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MR DoF Question
show user profile  click here
when using the cameras multi pass effect DoF for mental ray how do reduce the amount of blurring in the background. it changes from clear to blur to quickly. how do i change that?

----------------------------------------
February 21st 2006. My first day using max.
Everyone likes it sugarcoated, but that doesn't make it the best way to take it.



Join my folding group.

read 837 times
4/8/2008 7:18:28 PM (last edit: 4/8/2008 7:18:28 PM)
show user profile  Vaiestro
Theoretically, the amount of blurring is determined by the aperture of the camera, the lower the aperture, the wider open the iris, and the shallower the DOF. In MR the aperture value is controlled by changing the "Sample Radius" parameter under the DOF Parameters rollout under the camera object. Hope it helps :)

Matts
read 795 times
4/9/2008 2:24:06 AM (last edit: 4/9/2008 2:24:06 AM)
show user profile  click here
i can't seem to find where the "sample radius" thing is

by following your directions all i see is f-stop

----------------------------------------
February 21st 2006. My first day using max.
Everyone likes it sugarcoated, but that doesn't make it the best way to take it.



Join my folding group.

read 767 times
4/10/2008 2:25:19 PM (last edit: 4/10/2008 2:26:25 PM)
show user profile  Nik Clark
Smaller numbers equal more blur in the Fstop. Don't use multi-pass for MR.




read 753 times
4/10/2008 3:08:46 PM (last edit: 4/10/2008 3:08:46 PM)
show user profile  click here
nik what dof would you recommend then?

----------------------------------------
February 21st 2006. My first day using max.
Everyone likes it sugarcoated, but that doesn't make it the best way to take it.



Join my folding group.

read 746 times
4/10/2008 3:48:07 PM (last edit: 4/10/2008 3:48:07 PM)
show user profile  3Ddeath
If your using the multi-pass Effect DOF option in your camera settings then its quite simple as you have all the options right there and you can preview it in your viewport.

The MR one is ass, only works in perspective views, its way quicker then the multipass but what a load of crap.


Portfolio Site
read 733 times
4/10/2008 5:42:44 PM (last edit: 4/10/2008 5:42:44 PM)
show user profile  JeffPatton
There are several options for DOF in mental ray. There's the mr camera DOF, the perspective DOF that 3Ddeath mentioned... and then there are lens shaders that can create DOF. If you're using 3dsmax 2008 or higher, theres a hidden dof/bokeh lens shader that works great.

Me personally, I prefer to render out a z-depth pass and add DOF in post. While it may not be as accurate as true 3d DOF, often it works fine and it sure beats having to wait on a DOF render...especially if after the render is complete you realize that you'd like to change the DOF a bit.

Jeff
http://jeffpatton.cgsociety.org/gallery/
http://mrmaterials.com/

read 695 times
4/11/2008 6:59:39 AM (last edit: 4/11/2008 6:59:39 AM)
show user profile  soontekk
here here jeff

melting ur brainz!
/ FOS4 / FO2 / Blurb / Twitter / Facebook / Vimeo /


read 664 times
4/11/2008 11:15:42 AM (last edit: 4/11/2008 11:15:42 AM)
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