import nuke
import nukescripts

def paintPoints():

geoNode = nuke.activeViewer().node()

camera = nuke.selectedNode()
if not camera.Class() in ( 'Camera', 'Camera2' ):
    nuke.message( 'Por favor, seleccione un nodo de la cámara primera')
    return

geoKnob = geoNode['geo']
objects = geoKnob.getGeometry()
if not objects:
    nuke.message( 'No se han encontrado geometría en %s' % geoNode.name() )

pts = []
for o in objects:

    objTransform = o.transform()
    for p in o.points():

        worldP = objTransform * nuke.math.Vector4(p.x, p.y, p.z, 1)
        pts.append( [worldP.x, worldP.y, worldP.z] )

curvesKnob = nuke.createNode( 'RotoPaint' )['curves']
task  = nuke.ProgressTask( 'painting points' )

for i, pt in enumerate( pts ):

    if task.isCancelled():
        break

    task.setMessage( 'painting point %s' % i )
    stroke = nuke.rotopaint.Stroke( curvesKnob )
    pos = nukescripts.snap3d.projectPoint( camera, pt )
    ctrlPoint = nuke.rotopaint.AnimControlPoint( pos )
    stroke.append( ctrlPoint )
    curvesKnob.rootLayer.append( stroke )
    task.setProgress( int( float(i)/len(pts)*100 ) )

b = nuke.nodes.Blur ()
k = nuke.Array_Knob("myctrl", "My Control")
b.addKnob(k)