Lights not working, lighting changed, after saving everything + restarting scene

[terrordemon]

Hi. Using the most recent version of V-Ray, I had worked to get lighting right for an interior scene I was working with. I had configured it with a few lights, and when I was done setting it, saved the visopt file. I then rendered a few images and closed the file. When I next opened the file, 10 minutes later, to re-render a scene, the entire image came out white. When I changed the camera shutter speed to 500, from 20, I saw that the scene was being dramatically overexposed.

I guess my first question is, does anyone have any idea why this happened? I tried loading the visopt in the same scene, but same problem.

Secondly, and maybe importantly, I then reset the VRay options to default, and tried rendering it. The lighting conditions were better, but the lights in the scene that still remained would not put out any light. This makes me think that it may be a setting within the model, but does anyone have any idea why either of these are happening???????????????????????!!!!!!

Thank you.........

[artupato]

Re: Lights not working, lighting changed, after saving everything + restarting scene

When using a physical camera(under camera rollout in vray options), you should use vray sun and sky under Environment rollout>GI and Background.

setting the shutter speed 20 (depending on f-number and ISO) will make the image brighter.
for interior scenes you can use 80 shutter speed, f-number 6, ISO 200
(this also depends on your lighting in the room)

If you have a night interior scene (which means the interior lights are lit as opposed to a day interior scene where a window or any other opening will be your source of light) then you can use the default camera of vray (can be found in the camera rollout in vray options)

the reset button on vray options will set to its default setting with the physical camera on plus GI and background with sun and sky.