This topic came up a few times on the mailing list already.
Heres an a part from the discussion I created February this year
(vertexSelection updates in a loop):
On 27/02/14 06:47, Ben DIckson wrote:
> fr = nuke.FrameRange(1, 100, 1)
> ct = nuke.nodes.CurveTool()
> ct['label'].setValue("Temp curvetool to update frames")
> for frame in fr:
> nuke.execute(ct, frame, frame)
> # ...vertexSelection stuff...
> nuke.delete(ct) # Clean up hacky CurveTool
>
>Theoretically this should be the same as doing nuke.frame(2)
>nuke.frame(3) etc, but.. as Frank described, it's not.
>
>It seems like nuke.frame(framenum) should trigger the update always..
>but I guess there might be cases where this wouldn't be desired..?
>
>Alternatively nuke.frame(framenum, refresh=True) or something, or just a
generic nuke.refresh() type method that could be called might be a good
compromise
On 27/02/14 06:47, Frank Rueter wrote:
> Many of us have been fighting this for years.
> One of the quick& (very) dirty workarounds is to create a dummy node
> that can be executed (i.e. CurveTool), execute it to force Nuke to
> re-evaluate the stream, then delete it. Do this for every
> iteration/frame and you should get the correct values if I remember
> correctly.
> I don't think the dummy node has to be connected to the nodes you are
> working with but haven't done this in a while myself.
>
> Afterwards don't forget to log a bug report to get this resolved
> finally. Maybe we could ask for a flag to set that forces Nuke to
> re-evaluate during a python loop, then set another flag to turn off
> that behaviour again if it means staying more efficient.
>
> Cheers,
> frank
I cant agree more, please submit a bug report!
Von: [email protected]
[mailto:[email protected]] Im Auftrag von
Johannes Hezer
Gesendet: Samstag, 9. August 2014 14:09
An: [email protected]
Betreff: Re: [Nuke-python] 3dposition won't update every frame when using a
forloop.
http://www.nukepedia.com/python/3d/animatedsnap3d/
This is probably what you are after.
Cheers
Johannes
Am 8/9/14 14:04 PM, schrieb Erwan Leroy:
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" <[email protected]> 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 <[email protected]>:
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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