Crazy edges with depth of field!

[Noely71]

Hi,

 

Every edge that is against the background of this very basic shot have gone fuzzy/over exposed. i have put depth of field on, and it is against an IES skylight.

 

What can cause/fix this?

 

Neil

[Darkling]

Hi Noely71

 

It looks like you are rendering with scanline and compositing the bg in later. IF that is the case, then turning off anti-aliasing against background might help.

 

If you are using something like vRay or MentalRay, then you need to output your image to a format that supports an alpha channel before you composite. The "aura" that you are seeing are aliased pixels with no transparency.

 

The simplest option at the end of the day is to just drop your sky image into your environment slot with screen mapping.

 

Hope that helps, but there wasnt really enough info to give more accurate help.

[Noely71]

Okay thanks,

 

More info would help! I am rendering in mental ray, the sky image has been dropped into the environmant slot.

 

I have put in a daylight system for sunlight, if i use the MR skylight however, then the sky image doesn't appear, but if i change it to the IES skylight, then the sky does appear, it works well this way, until i put depth of field onto the camera. Then it goes a bit crazy, like so.

 

Neil

 

3ds max 9

[Darkling]

Oh, that changes everything.

 

Enable "Process Background" in the exposure control settings, that should fix it up immediately. Though you have a strange setup and should probably work out a better way of using an image in the environment slot. Its going to be a nightmare with your exposure settings.