Re: 4/3 crop box on a 16/9 cam ?

[guillaume laforge <guillaume.laforge.3d(at)gmail.com>]

Just move  up this old thread for Alan :-)

2005/5/18, Andre DeAngelis <andre.deangelis(at)ubisoft.com>:

Yeah what Frabrice is after (and what we use) is the same effect, only in pillar box mode..

 

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From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf Of ozu's mailbot
Sent: Tuesday, May 17, 2005 9:21 PM
To: XSI(at)Softimage.COM
Subject: Re: 4/3 crop box on a 16/9 cam ?

 

You can also use the DisplayCallback to draw a semi transparent OGL overlay on the window and do your own lettter-boxing.
Alain Laferiere posted something to that effect a little while ago. We are using something very similar in house to display
our 2.35 mask inside a 4:3 PAL render so we can quickly feed QT for editorials with the correct framing and aspect ratio.

I don't remember what the plugin wasd called but it is on XSINet. (I know, not very helpfull, am I)

oO

Andre DeAngelis wrote:

That's interesting Marc, thanks,

I will look into it and modify our script if indeed the custom camera

option is the culprit.

Andre

-----Original Message-----

From: 
owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf

Of Marc Bourbonnais

Sent: Tuesday, May 17, 2005 2:36 PM

To: XSI(at)Softimage.COM

Subject: Re: 4/3 crop box on a 16/9 cam ?

Ahhh, my kind of thread. FoV vs. lens.

The refresh issue is happening probably because

1) you are keying or controlling the lens value and the FoV values at

the

same time. Aperture will not change but FoV and lens will merrily jump

around.

2) your aperture settings are changed and your camera format is not

"Custom". XSI will mess up a modified camera if the format is kept as

one of

the standards after some refresh, for example after rendering or

previewing

a frame.

Since Andre is mentionning changing aperture, it is probably 2). Just

change

the camera format standard to "Custom"

Around here I hit people with sharp objects when they use anything but

the

lens value for camera controls. No refresh issues. It simplifies

everything

and as a bonus you're in synch with DOPs and camera reports; FoV doesn't

exist in real life. Aperture and lens do.

Fabrice:

The base magic formula for lens vs. FoV is

f = (0.5*Ap) / tan(0.5*FoV)

How to implement it with the setup you want to use would depend on how

you

want to control your camera. I suppose you want to keep the vertical and

crop right and left? Are your camera(s) zooming or is the FoV constant?

Maybe too simple, but have you thought of using a simple rotoscopy pic,

a

16:9 image with your 4:3 crop as a background image? Or as a camera

projection?

--

Marc Bourbonnais

3D TD

Hybride

(450)227-4245

----- Original Message -----

From: "kim aldis" 
<kim(at)aldis.org.uk>

To: 
<XSI(at)Softimage.COM>

Sent: Tuesday, May 17, 2005 1:41 PM

Subject: RE: 4/3 crop box on a 16/9 cam ?

I have a script already, Andre, but thanks anyway. You're right, it

does

cause a refresh issue. Mine will probably do the same then. No cycle

dependancies either. No idea.

-----Original Message-----

From: owner-xsi(at)Softimage.COM

[mailto:owner-xsi(at)Softimage.COM] On Behalf Of Andre DeAngelis

Sent: 17 May 2005 18:29

To: 
XSI(at)Softimage.COM

Subject: RE: 4/3 crop box on a 16/9 cam ?

Hi Kim,

This is a script we created to do most of this.  Pretty

simple, buit it does the trick.

The script sets our cam parameters based on aspect ration of

the film aperture.  You will want to make changes according

to your needs.  To apply it, select your camera and run the script.

The script also creates a PPG with lens presets.  We did this

because changing the lens size created a refresh problem as

opposed to changing the FOV.  Perhaps you could figure out

what is causing the refresh problem.

Andre

-----Original Message-----

From: 
owner-xsi(at)Softimage.COM

[
mailto:owner-xsi(at)Softimage.COM] On Behalf Of kim aldis

Sent: Tuesday, May 17, 2005 1:04 PM

To: XSI(at)Softimage.COM

Subject: RE: 4/3 crop box on a 16/9 cam ?

What I do is build a rig with a bone parented to the camera

and a rectangle on the bone, scales expressed so it fits in

the camera view  no matter where you slide the square on the

bone. I can post a rig if you want it in a hurry but I'm

thinking that the plugin I have to build it might make a good

Soup tool. What do you think, Maggie?

-----Original Message-----

From: owner-xsi(at)Softimage.COM

[mailto:owner-xsi(at)Softimage.COM] On Behalf Of Fabrice Altman

Sent: 17 May 2005 14:27

To: 
XSI(at)Softimage.COM

Subject: 4/3 crop box on a 16/9 cam ?

Hi List,

What's the best way to show a 4/3 semi-transparant "crop box"

in a 16/9 cam viewport and capture ?

Doing a post crop is not an option as I need a very fast solution.

Just showing the field guide is not enough.

Locking a grid in front of the camera is sort of what I need but

is

there a relationship between the cam FOV and the size of the grid

?

I've looked into Xgs_slate but the bitmap has to be

different size in

viewport and capture to work nicely, and the mask option

only seems to

work only horizontaly.

Thanks in advance,

F.

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