depth of field affect reflections ...

[stachelzelle]

hello there ...

well, i have a problem with the DOF (depth of field) in vray and reflective objects/materials. if i set the camera focus to an object with an reflective material like chrom and use the vray DOF then the reflections on the focalized object will blurred although the object itself is sharp. in my opinion that isn't correct, but i can't find a solution to change this and get sharp reflections in focus with use of DOF.

if the object is in focus and sharp, then the reflections from the environment, that are shown on the focalized object must be also sharp and not blurry ?! it seems that the DOF also work in reflections but that isn't correct ...

anyone know a solution to solve this problem ?

[vlado]

The dof effect produced by V-Ray is correct; keep in mind that the shape of the reflective object plays a role and it can also act as a lens, focusing or defocusing the rays (like for example in a telescope with a reflective mirror).

Best regards,
Vlado

[rivoli]

as vlado says vray's depth of field is correct, you also have to consider that the focal point of the reflecting object it's not the same as the surrounding, reflected, ones. so in case of a mirror, for example, you can either focus on the actual mirror and have what's reflected blurred, or the other way round.

something like this:

http://flickr.com/photos/newbiemind/486022683/

[dlparisi]

If you do your DOF as a post effect it will behave the way you want since the Z channel has no info on the reflected surfaces.

[Da_elf]

it is indeed the correct physical property if you try taking a photo of a mirror with a tiny dot onit and focus on the dot the rest of the reflection will be out of focus. can you show us a picture of what your image looks like?

[matt]

stachelzelle >
i would suggest you to try a simple test, take a mirror, look at the surface from a distance around 10cm or 15cm, then you will see if you focus on the surface itself (more easy if there is a mark on it or something else) that the reflected envirronement is blured...

[Da_elf]

stachelzelle >
i would suggest you to try a simple test, take a mirror, look at the surface from a distance around 10cm or 15cm, then you will see if you focus on the surface itself (more easy if there is a mark on it or something else) that the reflected envirronement is blured...

ist that what i just said? hehe. id still like to see an image of his results though

[matt]

ist that what i just said? hehe. id still like to see an image of his results though

yes almost

that was just to let stachelzelle know he doesnt need a camera to do the test too...and see that blured reflection are physically right in this situation.