What's the crack??!! (VRay sun intensity multiplier)

[andrew.forbes]

What's the crack with the VRay sun intensity multiplier?

 

To get it anywhere near so that it doesn't look like a nuclear warhead has gone off I have to set it to 0.001 and the default is 1.0! 0.002 is acceptable but 0.003 is not and you can't have anywhere in between.

 

Is it something to do with units? Everything is set to mm.

 

Sorry if this has been covered before, I had a quick check but couldn't find anything.

 

It just seems weird that the default would be so high and the usable setting so low.

[Koper]

it goes hand in hand with the physical camera which must be used as a real slr camera, which in turn i think makes it much more realistic.

 

if you use a normal camera then yeah, you have to adapt. you can also use the 'exposure control' for the normal cam. just press '8 and you'll get the environments window.

 

 

the vray san/sky and physical camera is brilliant and if you know how it works then you'll love it

[andrew.forbes]

I see!

 

I shall give it a try but not having any real photography experience a may find it a little difficult what with all the settings.

 

Do you know of any tutorials dealing with the physical camera?

 

Thanks for your help.

[olli96]

there are quite a few examples in the manual and make sure you search the chaosgroup forum, there are a couple of threads about the Sun/Sky with videos and sample files.

 

Olli

[andrew.forbes]

Thanks for your help guys.

 

I've played around with a few settings and I can see the advantage of using the physical camera already. Been playing with the shutter speed, film speed and intensity multiplier of the sun. I am still using an incredibly low multiplier though as you can see I'm still on 0.002. Any suggestions would be great.

 

I'm about to start trawling through the chaosgroup forum now. You mention that I should look in the manual, I didn't get a manual with VRay as it was a download, is this another chaosgroup online thing?

[olli96]

Its Online: http://www.spot3d.com/vray/help/150R1/

[andrew.forbes]

thanks.....

[sonofalion]

Andrew, this is from my notes.

f-number (f-stop): opens up the camera aperture. Small makes brighter. Also determines the amount of the DOF effect

shutter speed: determines exposure time. Longer exposure (=small shutter speed) meand brighter image and vice versa. Also affects motion blur.

film speed (ISO): sensitivity of image. High ISO means bright image (less light is needed - good for night shots)

vertical shift: performs camera perspective correction (use "Guess vertical shift")

white balance: compensates for sunlight coloring. For daylight scenes, it should be set to "peach" (20,55,245)

 

So leave the default setting for the sun and play with the camera settings, starting with the ISO setting. Don't be afraid to set these too high or low. Good luck. If I have any errors, guys, please let me know.

 

Paris

[Ray]

This could help as well:

http://www.robert-barrett.com/photo/exposure_calculator.html