using cross cube format HDR

[Dave Buckley]

I have a HDR image but it is in a cross cube format with a .exr extension

 

How would i apply this in VRay, what option do i check in the VRay HDRI settings?

 

i.e. angular,screen etc

 

also whilst i'm on the subject, why do you guys use specific formats? do angular maps have advantages over cross cube format etc? why would one use HDR over EXR

Edited May 11, 2009 by Dave Buckley

[shaneis]

Ahh, the vertical cross format. You can create that format from a light probe using HDRShop. There's a fair chance you could convert it back to a probe for use as an angular map in VRay.

 

http://projects.ict.usc.edu/graphics/HDRShop/

[Dave Buckley]

i'm guessing i want it as a HDR too rather than EXR?

 

It seems to have worked pretty well just using the Cubic Environment option in the VRay HDRI settings

[Stephen Thomas]

Yes, the cubic option in the VrayHDRI map is the one to use for Vertical Cross format. The only format you want to avoid is the Horizontal Cross Format as Vray doesn't accept it.

 

As for formats and their differences I always tend to use the Latitude/Longitude format as I find it easier to see what's going on at a glance and also I personally think it gives you better quality and less distortion than the other formats, though others may disagree.

 

Also if you're using the VrayHDRI map then it will only accept HDR files. You can use EXRs but then I assume you would have to use the standard bitmap loader and set the white point, change the output based on the log value etc. etc. which is a huge hassle. Much easier to go with the Vray loader.