It’s worth mentioning that the CurveTool solution is not always reliable,
especially when dealing with something like an Alembic cache. I think it comes
down to some kind of a timing issue between Nuke’s 3D system and its API, but
if you try to snap to a moderately heavy deforming mesh, over time the
positions returned by the vertex position sampling function will start to lag
behind by one or more frames within your loop.
-Nathan
From: Erwan Leroy
Sent: Saturday, August 09, 2014 5:04 AM
To: Nuke Python discussion
Subject: Re: [Nuke-python] 3dposition won't update every frame when using
aforloop.
There is a built in function that does pretty much that, when you click "match
position" and select the animated one. I'm pretty sure I saw the code for that
in the reference, you might want to look at it.
On 9 Aug 2014 12:41, "Justin Fpc" <j.grosde...@gmail.com> wrote:
Hi !
I found a workaround a while ago to update the viewer to the next frame. You
want to use a curveTool node.
In your python script before the loop create your node then execute it for
frame "i" in your loop.
I don't have access to my scripts but you can refere to the Nuke python api.
Don't forget to delete your CurveTool node at the end of your script.
Cheers,
Justin
2014-08-09 12:21 GMT+01:00 Wouter Gilsing <shufflec...@hotmail.com>:
Hi there,
I'm kinda stuck with a script, and though I think its probably an easy fix,
I haven't found the solution yet.
A very simplified version of what I want:
- grab the 3d position of a selected vertex,
- print this value
- move to the next frame and repeat.
The script I came up with :
import nukescripts.snap3d
for i in range (0,100):
nuke.frame(i)
vertex = nukescripts.snap3d.getSelection()
for v in vertex:
vertexXpos = v.position[0]
print vertexXpos
The problem is that, when executed in a loop, the vertexposition is
identical for every frame (it always uses the values of the first frame). If I
remove the forloop and just execute the script manually on every frame it works
as it should.
My guess would be that I have to force the 3dviewer to refresh on every
frame so it updates the vertexpostion. Am I right, and if yes how can I achieve
this.
Thanks!
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