Converts a world position pass (Input 1, Channels RGB) to a camera (Input 2) relative Nuke depth pass. CAUTION: Does not work with retimed camera input!

CS_PositionToDepth.tcl

set cut_paste_input [stack 0]
version 10.5 v3
push $cut_paste_input
Group {
 name CS_PositionToDepth
}
 Input {
  inputs 0
  name InputWPP
  xpos -920
  ypos -490
 }
 Dot {
  name Dot1
  xpos -886
  ypos -390
 }
set N6f56400 [stack 0]
 Dot {
  name Dot3
  xpos -886
  ypos -198
 }
set N6f56000 [stack 0]
push $N6f56400
 Add {
  channels rgb
  value {{-Axis1.world_matrix.3} {-Axis1.world_matrix.7} {-Axis1.world_matrix.11} 0}
  name Add1
  xpos -810
  ypos -394
 }
 ColorMatrix {
  matrix {
      {{Axis1.world_matrix.0} {Axis1.world_matrix.1} {Axis1.world_matrix.2}}
      {{Axis1.world_matrix.4} {Axis1.world_matrix.5} {Axis1.world_matrix.6}}
      {{Axis1.world_matrix.8} {Axis1.world_matrix.9} {Axis1.world_matrix.10}}
    }
  invert true
  name ColorMatrix1
  xpos -810
  ypos -346
 }
 Multiply {
  channels {-rgba.red -rgba.green rgba.blue none}
  value -1
  name Multiply1
  xpos -810
  ypos -298
 }
 Expression {
  channel0 depth
  expr0 1/b
  channel1 none
  channel2 none
  channel3 none
  name Expression1
  label "Nuke format zdepth"
  xpos -810
  ypos -256
 }
 MergeExpression {
  inputs 2
  channel0 depth
  expr0 "(Ar == 0 && Ag == 0 && Ab == 0 && Aa == 0) ? 0 : depth.Z"
  channel1 none
  channel2 none
  channel3 none
  name MergeExpression1
  label "fix background depth"
  xpos -810
  ypos -208
 }
 Dot {
  name Dot2
  xpos -776
  ypos -126
 }
push $N6f56000
 Copy {
  inputs 2
  from0 depth.Z
  to0 depth.Z
  name Copy1
  xpos -920
  ypos -136
 }
 Output {
  name Output
  xpos -920
  ypos -58
 }
 Input {
  inputs 0
  name InputCam
  xpos -590
  ypos -490
  number 1
 }
 Axis2 {
  name Axis1
  xpos -580
  ypos -414
 }
end_group