Hi David,
Welcome to the list.
If you don't mind using the older Bezier node, you can get what you want by
setting the gl_color with an onUserCreate callback. Of course, you'll have
to use 1 Bezier for each shape and put up with the other limitations in that
node.
In a menu.py:
def randomBezierGLColorCB(minlum=.7, maxlum=1):
tn = nuke.thisNode()
r = random.random() * minlum + (maxlum - minlum)
g = random.random() * minlum + (maxlum - minlum)
b = random.random() * minlum + (maxlum - minlum)
hexv = int('%02x%02x%02x%02x' % (r*255,g*255,b*255,255),16)
tn['gl_color'].setValue(hexv)
nuke.addOnUserCreate(randomBezierGLColorCB, nodeClass='Bezier')
I suppose you could do the same thing with Roto/RotoPaint nodes, but it
seems wasteful to use these heavier nodes for only 1 shape each just to get
the different colors for each shape.
-Ean
On Tue, Jun 28, 2011 at 4:58 AM, Nathan Rusch <[email protected]>wrote:
> There's no callback for onShapeCreation (you can find a list of the
> existing callbacks in the User Guide). The only callback that would
> currently come anywhere close to handling the kind of behavior you're after
> would be knobChanged, and it won't be able get you what you want.
>
> You could get as far as grabbing the correct knob, but until you actually
> finish the shape, its attribute object doesn't exist (or isn't editable), so
> you run into a dependency problem. Also, you have no way of knowing which
> shape was just created if you have any kind of layer hierarchy in your
> RotoPaint node and aren't creating shapes at the top layer. Finally, the
> knobChanged callback only lets you access very general information about the
> knob (knob, node, group context, etc.), so you would have no way of knowing
> whether the number of shapes in the RotoPaint node had actually changed, or
> if someone was just editing another shape (without saving its size to a
> custom knob every time a new shape was added).
>
> Hope this answers your question.
>
> -Nathan
>
> -----Original Message----- From: Melazoma
> Sent: Monday, June 27, 2011 7:43 PM
> To:
> nuke-python@support.**thefoundry.co.uk<[email protected]>
> Subject: [Nuke-python] Roto shape "onCreation" callback entry?
>
>
> Hi all,
>
> First time posting here.
>
> I'm trying to insert a piece of code that assigns a random color to a
> roto shape upon its creation, giving each shape a unique-ish color
> automatically.
> I'm still not that familiar with Nuke python, and I'm having a hard
> time finding a callback entry for something like "onShapeCreation" in
> the rotopaint module.
> I'm also at a loss with where to register this callback (if it
> exists). Should it be done in an init script (i.e. init.py or menu.py)
> or somewhere in Nuke's UI?
>
> Any pointers are greatly apprecited.
>
> This is the code I'm trying to run at each roto shape creation:
> ----------
> knob = nuke.toNode('Roto1')['curves']
> shape = knob.toElement('Bezier1')
> # perhaps grab the newly created shape object without referencing it
> by name? Is that possible?
> attrs = shape.getAttributes()
>
> randR = nuke.expression('random()')
> randG = nuke.expression('random()')
> randB = nuke.expression('random()')
> attrs.set('r', randR)
> attrs.set('g', randG)
> attrs.set('b', randB)
>
> # refresh viewer and color knob
> ----------
>
> Thanks in advance.
> Best,
> -David
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