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Nan Inf Killer

ToolSets / Utility

Utility

2026-09-07

ToolSets/utility/naninfKiller.nk

utility

nan

inf

cleanup

rgba

fix

invalid

View on GitHub

Finds NaN and Inf in RGBA, zeros those samples, and fills the holes so invalid pixels do not break the rest of the Nuke comp.

Nan Inf Killer scans the incoming image for NaN and Inf in any RGBA channel. It builds a mask from those checks and treats every hit as a bad sample.

Bad samples are set to zero, then MarkerRemoval in radial mode fills the masked areas. The cleaned result is copied back over the original so the rest of the stream keeps a valid bbox and channel set.

Use it when a grade, merge, expression, or deep step has introduced invalid values and viewers, writes, or downstream nodes start failing or going black. The group has no tuning knobs; pipe it in and continue the tree.

Script code

set cut_paste_input [stack 0]
version 12.1 v4
push $cut_paste_input
Group {
 name naninfKiller
 tile_color 0x421010ff
 selected true
 xpos -1173
 ypos 1371
 addUserKnob {20 User l nanKiller}
 addUserKnob {26 ""}
 addUserKnob {26 lbl l "" +STARTLINE T "Nan Inf Killer v1.0"}
 addUserKnob {22 btn l DerekVFX.ca T "nuke.tcl('start', 'https://derekvfx.ca')" +STARTLINE}
}
 Input {
  inputs 0
  name Input
  xpos 447
  ypos -18
 }
set Ndc44400 [stack 0]
 Expression {
  expr0 "isinf(r) || isnan(r)"
  expr1 "isinf(g) || isnan(g)"
  expr2 "isinf(b) || isnan(b)"
  expr3 "isinf(a) || isnan(a)"
  name Expression10
  label "\[knob expr3]"
  xpos 370
  ypos 260
 }
 Expression {
  expr3 max(r,g,b,a)
  name Expression11
  label "\[knob expr3]"
  xpos 370
  ypos 370
 }
set Ndc75c00 [stack 0]
 Dot {
  name Dot2
  note_font_size 40
  xpos 404
  ypos 637
 }
push $Ndc75c00
push $Ndc44400
 Dot {
  name Dot1
  note_font_size 40
  xpos 241
  ypos 212
 }
 Copy {
  inputs 2
  from0 rgba.alpha
  to0 mask.a
  name Copy1
  xpos 207
  ypos 370
 }
 Expression {
  temp_name0 m
  temp_expr0 mask.a
  expr0 "m ? 0 : r"
  expr1 "m ? 0 : g"
  expr2 "m ? 0 : b"
  expr3 "m ? 0 : a"
  name Expression1
  label "\[knob expr3]"
  xpos 207
  ypos 460
 }
set Ndc74c00 [stack 0]
 Dot {
  name Dot5
  note_font_size 40
  xpos 92
  ypos 470
 }
 Shuffle {
  red alpha
  green alpha
  blue alpha
  name Shuffle1
  label "\[value in]"
  xpos 58
  ypos 552
 }
 MarkerRemoval {
  mode radial
  ctrlMask mask.a
  name MarkerRemoval1
  xpos 58
  ypos 594
 }
 Dot {
  name Dot4
  note_font_size 40
  xpos 92
  ypos 663
 }
push $Ndc74c00
 MarkerRemoval {
  mode radial
  ctrlMask mask.a
  name MarkerRemoval2
  xpos 207
  ypos 542
 }
 Copy {
  inputs 2
  from0 rgba.red
  to0 rgba.alpha
  name Copy2
  xpos 207
  ypos 653
 }
 Dot {
  name Dot3
  note_font_size 40
  xpos 241
  ypos 733
 }
push $Ndc44400
 Merge2 {
  inputs 2
  operation copy
  bbox B
  name Merge1
  xpos 447
  ypos 729
 }
set Ndca0c00 [stack 0]
 Output {
  name Output1
  xpos 447
  ypos 804
 }
push $Ndca0c00
 Viewer {
  frame_range 1017-1092
  colour_sample_bbox {0.8005697727 0.1044634357 0.8015194535 0.1054131091}
  input_process false
  gl_lighting true
  name Viewer1
  selected true
  xpos 823
  ypos 1061
 }
end_group