build, but anything above that will take too much memory.
There needs to be an upper limit.

Greetings,
Vladimir Nedev

[q976431]

We can raise the upper limit to 16 for the next build, but anything above that will take too much memory.
There needs to be an upper limit.

Greetings,
Vladimir Nedev

Well, thank you
I use google translate
Maybe my description is inaccurate. Sorry

In addition, I found a problem
When I use 1 output sequence, if the save path contains Japanese, Korean, Chinese and other characters. Then my image saving will fail.
When 2 is used, it is not affected by this. Is this normal?

At the same time, can you add a function in 1: automatically pause vantage rendering after rendering (equivalent to automatically pressing the pause rendering button of Vantage) so that when rendering is completed, GPU will no longer perform rendering calculation and the temperature of graphics card will be reduced, because video or sequence rendering may often occur in unattended night. In this way, the graphics card can rest after rendering

[Alexander.Atanasov]

Hi q976431,

In addition, I found a problem When I use 1 output sequence, if the save path contains Japanese, Korean, Chinese and other characters. Then my image saving will fail. When 2 is used, it is not affected by this. Is this normal?

No, non-Latin characters should work both in 1 and 2 and this is an overlook on our side. Thank you for reporting it. We will fix it in future versions and will let you know when it will become available.

At the same time, can you add a function in 1: automatically pause vantage rendering after rendering

We have an issue logged for optimizing/reducing GPU usage when not needed and your suggestion is one of the solutions we will try to implement. I cannot say when it will become available but we will inform you when there is some development.

Best regards,
Alexander

[q976431]

Hi q976431,


No, non-Latin characters should work both in 1 and 2 and this is an overlook on our side. Thank you for reporting it. We will fix it in future versions and will let you know when it will become available.


We have an issue logged for optimizing/reducing GPU usage when not needed and your suggestion is one of the solutions we will try to implement. I cannot say when it will become available but we will inform you when there is some development.

Best regards,
Alexander

Thank you very much for your reply
Vantage is now an important software for my expression design. Its sampling accuracy and speed are amazing
Thank you very much for the work of the development team

[q976431]

Hi q976431,


No, non-Latin characters should work both in 1 and 2 and this is an overlook on our side. Thank you for reporting it. We will fix it in future versions and will let you know when it will become available.


We have an issue logged for optimizing/reducing GPU usage when not needed and your suggestion is one of the solutions we will try to implement. I cannot say when it will become available but we will inform you when there is some development.

Best regards,
Alexander

Hi, about（In addition, I found a problem when I use 1 output sequence, if the save path contains Japanese, Korean, Chinese and other characters Then my image saving will fail When 2 is used, it is not affected by this Is this normal?)

Is there any progress in this matter? It makes me have to create folders with characters that are not understood by others.

[Alexander.Atanasov]

Hi q976431,

No, nothing for this issue has been developed yet. Will inform you when there is something in the works.

Best regards,
Alexander

[q976431]

All lights are sampled when the light tree is enabled, but not each frame, so you get a noisier image.
If you disable "clamp sec. rays", the result will be entirely correct with the light tree.

In fact, sampling ALL lights without the light tree might be incorrect, since not enough memory will be available for all the shadow rays.
You should always have the light tree enabled for scenes with many lights.

Maybe you can send us the scene with screen-shots explaining which lights don't seem to be rendered ?



I put the limit at 8, because more light tree samples further slow down the rendering and you probably won't see a significant difference in the result.
Also, more light tree sample require additional GPU memory (for storing all the generated shadow rays).

Greetings,
Vladimir Nedev

Hello, I still want to consult about light sampling. I may not have described it clearly before. If necessary, I can provide relevant scenes. I will try to describe:
There are a lot of lights in my scene. Follow your previous suggestion to "clamp sec. rays" You can get accurate lights by turning rays off and keeping the light tree open.
But my actual test is that the light is not very accurate. On the contrary, when the light tree is turned off, the light can be loaded accurately. But FPS will be much lower.
After the light tree is turned on, it will gradually sample the light, but there seems to be an upper limit, and the sampling is not completed at one time like turning off the light tree.

[q976431]

Sorry, I don't understand what the issue is by looking at these screen-shots.
We need a scene to investigate.

Greetings,
Vladimir Nedev

[vladimir.nedev]

If necessary, I can provide relevant scenes.

Yes, please, send us the scene.

Greetings,
Vladimir Nedev