I assuming you're not using the Nuke 7 public beta for this, because there
is a "DepthToPosition" node in there! Otherwise, try this. I'm using
Topnode for the camera input to grab the projection knobs.
Group {
inputs 2
name ZtoPworld
help "Creates Pworld point data from a raw depth channel and an input
camera."
selected true
xpos -201
ypos 45
addUserKnob {20 User}
addUserKnob {41 from0 l "input z channel" T Copy1.from0}
}
Input {
inputs 0
name Input
xpos 715
ypos -750
}
set N219b4e80 [stack 0]
push $N219b4e80
Copy {
inputs 2
from0 depth.Z
to0 rgba.blue
name Copy1
selected true
xpos 715
ypos -715
}
Expression {
expr0 cx
expr1 cy*(input.width/input.height)*input.pixel_aspect
name Expression7
label NDC
xpos 715
ypos -660
}
Expression {
temp_name0 h_tan
temp_expr0 (haperture/2)/focal
temp_name1 v_tan
temp_expr1 (vaperture/2)/focal
expr0 b*(r*h_tan)
expr1 b*(g*v_tan)
name Expression8
label "NDC to Pcam"
xpos 715
ypos -607
addUserKnob {20 User}
addUserKnob {7 focal}
focal {{"\[topnode parent.input1].focal"}}
addUserKnob {7 haperture}
haperture {{"\[topnode parent.input1].haperture"}}
addUserKnob {7 vaperture}
vaperture {{"\[topnode parent.input1].vaperture"}}
}
Multiply {
channels {-rgba.red -rgba.green rgba.blue}
value -1
name Multiply3
xpos 715
ypos -530
}
ColorMatrix {
matrix {
{{Axis1.world_matrix.0 i} {Axis1.world_matrix.1 i}
{Axis1.world_matrix.2 i}}
{{Axis1.world_matrix.4 i} {Axis1.world_matrix.5 i}
{Axis1.world_matrix.6 i}}
{{Axis1.world_matrix.8 i} {Axis1.world_matrix.9 i}
{Axis1.world_matrix.10 i}}
}
name ColorMatrix3
label "Inverse Cam rotation"
xpos 715
ypos -492
}
Add {
channels rgb
value {{Axis1.world_matrix.3 i} {Axis1.world_matrix.7 i}
{Axis1.world_matrix.11 i} {curve i}}
name Add3
label "World minus Camera pos"
xpos 715
ypos -441
}
set N525d9a0 [stack 0]
Output {
name Output1
xpos 715
ypos -346
}
Input {
inputs 0
name cam
xpos 498
ypos -684
number 1
}
Axis2 {
display off
selectable false
name Axis1
xpos 508
ypos -637
}
push $N525d9a0
Viewer {
frame 10
input_process false
name Viewer1
xpos 959
ypos -619
}
end_group
On 19 November 2012 19:45, Frank Rueter <fr...@beingfrank.info> wrote:
> yes, that's how I can do it and probably will (happy to use your setup in
> stead of reinventing the wheel).
> I did send in a feature request to have a DeepToPosition node though
> (though it should probably be a "DepthToPosition" node seeing you don't
> need deep for this)
>
>
>
> On 20/11/12 4:39 PM, Michael Garrett wrote:
>
> If you're just trying to create a regular "flat" position pass, can't you
> just flatten deep.front and then use a regular Nuke Expression node plus
> the Camera matrix to convert that to position? I can send you the setup if
> you need it.
>
> I've gone over the expressions required to convert a deep opacity file
> to deep position (position render as deep data) and as we know, the
> DeepExpression node doesn't support some things yet.
>
>
> On 19 November 2012 01:27, Patrick Heinen
> <mailingli...@patrickheinen.com>wrote:
>
>> Ok, i thought you wanted to use the DeepExpression node to calculate
>> those xyz coordinates, which as you say would be possible, but not
>> comfortable. Yes Deep is always camera relative, that's the drawback with
>> it. But as the DeepToPoints node exists, you're right that it shouldn't be
>> to complicated to write a deep to point position node.
>> +1 for the feature request, maybe it makes it into the releas *hope* ;)
>>
>> cheers,
>> Patrick
>>
>> ----- Original Message -----
>> From: fr...@beingfrank.info
>> To: nuke-users@support.thefoundry.co.uk
>> Date: 19.11.2012 02:42:30
>> Subject: Re: [Nuke-users] deep position in DeepExpression?
>>
>>
>> > Hi Patrick,
>> >
>> > x and y only give you screen space positions, not world positions.
>> > With the camera and depth available obviously this can be converted to
>> > world position, but I'd really like to see a built in solution.
>> > Basically like the DeepToPoints but a DeepToPosition.
>> >
>> > The brute force way would be to render a full resolution DeepToPoint
>> > through the ScanlineRender node and generate positon vectors in it. But
>> > that is stupidly slow and really shouldn't be necessary.
>> >
>> > Will send in a feature request.
>> >
>> > Cheers,
>> > frank
>> >
>> > On 19/11/12 11:41 AM, Patrick Heinen wrote:
>> >> Hi Frank,
>> >>
>> >> you should be able to acces x and y with x and y. I was at least able
>> to produce a uv map, if that's the kind of funcionality you're somehow
>> looking for. However the Deep Expression Node is not working exactly as the
>> Expression Node. This came up on the mailinglist and there is a feature
>> request logged for expanding the deep expression node to match the
>> functionality of the expression node #27372.
>> >> Tell me if you succeed in your attempt of creating a world position
>> pass, I would really be interested in that.
>> >>
>> >> cheers
>> >> Patrick
>> >> Am 18.11.2012 um 21:58 schrieb Frank Rueter:
>> >>
>> >>> Is it possible to get a pixel's position in a DeepExrpression node? I
>> am trying to create a world position pass from the image and the associated
>> camera.
>> >>>
>> >>> Cheers,
>> >>> frank
>> >>> _______________________________________________
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>> >>
>> >
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>
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