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Reflection / Refraction with Depth of Field
show user profile  cartwright_mj
Please have a look at the 2 images. Depth of field is applied in the second image. The target for the focus is on the droplet so I would expect the background to blur, the droplet to be in focus but also the reflected image to stay in focus, this is the plan. However, the image in the droplet has blur, although not as much as the background. I have used Arch+Design Glass (Physical). How can I get the image in the droplet to be sharp?? PS not an option as this will be animated. I want the focal point to change so the background comes sharp as the droplet blurs.
Thank you
read 338 times
1/16/2015 2:00:42 PM (last edit: 1/16/2015 2:00:42 PM)
show user profile  BishBashRoss
You falsely assume the reflection in the object would be sharp, when in reality it wouldn't. The solution is to use a Z depth render element, then in after effects animate and apply the DOF.

Hope that helps.

read 329 times
1/16/2015 2:23:37 PM (last edit: 1/16/2015 2:23:37 PM)
show user profile  cartwright_mj
I can do it with a DSLR camera in reality using a wide aperture, long focal length. I'm pretty sure it happens in reality. Thank you for answering, I will look into Z depth
read 327 times
1/16/2015 2:29:04 PM (last edit: 1/16/2015 2:29:04 PM)
show user profile  BishBashRoss
Actually, yeah. It is a bit confusing now I think about it.

If you were to shoot a picture of yourself in a mirror you'd need to focus the camera through the mirror to get a sharp image of yourself. If you focus on the mirror the image of you will be soft.

However when shooting a sphere this effect does seem to be mitigated to some degree. I'm guessing that the shape of the sphere compressing the image is coming into play a bit, and perhaps the fact that the sphere is not perfectly smooth.

Perhaps somebody here understands this better?

Or perhaps I'm remembering incorrectly. Sadly my sphere isn't here so I can't test it.

read 322 times
1/16/2015 2:40:32 PM (last edit: 1/16/2015 2:41:43 PM)
show user profile  ScotlandDave
Jeez, bit of a brainteaser this one, interesting problem..

[edit] If i understand correctly, i`d prob do what Ross suggests and do it in post..

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read 309 times
1/16/2015 3:10:06 PM (last edit: 1/16/2015 3:12:52 PM)
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