why doesn't it blur in the background?

Toobis

Am trying to do a blur effect behind Lara in the image in Iray where the fire is blurred and I think I have done it right in the image but apparently not. First picture is how I set up the camera and the second picture is how it came out where its not blurred in the background. What am I doing wrong pls.

srinity

I think you are using to large a Depth of Field.  Try using something in the 15-22 range, and the background should blur more. 

If you really really want a blurred background, step up to a 200mm focal length, push the camera further away (to get the same composition), and decrease the fstop to 10 or under.  

Chezjuan

I've found that the two panes indicating the "in-focus" portion can be rather close together, and that the subject can cross both the front and back plane and still be in focus. Getting the right amount of blur is also a case of trial and error. If your system can do Iray in the Aux viewport without slowing to a crawl, it can be very helpful to turn it on while you are setting DOF and tone mapping settings.

MarcCCTx

Just a note IRay depth of field is larger than 3Delight. You have to bring the panes closer to get the same effect in Iray, than you would expect if you were working in the other.

nicstt

Are you using a camera?

Adding a camera to the scene, does NOT mean it is being used; it is possible to have many cameras present.

Edit:

For example, the image you post shows the "perspective view", which isn't a camera. You can select (amongst others) a camera, or indeed a light instead to 'look through'.

Fishtales

@nicstt

If you look on the right lower pane he has the camera selected and is setting up the DOF, the Perspective view is the view of the camera and DOF panes, the render is through that camera.

nicstt

But is the selected viewport looking through the correct camera?

The auxilary viewport is a background tab, so we have no idea what that is set to; hence my question: about using a camera. Presuming it is selected is an easy way of missing the obvious; we all do it, well I hope we all do it as I certainly do.

Selecting one as shown isn't enough, sure he/she will set up DOF, but if the camera isn't selected in either the main or auxilary viewport, and the viewport selected with the desired camera also selected, also needs to be done.

Soto

The background in the second image IS blurred, just not as much as you want. As mentioned above, you have to put the DOF planes much, much closer in Iray.

Try a space the size of Lara´s leg and adjust from there.

L'Adair

@Toobis, Have you seen my post on using DOF? It explains all the settings used for DOF, includes a lot of images for clarity, and may help you achieve the look you want. Here's the link: How To Get A Blurred Background In Daz Studio Using The DOF Camera Options.