Re: [Scripting] camera parameters

[Sam Cuttriss <cuttriss(at)whiskytree.com>]

ah, sorry our email was down.
looks like you are on top of things though.

stephen, do you have any idea why we are getting these problems in the 
first place?
is it something that is likely to be resolved any time soon?


_sam


Byron Nash wrote:
> I got it now. I didn't know about the degrees to radians conversion.
>
> Here is the correct equation in Jscript to determine the FOV from the 
> focal length.
>
> XSIMath.RadiansToDegrees(Math.atan( ( Filmback_Width / 2 ) / 
> Focal_Length ) * 2 )
>
>
> On Wed, Apr 30, 2008 at 10:31 AM, Byron Nash <byronnash(at)gmail.com 
> <mailto:byronnash(at)gmail.com>> wrote:
>
>     Yeah, I just figured that out. Now I'm getting results but
>     Math.atan in JScript doesn't seem to give a proper result. I get a
>     different value than when I run the numbers on a calculator.
>
>     Shouldn't this return the correct FOV? Those are my hard numbers
>     that I used to test the equation.
>
>     LogMessage( Math.atan( ( 8.8 / 2 ) / 14 ) * 2 )
>
>
>     On Wed, Apr 30, 2008 at 10:19 AM, Stephen Blair
>     <Stephen_Blair(at)softimage.com <mailto:Stephen_Blair(at)softimage.com>>
>     wrote:
>
>         shouldn't you be using the same units, instead of mm here and
>         in there?
>
>         ------------------------------------------------------------------------
>         *From:* owner-xsi(at)Softimage.COM
>         [mailto:owner-xsi(at)Softimage.COM
>         <mailto:owner-xsi(at)Softimage.COM>] *On Behalf Of *Byron Nash
>         *Sent:* Wed 30 April 2008 9:39 AM
>
>         *To:* XSI(at)Softimage.COM
>         *Subject:* Re: [Scripting] camera parameters
>
>         I did some searching on the list and found this equation for
>         determining the FOV from the filmback and aperature.
>
>         (aTan ((filmback width/2) / focal length)) * 2 = fov (horizontal)
>
>         I'm doing something wrong because my results aren't close to
>         what they should be.
>
>         In my case, the Focal Length in XSI is 14mm and the Film
>         Aperture is 0.3465 x 0.1949in.
>
>         (aTan( ( 0.3465 / 2 ) / 14 ) ) * 2 = 1.417 ??
>
>         What am I missing other than lots more math in school?
>
>         On Tue, Apr 29, 2008 at 9:18 PM, Byron Nash
>         <byronnash(at)gmail.com <mailto:byronnash(at)gmail.com>> wrote:
>
>             No Sam, that's not what I'm up to but your problem is what
>             I'm looking for. That's not very encouraging that you have
>             to find a work around. I'm doing some work on the
>             XSI-to-AE script during downtime. The script doesn't work
>             when the projection plane is animated. I'm trying to build
>             in all the error functionality that wasn't there to start
>             with. Do you still have any of that code you wrote laying
>             around? I have no idea how the math works to generate
>             those numbers so I'm pretty much fumbling around in the dark.
>
>
>             On Tue, Apr 29, 2008 at 5:34 PM, Sam Cuttriss
>             <cuttriss(at)whiskytree.com <mailto:cuttriss(at)whiskytree.com>>
>             wrote:
>
>                 let me guess, you are trying to render an animated
>                 camera X% oversized?
>
>                 i ran into the same thing recently and almost lost my
>                 mind at 3 in the morning.
>                 i think my email to the list was censored (probably
>                 for the best)
>
>                 it seens the proj plane is only calculated when the
>                 camera properties is open?
>                 after trying a list of simple options as long as my
>                 arm i ended up writing a scop that did all the trig
>                 and set the values.
>                 which was frustrating considering the value i wanted
>                 was laughing at me onscreen but unattainable.
>
>                 _sam
>
>
>                 Byron Nash wrote:
>
>                     Thanks Matt, that did the trick. Any idea why when
>                     I have an expression on the Projection Plane
>                     distance(linking it to another camera), that the
>                     FOV value doesn't change when I access it's value
>                     in scripting?
>
>                     On Tue, Apr 29, 2008 at 4:30 PM, Matt Lind
>                     <mlind(at)carbinestudios.com
>                     <mailto:mlind(at)carbinestudios.com>
>                     <mailto:mlind(at)carbinestudios.com
>                     <mailto:mlind(at)carbinestudios.com>>> wrote:
>
>                        try this instead:
>                            LogMessage( oCamera.Name );
>                        LogMessage( oCamera.Parameters( "projplane"
>                     ).value );
>                                    Matt
>                            
>                          
>                      ------------------------------------------------------------------------
>                            *From:* owner-xsi(at)Softimage.COM
>                            [mailto:owner-xsi(at)Softimage.COM
>                     <mailto:owner-xsi(at)Softimage.COM>
>                            <mailto:owner-xsi(at)Softimage.COM
>                     <mailto:owner-xsi(at)Softimage.COM>>] *On Behalf Of
>                     *Byron Nash
>                            *Sent:* Tuesday, April 29, 2008 1:18 PM
>                            *To:* xsi(at)Softimage.COM
>                            *Subject:* [Scripting] camera parameters
>
>                            I'm having trouble with the second line
>                     I've pasted below. The
>                            first line properly returns the name of the
>                     camera in the
>                            newCam variable. I can't figure out why it
>                     doesn't work in the
>                            second line even though I've tested it in
>                     another script.
>
>                            logmessage(newCam.name);                  
>                                logmessage(newCam.camera.projplane.value);
>
>                            What I'm trying to do is check whether the
>                     Projection Plane is
>                            turned on for this camera.
>
>                            Thanks.
>
>
>                            --        Byron Nash
>
>
>
>
>                     -- 
>                     Byron Nash
>
>
>                 ---
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>
>
>
>
>             -- 
>             Byron Nash 
>
>
>
>
>         -- 
>         Byron Nash
>
>
>
>
>     -- 
>     Byron Nash 
>
>
>
>
> --
> Byron Nash 

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