Poor lighting conditions

[glorybound]

I have a project with a series of interiors. These interiors have a small window and with no textures or much detail, I am getting 3 hours + render times. What's the best way to address this? This is a common scenario. The only thing that really works is a VRay plane in the window opening.

https://files.acrobat.com/a/preview/...4-829b42316b5d

[matanov]

Put the VRaySky texture in a Dome light and turn on the Adaptive Dome light.

[notamondayfan]

It's very tricky, but you just need to find a lighting solution that works. Pumping light through a tiny window often doesn't work.

Instead look at how else you can use light to make for an interesting shot...

https://www.pinterest.co.uk/pin/304274518573647275/
https://www.pinterest.co.uk/pin/ATEr...rolNEe2p1TEUE/

[hoppergrass]

you dont always have to rely on Sun and sky or a dome light to light your interiors and use what ever lights to get the results you desire. After all you are creating a pretty picture, not a lighting analysis

[werticus]

What's wrong with the vray plane in the window trick? Put it inside the glass for even faster rendering.

[glorybound]

I think there was something inherently wrong with the scene. I think I’ll reset and try again. I’ll be working on these next week.

[glorybound]

Strange behavior. I followed something someone sent and the render times fell back into what should be expected. "Add a dome light with default settings then ENABLE it's Adaptive Dome, then stick the VRaySky from the Environment into the dome's texture". To do this I deleted my V-Ray Dome and pulled a V-Ray Sun. I then dropped in a dome light and dragged/dropped the environment VRay Sky into it, enabling Adaptive Dome. I don' t know if it is the order of things, or dragging/dropping the env into the dome or what, but the render speed right up. I was adding the V-Ray Sky straight from the dome light and I would clear the environment slot.

[m_hinks]

Interesting you mention the VraySky in the Dome light, and render times going up not down. I had the same issue and contacted vlado, but I have not had time to send him a scene with the issue in. It sounds like you had the same issue, but by recreating it in a different order you fixed it?

I really need to to prepare the scene for Vlado, maybe today!

[matanov]

Maybe I wasn't very clear when I wrote this in the first place (the thing that "something someone sent" = 2nd post in this thread).

Putting VRaySun in a scene creates VRaySky in the Env slot. In your scene, the sun doesn't lit directly the room and you are relying only on the GI from the VRaySky in the Env slot (only GI rays) which is obviously not enough for good sampling an interior. This is why you MOVE the VRaySky tex from the Env slot into a Dome VRayLight and turn the ADL on, so the light coming from the sky will not only be direct, but it will be sampled in the best possible way because of the smart ADL.

[m_hinks]

I'm just testing again now with a scene I saw an increase in render times doing this method, so I'll see what happens. I am doing the exact method you describe.

Edit - Sent Vlado a couple of test scenes with both setups. In this latest test the render time has dropped around 10% with the same visible noise which is good. Since the last test where the dome was slower, we're using the latest stable Vray nightly build. Main thing that's strange is the differences in the GI/lighting/Ref/spec passes.