Question about mesh emitter lights

[DavidT]

I have started working on this scene by placing simple unfinished objects in it for blocking and testing some lighting for it. The first image shows two lights on a cylinder (using a simple plane for each emitter). The only diffence in the second image is that a large plane above the scene has it's material changed to have emission with a light blue color. Both images are rendered for 4096 samples.

You will notice the orange lights on the cylinder aren't as smooth now that I have added the one extra light. In my other scenes I haven't seen this occur when I use multiple lights. I have tried tweaking various settings to see if I could resolve this without any luck. Even rendering to 8000 samples doesn't improve it anywhere near what it was like in the first image.

Does anyone have any tips or suggestions to fix this?

It seems like I would have to let it render for at least 20000 samples (5x as original) to get it close to the first image (considering how 8000 samples looked).

[Daniel]

I had the same problem when trying to render a scene with 3 cars in it, all with their headlights on. The light reflecting on the ground was extremely rough and noisy, and even after 16000 samples it wasn't smooth. This is what it looked like (I did not make the car, by the way):

[DavidT]

Here is a cropped image of just the orange lights after 20000 samples, still no where close to the original image without the upper light.

[MaTtY631990]

I think because you introduced more light from a larger area it may have pushed the sample range up, meaning to say you need many more samples like you stated to get the same result. When all these bugs are finally fixed, we will all be glad.

[Monex]

This will be improved in v5, try looking under emitters in this post http://refractivesoftware.com/forum/vie ... 68&start=0

[DavidT]

Thanks for the replies. I had read that v5 post before, but totally forgot about the emitter improvement for nearby objects. Thanks for the info. I will just continue creating the models for the scene and test out the lighting when v5 becomes available.

[DavidT]

I just tested 2.3 v5 on this scene and it is a huge improvement. Here are the same lights in v5 at 2300 samples.

[Chris]

Yeah it looks much better now

[Daniel]

The public has spoken! It works! Congratulations to Refractive on another great update!
When the x32 version of v5 comes out on Monday I'll post the results of that car scene.