Hi Ivan,
thanks a lot for that reply, very informative. I've played with the code
you posted and it works very well for adding keyframes to the rotation
parameter
layer = curves.toElement("Layer1")
t = layer.getTransform()
for i in range(1,10):
t.addRotationKey(i,0,0,i)
curvesKnob.changed()
However, it makes me realize that I have a lot to learn as I find the
syntax for the RotoPaint node quite difficult. What I want to do is to add
keyframes to the "transform_matrix" knob. I looked at the help functions,
but I'm still unsure how to access that. As far as I see
addTransformMatrixKey isn't available.
Maybe a workaround would be to somehow select a layer in the RotoPaint node
via python? Then I could just use the normal code, like
node["transform_matrix"].setValue().
Thanks a lot for your help!
Best regards,
Simon
2012/7/2 Ivan Busquets <ivanbusqu...@gmail.com>
> Hi Simon,
>
> Because those knobs don't exist per-layer/shape, and just manage the data
> of the layer(s) depending on the selection, I think you'll be better off
> just setting the transform data for the layer you're interested in, without
> interacting with the transform knobs.
>
> There's a couple of ways you can go about it:
>
> ...
>
> layer = curvesKnob.toElement("Layer1")
>
> t = layer.getTransform() # This is an AnimCTransform object that you can
> use to manage/store the transformation data for this layer
>
> t.addRotationKey(nuke.frame(),0,0,5.5)
>
> curvesKnob.changed() # Because we didn't change any knobs, the interface
> won't show the changes until you call this
>
>
> Or, if you don't want to be adding keys and would like to set a constant
> value instead, you could do:
>
> ...
>
> layer = curvesKnob.toElement("Layer1")
>
> t = layer.getTransform()
>
> rot_curve = nuke.rotopaint.AnimCurve()
>
> rot_curve.constantValue = 15
>
> t.setRotationAnimCurve(2,rot_curve)
>
> # Not sure why the index value needs to be 2 here.
>
> # Logic says it should be 0 (since rotation can only hold one value/curve),
>
> # but there might be a reason for it.
>
> curvesKnob.changed()
>
>
> For more info on the different classes/methods you can use to manage the
> data of Shapes, Layers, etc, look at:
>
>
> help('_curvelib')
>
> help('_curvelib.AnimCTransform')
>
> help('_curvelib.AnimCurve')
>
> etc.
>
>
> Some of the help and function signatures are not quite as detailed as they
> could be, but hopefully that'll give you enough information.
>
>
> Cheers,
>
> Ivan
>
>
> On Sun, Jul 1, 2012 at 11:50 AM, Simon Björk <bjork.si...@gmail.com>wrote:
>
>> Hi all,
>>
>> I'm having trouble to find the right code to access knobs on a RotoPaint
>> node (per layer). If I run nuke.selectedNode()["rotate"].setValue(20) on a
>> selected node it will set the value to the selected layer, but if no layer
>> is selected it doesn't work. If I run
>>
>> import nuke.rotopaint as rp
>>
>> rp = nuke.toNode("RotoPaint1")
>>
>> curvesKnob = rp['curves']
>>
>> layer = curvesKnob.toElement("Layer1")
>>
>>
>> I get access to Layer1. But how do I set a value to the rotate knob for
>> example?
>>
>>
>> Best regards,
>>
>> Simon
>>
>>
>>
>>
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>>
>
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