Throwing in one more possible alternative here. It’s a TCL function that just
walks up until it finds a knob named "focal" on any node hooked to any primary
input and returns the value of that. It’s a bit longer than your average
expression, but if you use multi-line expression mode, it’s easy to keep it
formatted nicely.
[proc camFocal node {
if {[value $node.input0.focal 0]} {
return [value $node.input0.focal]
} else {
return [camFocal [node $node.input0]] }
}]
[camFocal this]
If you need something more generic (like finding the first camera node), you
could replace the [value ...] tests with [class $node] == "Camera2" or
something. Of course, at a certain point, a Python expression is probably going
to become easier to maintain, but if you’re a die-hard TCL user for
expressions, it might be worth a shot.
Anyway, just another idea...
-Nathan
From: Erik Winquist
Sent: Thursday, August 11, 2011 6:50 PM
To: Nuke user discussion
Subject: Re: [Nuke-users] reference camera data with expressions
pretty slick workaround, michael.
nice one.
erik
Michael Garrett wrote: I got something working that seems to enable metadata
in the camera pipe. So you could add this right after the camera, where you
don't need a Dot to keep things clean, then access camera values via metadata.
Not ideal, but it could be helpful:
set cut_paste_input [stack 0]
version 6.2 v1
push $cut_paste_input
Group {
name AddCamMetaData
selected true
xpos -152
ypos -129
addUserKnob {20 User}
addUserKnob {41 shownmetadata l "" -STARTLINE T ViewMetaData2.shownmetadata}
}
Input {
inputs 0
name Input1
xpos 61
ypos -238
}
ModifyMetaData {
metadata {
{set focal "\[value parent.input0.focal]"}
}
name ModifyMetaData1
selected true
xpos 61
ypos -176
}
ViewMetaData {
name ViewMetaData2
xpos 61
ypos -150
}
Output {
name Output1
xpos 61
ypos -40
}
end_group
Blur {
size {{"\[metadata focal]"}}
name Blur3
selected true
xpos -152
ypos -103
}
On 11 August 2011 14:59, Michael Garrett <michaeld...@gmail.com> wrote:
Hi Ivan, great, thanks! I was just trying Camera1.focal
On 11 August 2011 14:47, Ivan Busquets <ivanbusqu...@gmail.com> wrote:
Hi Michael,
You can use tcl expressions in the "value" field of a ModifyMetadata node.
ex:
[value Camera1.focal]
On Thu, Aug 11, 2011 at 2:40 PM, Michael Garrett <michaeld...@gmail.com> wrote:
> Do you mean expression link to the modifymetadata "value" field? How
> exactly do you do this?
>
> On 11 August 2011 14:36, Frank Rueter <fr...@beingfrank.info> wrote:
>>
>> You can expression link a camera's parameter to generically create meta
>> data. But of course this creates the same problem. It would be good to have
>> multiple inputs for the ModifyMetadata node that allows any type of input
>> type to do this sort of thing (I guess input 0 would be the type being
>> passes through like a copy node)
>>
>>
>> On Aug 11, 2011, at 1:20 PM, Paul Raeburn <praeburn.li...@googlemail.com>
>> wrote:
>>
>> I wondered about that, but metadata node dont work in camera pipes, so I
>> ran into a dead end. Getting the name of the camera node node world be
>> great (as per Ivans recommendation). Ideally it would be great to et the
>> data from the camera pipe directly, so it can be modified by downstream axis
>> etc, but I assume that a foundry question.
>> Any suggestions on how to access the metadata of the camera pipe?
>>
>> On 12 August 2011 05:51, Frank Rueter <fr...@beingfrank.info> wrote:
>>>
>>> Try "[topnode]" which will give you the top most node of a stream.
>>> Obviously it won't work if the camera's parent pipe is connected. In that
>>> case you will need a script that walks upstream and returns the first camera
>>> node, then use that in your expression. Or use meta Data to make the camera
>>> info flow in the stream which is more elegant and probably faster.
>>>
>>>
>>>
>>> On Aug 10, 2011, at 8:24 PM, Paul Raeburn <praeburn.li...@googlemail.com>
>>> wrote:
>>>
>>> >
>>> > We have been using references tot he input node and then values to get
>>> > values from a camera node. ie. NoOp1.input.focal
>>> >
>>> > This works fine but breaks if there is anything in between the NoOp and
>>> > the camera, so you can tidy up the script with Dots or end up with
>>> > multiple
>>> > cameras just to be tidy.
>>> >
>>> > Is there a way to get camera stream directly, or even the name of the
>>> > camera node from the stream?
>>> >
>>> > thanks
>>> >
>>> > Paul Raeburn
>>> > _______________________________________________
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>
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weta digital
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