Hi guys,
I had this problem since a while now, but because I don’t use DOF very often, and I never have time to breath, I’m here today asking for help.
I work in scale, I know how DOF works in real life, but here in vray to start seeing something I have to put a value of 1.2 in the Fstop.
in general, with that value, depth of field should be very narrow and very blurry, but as you can see in my render test, that is something I should expect from higher values
If you switch the scene units to mm then you should get the correct result, as the Vray cam works with mm and doesn’t (though it would be nice) do an ‘auto-convert’
DOF also gets messed up if you somehow managed to scale your camera. In fact in this case there is what I would call a bug that displays the plane of focus in completely the wrong place.It’s not normally good to scale your camera. However, if you have a camera parented to a null and scale the null it will happen.
It is annoying to have to remember but that is the case. It does state that mm is necessary in the docs.
I don’t think that conversion is correct…maybe there is an equation but that is way more hassle than switching units I’d say.
Also it throws out all the other settings of course.
No f-ing way. Seriously? After all this time, this explains why I had to “hack” myself to a more or less correct DOF. Does this also apply to the PhysicalCamera of 3dsMax? So the standard F-stop of 8 is actually 80 when working in cm… This kind of should be fixed to work with all the scene units.
Interestingly, this 2013 post quoting Vlado specifically states that conversion is taken care of internally.
Maybe something changed over the years to invalidate this feature… https://forums.cgsociety.org/t/vray-…nits/1573235/3
The framing is very different between the switched units, for whatever reason.
I noticed the target distance changes from 451.779 to 45.178, which seems like a negligible amount though the visual difference appears far greater.
Yes, in fact even dividing f-stops isn’t a fix.
It could be due to the way the lens is modelled, or some other obscure reason.
I poked the devs and asked. I’ll feed you guys back as i’ll know more.
Hey guys, something is not right here, maybe I am wrong but…
I did a simple test, and working in cm and with an aperture of 8 the representation of the depth of field of the physical camera of Max is correct …
the target is placed at 100 cm from the camera, so the part in focus should be around 15.5 cm for a 35 mm lens, and it’s matching…
Same for the vray physical camera
I’ve never encountered this issue. System Units cms. VRayPhysicalCamera, film gate 36mm, 50mm lens, f8. focus at 2m gives dof of ~65cm (175 to 240cm). renders ok.
