TCL Commands

GETTING A KNOB’S VALUE OF A SPECIFIC NODE:

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#First frame of current read/write:

[value Read1.first]

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#Getting a knob’s value of current node:

[value this.first_frame]

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#Return label value of the input node:

[value this.size]

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#Name of the input node:

[value this.input0.label]

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#Name of the node before the group (Outside):

[value this.input.name]

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#Return 1 if the node is on error otherwise 0:

[value this.parent.input.name]

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#Get the bounding Box from the input of the node:

[value error]

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#Here some expression for the Format

format.x

format.y

width

height

bbox.x

bbox.y

bbox.w

bbox.h

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#Get the format from the input of the node:

#left boundary

[value input.bbox.x] 

#right boundary

[value input.bbox.r] 

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#Get the format from the input of the node:

#width

[value input.format.r]

#height

[value input.format.t]

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#Get the x position of the point #3 of the Bezier1 of the Roto1 node:

[value Roto1.curves.Bezier1.curve_points.3.main.x]

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#Return sample pixel value of the node Add1 reading in the red at position of knob Center:

[sample Add1 Red Center.x Center.y]

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#Get the value of the channel of a node, at a specific pixelcoordinates (e.g.: 10,10):

[sample [node input] red 10 10]

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#---------------------------------------------------------------------

#SET VALUES

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#Setting a knob’s value of a specific node:

[knob Read1.first 10]

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#Setting a variable, without returning that (useful in a textnode):

[set seq [value Read1.file]; return]

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#---------------------------------------------------------------------

#STRING

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#Replace string in current node file knob with regex (string “proj” to “projects” in all occurences):

[regsub -all "proj" [value [node this].file] "projects"] 

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#String map (replace multiple stringpairs) (this returns: xxffffxxyy):

[string map {"aa" "xx" "bb" "yy"} "aaffffaabb" ]

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#Compare strings:

[string equal [value Text1.message] "bla"]

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#Regexp matching:

[regexp -inline "_v\[0-9]{3}" [value Read2.file]] 

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#Evaluating string

[python os.getenv('rotate') == 'xavierb']

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#---------------------------------------------------------------------

#IF CONDITION

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[if {condition} {expr1} else {expr2}]

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#Example:

[if {[value blackpoint]==1} {return 2} {return 3}]

[if {[value blackpoint]==1} {return True} {return False}]

[if {[value blackpoint]==1} {return blackpoint} {return whitepoint}]

[if {[value filter]=="gaussian"} {return filter} {return False}]

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#OTHER METHOD

condition ? then : else

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#Example:

#if (r==1)? return 0: else (return r*2)

r ==1 ? 0 : r*2

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#---------------------------------------------------------------------

#PATH MANIPULATIONS:

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#Filepath without extension:

[file rootname [value [topnode].file]]

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#Filename only:

[basename [value [topnode].file ]]

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#Filename only without extension:

[basename[file rootname [value [topnode].file]]]

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#---------------------------------------------------------------------

#RELATIVE PATH

#In the Read node you can use the relative path for your footage/Obj

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#In your Read Node in the knob "file", use this:

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#Read file "render.exe" in the same folder of your file nuke 

[python {nuke.script_directory()}]/render.exr

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#Read file "render.exe" in the subfolder where your file nuke is  

[python {nuke.script_directory()}]/folder/render.exr

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#Read file "render.exe" in the subfolder of your .nuke folder  

[python {"/Users/gere/.nuke} ]/folder/render.exr