I wonder if this might be related to the color picker/knobs differences bug?
Concerning that bug:
> any knob that is
> using a color picker is rounding the results to 3 decimal places, or a funny
> rounded floating point which is still not correct. It's a surprisingly obvious
> bug - just use the picker in any knob and scrub. If you scrub an image, the
> picker returns only 3 decimal places,regardless of the true value that you
> will see in the viewer.
From the foundry:
I can confirm that this issue is logged as Bug 5819 and I have added your
comments to the bug. Sadly there is no work around for this as there appears
to be some integral changes that have been made.
Our workaround for our specific problem was to get the values via python and
sample coordinates instead of the color picker. It makes me wonder if the chan
file export is using the same rounded math as the picker? I think Nathan's
suggestion is unfortunately the solution. I hope foundry can give a priority
boost to that bug - it seems pretty old?
JRAB
On Feb 26, 2011, at 2:35 PM, Ean Carr wrote:
> Hey Deke, I thought that at fist, too, so I fired up the chan file in a text
> editor. Still the issue.
>
> Nathan, I think something like what you said is going on here. Some quick
> googling suggests that tcl uses double float precision internally so would
> this really be the root of the problem? I admit I don't fully understand the
> difference, anyway.
>
> On Monday I might fire up an old Nuke 5.x to see if it has the problem.
>
> Thanks for the replies, guys.
>
> -E
>
>
> On Fri, Feb 25, 2011 at 5:54 PM, Nathan Rusch <nathan_ru...@hotmail.com>
> wrote:
> The expression parser (which is being called by export_chan_file.tcl) seems
> to be operating in single-precision float. Easiest way around this that I can
> see is to roll your own in Python.
>
> -Nathan
>
>
> From: Ean Carr
> Sent: Friday, February 25, 2011 4:20 AM
> To: Ron Ganbar
> Cc: Nuke user discussion
> Subject: Re: [Nuke-users] Re: chan exporter rounding values?
>
> No, this is a chan file exported from Nuke (using the menu in the camera
> node's properties). So Nuke itself is doing the rounding.
>
> I just thought to have a look at export_chan_file.tcl (pasted below), which
> presumably contains the proc that actually does the work. However my tcl
> skills are almost non-existent. Can anyone comment on why the below might be
> rounding in this case?
>
> Thanks, -E
>
>
>
> # Copyright (c) 2007 The Foundry Visionmongers Ltd. All Rights Reserved.
>
> # Write the animation from the current Camera or Axis node to a .chan file
>
> proc export_chan_file {filename} {
> set start [animation_start]
> set increment [animation_increment]
> set end [animation_end]
>
> set not_camera ![exists this.vaperture]
>
> set f [open $filename w]
> for {set x $start} {$x<$end+1} {incr x} {
> set line $x\t
> append line [expression translate.x($x)]\t
> append line [expression translate.y($x)]\t
> append line [expression translate.z($x)]\t
> append line [expression rotate.x($x)]\t
> append line [expression rotate.y($x)]\t
> append line [expression rotate.z($x)]
> if $not_camera {
> puts $f $line
> } else {
> append line \t
> set va [expression vaperture($x)]
> set vao [expression focal($x)]
> append line [expr 2.0 * atan($va / (2.0 * $vao)) * 57.29577951]
> puts $f $line
> }
> }
> close $f
> }
>
>
> On Fri, Feb 25, 2011 at 11:52 AM, Ron Ganbar <ron...@gmail.com> wrote:
> Is this from Maya?
> Recently I had to copy and paste values from Nuke to Maya, and Maya kept
> rounding numbers, which I found very odd.
>
>
> Ron Ganbar
> email: ron...@gmail.com
> tel: +44 (0)7968 007 309 [UK]
> +972 (0)54 255 9765 [Israel]
> url: http://ronganbar.wordpress.com/
>
>
> On 25 February 2011 11:27, Ean Carr <eanc...@gmail.com> wrote:
> I should also mention that writing the camera to an FBX file doesn't show
> this problem when reading it back into Nuke.
>
> 6.1v1 linux
>
> -E
>
>
> On Fri, Feb 25, 2011 at 9:25 AM, Ean Carr <eanc...@gmail.com> wrote:
> Hi everyone,
>
> I have a camera and when I export a chan file and bring it back in, it's
> slightly off. Values are rounded anywhere from the nearest tenth to
> thousandth. Comparing the two cameras in the 3D viewer shows a very
> noticeable difference. I've been using the chan exporter for years and never
> saw this until now. Or maybe I've been missing this the whole time.
>
> The original camera is below and the chan file it exported is attached. You
> can see the rounding right off the bat: the first value on frame 1,
> translate.x:
>
> original camera: -7013.19873
> exported chan: -7013.2
>
> Anyone seeing similar behavior?
>
> Thanks,
> Ean
>
>
>
> set cut_paste_input [stack 0]
> version 6.1 v1
> push $cut_paste_input
> Camera2 {
> file_menu Axis/File
> snap_menu Axis/Snap
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> 0.9999998808 1 1 1 1 1 1 0.9999999404 0.9999999404 0.9999999404 1
> 0.9999999404 1 1 1 1 1 1 1 1 0.9999999404 1 1 1 1 0.9999999404 1 1
> 0.9999999404 1 1 0.9999999404 0.9999998808 0.9999999404 0.9999999404 1
> 0.9999999404 0.9999999404 1 1 0.9999999404 1 0.9999999404 1 1 1 1 1 1
> 0.9999999404 1 1 0.9999999404 0.9999998808 1 1 0.9999998808 0.9999999404 1 1
> 0.9999999404 1 1 0.9999999404 0.9999999404 1 0.9999999404 0.9999999404 1 1}
> {curve x1 1 0.9999998808 1 1 0.9999998808 1 1 1 1 0.9999999404 1 1 1 1
> 0.9999998808 0.9999999404 1 0.9999999404 1 0.9999998808 1 0.9999999404
> 0.9999999404 1 1 1 0.9999999404 0.9999999404 1 1.000000119 0.9999999404
> 0.9999998808 1 1 0.9999999404 0.9999999404 0.9999999404 1 1 1 1 1 1
> 0.9999998808 1 1 1 1 1 1 0.9999999404 1 1 0.9999999404 1 1 1 0.9999999404
> 0.9999999404 1 1 1 0.9999999404 1 1 0.9999999404 0.9999999404 1 1 1 1 1 1
> 0.9999999404 1 1 0.9999999404 1 0.9999999404 0.9999999404 1 0.9999998808
> 0.9999999404 1 1 1 1 0.9999999404 1 1 1 0.9999999404 1 0.9999998808
> 0.9999999404 1 1 0.9999999404 0.9999998808 0.9999999404 1 0.9999998808 1 1
> 0.9999998808 1 1 0.9999999404 1 0.9999999404 0.9999999404 1 1 1 1 1 1 1 1
> 0.9999999404 1 1 1 1 0.9999999404 0.9999998808 0.9999999404 0.9999999404 1 1
> 0.9999999404 0.9999999404 1 1 0.9999999404 0.9999999404 1 1 1 1 0.9999998808
> 1 1}}
> focal 31.5
> haperture 59.7509304
> vaperture 22.6922173
> near 5000
> far 20000
> win_translate {-0.09012138623 0}
> focal_point 5
> name Camera10_original
> selected true
> xpos 1953
> ypos 385
> }
>
>
>
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