Dead pixels appearing when rendering a specific scene

SARMAT

Hello,
I’ve run into an issue: dead pixels appear during rendering, but only in one particular scene. It does not happen in any other scene.

I thought it might be related to the large number of light sources in this scene. However, I also have other scenes with many lights, and they don’t show this problem. Moreover, I tested removing all but one light source, and the issue still persisted.

I’m using the following products:

• Daz Studio 4.22 Pro

• Genesis 8 Dev for example

• https://www.daz3d.com/aquarium-bar

Here are my render settings:

I’d appreciate any help or suggestions on what might be causing this.

 

crosswind

They're not "dead pixels" but either fireflies yielded by multiple emissive lights in this bar or reflected metalicity. Check this thread which related to your issue with this bar product:

https://www.daz3d.com/forums/discussion/696956/white-dots

You can try tweak emissive light sources in this bar or increase the value a bit in Nominal Luminance in Render Settings to see if the fireflies will be reduced when rendering.

crosswind

Ah... I just realized that the issue in above old link also came from you. 

Did you try anything with the scene by adopting the folks' suggestions in that thread?

IceCrMn

I have this set and it has many reflective surfaces and lights so the lighting is really "dirty".

Your post denoiser is set to turn on at iteration 3500.

Does the scene start clearing up after that or no?

I'm assuming it's taking a long time to get to 3500 iterations on the render, if it even goes that high, so the post denoiser appears to not start at all.

Try setting it to something like 10 or 20 so it starts sooner and see if that helps.

If it does then you can set the start iteration to something higher, but 3500 still might be too much.

I leave mine at the defaults and just turn on the Post Denoiser set to 20 and it seems to work for me.

I leave the "Burn Highlights"(set to 1) and "Crush Blacks"(set to 0) at the defaults because this is where you get your good lighting depth from.

 

This is what mine looks like with 456 iterations.

Padone

You can try to enable "render quality" and "guided sampling", that should deal better with complex light settings, especially in dark indoor scenes as that one. Also the denoiser may not kick in if the render converges before the start iteration, so better lower the value.

crosswind

I played with this bar scene for a while and I could reproduce the issue you have, by using the same render settings as you showed,  in screenshot 1.

Then the culprit has been found... which comes from a glass surface within an Aquarium_Back_Frame. You can, in Surface pane,: 1) either hide the glass surface by set its Cutout Opacity to zero; 2) or set the value in Abbe to 0, which was 55 set by the vendor, check screenshot 2.

I don't think there's any problem with your render settings. After tweaking the settings by using the above option 2), I got the render as screenshot 3.

Pls give it a try ~ see if it can fix the issue on your side.

SARMAT

crosswind said:

I played with this bar scene for a while and I could reproduce the issue you have, by using the same render settings as you showed,  in screenshot 1.

Then the culprit has been found... which comes from a glass surface within an Aquarium_Back_Frame. You can, in Surface pane,: 1) either hide the glass surface by set its Cutout Opacity to zero; 2) or set the value in Abbe to 0, which was 55 set by the vendor, check screenshot 2.

I don't think there's any problem with your render settings. After tweaking the settings by using the above option 2), I got the render as screenshot 3.

Pls give it a try ~ see if it can fix the issue on your side.

Thank you all for your answers. I tried deleting “Aquarium_Back_Frame” completely. However, the white dots became fewer, but they did not disappear. I tried turning on “rendering quality”—it didn't change anything.

To be honest, I'm confused.

crosswind

I don't know why.... It 100% works on my side.

I should've attached the scene file.... but this vendor didn't save any figure assets of this bar, so I coudn't share the scene file.

What is DS version that you're using now ? And what is your Nvidia driver version ?

SARMAT

crosswind said:

I don't know why.... It 100% works on my side.

I should've attached the scene file.... but this vendor didn't save any figure assets of this bar, so I coudn't share the scene file.

What is DS version that you're using now ? And what is your Nvidia driver version ?

Nvidia driver - 581.29

Daz Studio 4.22 Pro

I attached the scene file so you can take a look.

crosswind

SARMAT said:

crosswind said:

I don't know why.... It 100% works on my side.

I should've attached the scene file.... but this vendor didn't save any figure assets of this bar, so I coudn't share the scene file.

What is DS version that you're using now ? And what is your Nvidia driver version ?

Nvidia driver - 581.29

Daz Studio 4.22 Pro

I attached the scene file so you can take a look.

https://drive.google.com/file/d/1loC3SY19cZSWAWMa7YE3BRw2vOg-BLni/view?usp=sharing

You shouldn't share the scene file either because everybody can get this product... Fortunately, you shared nothing in the above link.