vray linear workflow and hdri

[foxwj2006]

Does anyone know how to use hdri with vray using linear workflow.

 

because the sun multiplier for the vray sun is set on such large intensities and using the vray camera to utilize its f stops and iso ranges etc. this works fantastically.

 

though when using hdri in my scenes they seem to be so low they do nothing . any tips people.

thanks heaps.

[Stephen Thomas]

2nd that, the multipliers you have to use with HDRIs when using the physical camera just seem so arbitrary. Though I think you're confusing terms a little, as using the vray physical camera and daylight system have nothing in themselves to do with linear workflow.

[moodo]

do you use the hdri together with the vray sun and cam? in any case the multiplier for the hdri is around 150 or so in conjunction with a vray cam.

[BrianKitts]

the multipliers you have to use with HDRIs when using the physical camera just seem so arbitrary......

 

actually I would rephrase that to say that a HDRI in arbitrary in themselves regardless of if you are using a physical camera. This is because your lighting is based on the data contained in the HDR and the amount light intensity in the file. Different HDRs will all contain different light levels so in a way it is arbitrary. Setting your intensity and the multiplier for the HDR are all based on the mood you are trying to set for your render, so there is no magic setting of course.

 

If you are using an HDR in conjunction with the vray sun, keep in mind that the sun is 30-40 times stronger than a typical light and your physical camera is going to be adjusting it's exposure for this intensity. So if you are using an HDR instead of the vray sky in your environment then you are going to need to crank up its intensity to compensate for the exposure adjustment your camera is adding based on the sun's intensity.

 

as using the vray physical camera and daylight system have nothing in themselves to do with linear workflow.

Actually they do relate because to get a proper exposure using the vray physical elements you need to be using LWF. Otherwise the sky is too dark, you could overcompensate by using higher light values.... but to use it properly you do need LWF. What doesn't really relate is you don't need to be using LWF to use an HDR. Although IMO LWF isn't a choice it's just the way things should be so I never do a scene any more without it regardless of lighting configuration,

Edited June 29, 2008 by BrianKitts

[foxwj2006]

using linear workflow the over exposure issue and compensation for dark spots by increasing light intensities is solved. the gamma is set at 2.2 and using vray sky and sun, images are perfectly balanced and massively easy to work with. though it seems most amusing that in order so represent hdri within a scene you have to go and jack up the values massively to be in line with the sun and sky settings...

is there another way of doing things rather than having to just massively increase the hdri intensity.. i dont know..