Nuke Python

Nuke Python Scripts

Getting advanced settings

#For a specific knob, here for "mov32_settings" in a Write node
i = nuke.selectedNode()
print i.knob('mov32_settings').value()

#Or for the whole node - https://berniebernie.fr/wiki/
print(nuke.selectedNode())

Create multiple Writes nodes for multiples Reads - With RGBA channels activated

//Select Read nodes first

root_frame_path = "/YOUR_PATH"


nodes = nuke.selectedNodes()


for n in nodes:

    roto_name = n.name()

    n.setSelected(True)

    w = nuke.createNode( "Write" )

    write_name = roto_name.replace("Roto", "Write_")

    w.knob("name").setValue(write_name)

    image_path = "{root_frame_path}/{write_name}.png".format(root_frame_path=root_frame_path, write_name=write_name)

    w.knob("file").setValue(image_path)

for a in nuke.allNodes('Write'):

    a['channels'].setValue('rgba')

Change specific attribute on all nodes

//Works also with "selectedNodes"
//"render_mode" and "textured+wireframe" are examples of attributes to be changed.

sn = nuke.allNodes()

for n in sn:

        n.knob('render_mode').setValue("textured+wireframe")


//Alternative script for selectedNodes:

for a in nuke.selectedNodes('Write'):

a['channels'].setValue('rgba')


//Alternative script for allNodes:

for a in nuke.allNodes('Write'):

a['channels'].setValue('rgba')

Set localizationPolicy off on all Read nodes

sn = nuke.allNodes()

for n in sn:

        n.knob('localizationPolicy').setValue("off")

Set value of BBox parameter in Merge nodes to B

for n in nuke.allNodes('Merge2'):

    n['bbox'].setValue("B")

Count selected nodes

len(nuke.selectedNodes())

Export multiple files in DXV

#This script comes from the great Benjamin Vedrenne. DXV is the codec made by and for Resolume.
#Select all Read nodes or sources first.
#This script create a write node under each selected read nodes. Easy for fast and massive file conversion TO VIDEO.

for oReadNode in nuke.selectedNodes():

    oPath =  oReadNode['file'].value()
    first =  oReadNode['first'].value()
    last =  oReadNode['last'].value()
    newPath = oPath.split('/')[-2]
    oReadNode['selected'].setValue(True)
    Write = nuke.createNode ("Write")   

    #Specify file path here
    osdir = 'C:/DXV/tmp'
    
    Write.knob("beforeRender").setValue("import os\nif not os.path.isdir(os.path.dirname(nuke.thisNode()['file'].evaluate())):\n  os.makedirs(os.path.dirname(nuke.thisNode()['file'].evaluate()))")
    Write.knob('channels').setValue('rgba')
    Write.knob('file').setValue(osdir+'/'+newPath+".mov")
    Write.knob('file_type').setValue('mov')
    Write.knob('meta_codec').setValue('DXD3')
    Write.knob('mov32_fps').setValue(24)
    Write.knob('use_limit').setValue(True)
    Write.knob('first').setValue(first)
    Write.knob('last').setValue(last)
    Write.knob('mov32_settings').setValue('000000000000000000000000000001b67365616e000000010000000100000000000001a276696465000000010000000f00000000000000227370746c00000001000000000000000044584433000000000020000003ff000000207470726c000000010000000000000000000000000018000000000000000000246472617400000001000000000000000000000000000000530000010000000100000000156d70736f00000001000000000000000000000000186d66726100000001000000000000000000000000000000187073667200000001000000000000000000000000000000156266726100000001000000000000000000000000166d70657300000001000000000000000000000000002868617264000000010000000000000000000000000000000000000000000000000000000000000016656e647300000001000000000000000000000000001663666c67000000010000000000000000004400000018636d667200000001000000000000000052534c4d00000014636c75740000000100000000000000000000001c6364656300000001000000000000000043736552030000000000001c766572730000000100000000000000000003001c00010000')

Maxwell Render - Check .mxi sequence Sampling levels

//This script comes from the great Marc Dubrois.

def checkMXI_SL():
    '''takes mxi read node and checks its SLs metadata and outputs frames under certain treshold'''

    sl_threshold = 18.0
    txt = nuke.getInput('Print frames with SL below:', str(sl_threshold))
    if txt:
        sl_threshold = float(txt)
    output = ''

    task = nuke.ProgressTask("Checking MXI SLs") 
    task.setMessage("Progress")

    for node in nuke.selectedNodes():
        if node.Class() == 'Read':
            firstframe = int(node['first'].value())
            #lastframe = firstframe + 10
            lastframe = int(node['last'].value())
            for i in range(firstframe, lastframe):
                percentage = int(100.0*(i-firstframe)/(lastframe-firstframe))
                task.setProgress(percentage)
                if task.isCancelled(): 
                    break;

                sl = node.metadata('SAMPLING_LEVEL',i)
                if  sl < sl_threshold:
                        task.setMessage('Frame ['+str(i)+'] SL'+"{0:.1f}".format(sl))                        
                        logline = 'Frame ' + str(i) + ': ' + "{0:.2f}".format(sl) + '\n'
                        output = output + logline
            task.setProgress(100)
    del task

    p = nuke.Panel('Results')
    if output == '':
        output = 'All MXI are above or equal to '+str(sl_threshold)
    p.addNotepad('Results:',output)
    ret = p.show()

checkMXI_SL()