How do I calculate the lens shift ?

wizzleteet · Post by **wizzleteet** » Mon Jul 21, 2008 11:43 pm

Hi,

I noticed the new len shift option,

however, it does not seem to correllate with blenders lens shift.

How does it work, exactly ?

kind regards,

wzzl

BbB · Post by **BbB** » Tue Jul 22, 2008 12:16 am

No, it doesn't correlate (yet). Trial-and-error is the answer, basically.

FakeShamus · Post by **FakeShamus** » Tue Jul 22, 2008 12:16 am

I believe blender's lens shift is defined as a percentage of the camera view. indigo's shift is in real units - referring to the size of the film you've selected.

so, for example, if you set your film width to 35mm and you shift the blender camera 0.5 to the right, your indigo camera shift would be 50%, or 17.5 mm. if you are doing an up-shift you need to calculate how tall your film is (according to the proportions of your image you want to render) and calculate the blender shift percentage of that.

wizzleteet · Post by **wizzleteet** » Tue Jul 22, 2008 12:45 am

That sounds about right:

Indigo is set to 36mm film, blender's lens shift is .13.

Indigo's lens shift is: .0036 (m) x 0.13 = 0.00468

check !

Should be easy to implement in blendigo...

palawat · Post by **palawat** » Tue Jul 22, 2008 4:04 pm

FakeShamus
Thank you for sharing. This is really helpful information

FakeShamus · Post by **FakeShamus** » Wed Jul 23, 2008 1:32 am

great!
it would definitely be nice if the calculations could be built right into blendigo.

BbB · Post by **BbB** » Wed Jul 23, 2008 1:41 am

So how tall is a 36mm film?

SmartDen · Post by **SmartDen** » Wed Jul 23, 2008 2:32 am

24 × 36 mm

BbB · Post by **BbB** » Wed Jul 23, 2008 2:36 am

cheers smarty. Already hard at work on a 1.1.6 Blendigo?

SmartDen · Post by **SmartDen** » Wed Jul 23, 2008 2:39 am

nope...
i had not enough tester for 1.1.5 and i have much fewer for 1.1.6 Why should i rack me for nothing?! and btw nk-materials don't work in 1.1.6

BbB · Post by **BbB** » Wed Jul 23, 2008 2:53 am

So it's bye-bye Indigo for all Blender users

?

Woodie · Post by **Woodie** » Wed Jul 23, 2008 3:08 am

Smart I think that you probably see it incorrectly. It's not that because people do not report errors they don't use it. I use it all the time but I just got no errors. I got some reported them and you fixed it. We all do appreciate your hard work on this awesome piece of work you do. Please don't stop.

BbB · Post by **BbB** » Wed Jul 23, 2008 3:09 am

Can't you guys see this hard-working man needs a holiday?

FakeShamus · Post by **FakeShamus** » Wed Jul 23, 2008 3:36 am

@BbB - the height of your film depends on your image proportions. if your width is 36mm and you are rendering your image at 600x800, your film height would be 27mm. if you render a square image, it would be 36 mm, etc...

I also very much appreciate all your hard work, SmartDen. and I have to echo Woodie in that I use the 1.1.5 exporter all the time, and just never ran into any problems so far. awesome work! and holidays for everyone! I know I could use one too.

BbB · Post by **BbB** » Wed Jul 23, 2008 4:19 am

Thanks Shamus!

How do I calculate the lens shift ?

How do I calculate the lens shift ?

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