A more versatile, parametric and feathered Rectangle for Nuke.

CS_AdvancedRect.tcl

Group {
 name CS_AdvancedRect1
 addUserKnob {20 CS_AdvancedRect}
 addUserKnob {19 color}
 color 1
 addUserKnob {6 color_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
 addUserKnob {15 from}
 from {480 270 1440 810}
 addUserKnob {15 to}
 to {0 0 1920 1080}
 addUserKnob {7 roundness}
 roundness 0.2
 addUserKnob {7 lerp}
 lerp 1
}
 Input {
  inputs 0
  name Input
  xpos 510
  ypos -394
 }
 Roto {
  curves {{{v x3f99999a}
  {f 0}
  {n
   {layer Root
    {f 2097664}
    {t x44700000 x44070000}
    {a pt1x 0 pt1y 0 pt2x 0 pt2y 0 pt3x 0 pt3y 0 pt4x 0 pt4y 0 ptex00 0 ptex01 0 ptex02 0 ptex03 0 ptex10 0 ptex11 0 ptex12 0 ptex13 0 ptex20 0 ptex21 0 ptex22 0 ptex23 0 ptex30 0 ptex31 0 ptex32 0 ptex33 0 ptof1x 0 ptof1y 0 ptof2x 0 ptof2y 0 ptof3x 0 ptof3y 0 ptof4x 0 ptof4y 0 pterr 0 ptrefset 0 ptmot x40800000 ptref 0}
    {curvegroup Rectangle1 512 bezier
     {{cc
       {f 8192}
       {p
        {{=(parent.to.x-parent.from.x)*parent.roundness*parent.lerp xc3700001}
   {=((parent.to.t-parent.to.y)/2-parent.from.t)*parent.roundness*parent.lerp xc3070000}}
        {{=parent.from.x x43f00001}
      {=parent.from.t x444a8000}}
        {{=((parent.to.r-parent.to.x)/2+parent.to.x-parent.from.x)*parent.roundness*parent.lerp x436ffffe}
   {=(parent.to.t-parent.from.t)*parent.roundness*parent.lerp x43070000}}
        {{=((parent.to.r-parent.to.x)/2+parent.to.x-parent.from.r)*parent.roundness*parent.lerp xc3700000}
   {=(parent.to.t-parent.from.t)*parent.roundness*parent.lerp x43070000}}
        {{=parent.from.r x44b40000}
      {=parent.from.t x444a8000}}
        {{=(parent.to.r-parent.from.r)*parent.roundness*parent.lerp x43700008}
   {=((parent.to.t-parent.to.y)/2-parent.from.t)*parent.roundness*parent.lerp xc3070000}}
        {{=(parent.to.r-parent.from.r)*parent.roundness*parent.lerp x43700008}
   {=((parent.to.t-parent.to.y)/2-parent.from.y)*parent.roundness*parent.lerp x43070000}}
        {{=parent.from.r x44b40000}
      {=parent.from.y x43870000}}
        {{=((parent.to.r-parent.to.x)/2+parent.to.x-parent.from.r)*parent.roundness*parent.lerp xc3700000}
   {=(parent.to.y-parent.from.y)*parent.roundness*parent.lerp xc3070000}}
        {{=((parent.to.r-parent.to.x)/2+parent.to.x-parent.from.x)*parent.roundness*parent.lerp x436ffffe}
   {=(parent.to.y-parent.from.y)*parent.roundness*parent.lerp xc3070000}}
        {{=parent.from.x x43f00001}
      {=parent.from.y x43870000}}
        {{=(parent.to.x-parent.from.x)*parent.roundness*parent.lerp xc3700001}
   {=((parent.to.t-parent.to.y)/2-parent.from.y)*parent.roundness*parent.lerp x43070000}}}}
      {cc
       {f 8192}
       {p
        {}
        {{=(parent.to.x-parent.from.x)*parent.lerp xc3f00001}
   {=(parent.to.t-parent.from.t)*parent.lerp x43870000}}
        {}
        {}
        {{=(parent.to.r-parent.from.r)*parent.lerp x43f00004}
   {=(parent.to.t-parent.from.t)*parent.lerp x43870000}}
        {}
        {}
        {{=(parent.to.r-parent.from.r)*parent.lerp x43f00004}
   {=(parent.to.y-parent.from.y)*parent.lerp xc3870000}}
        {}
        {}
        {{=(parent.to.x-parent.from.x)*parent.lerp xc3f00001}
   {=(parent.to.y-parent.from.y)*parent.lerp xc3870000}}
        {}}}}
     {t 0}
     {a osw x41200000 osf 0 str 1 spx x44700000 spy x44070000 sb 1 ltn x44814000 ltm x44814000 tt x41000000 a
   {=parent.color 1}     b
   {=parent.color 1}     g
   {=parent.color 1}     r
   {=parent.color 1}}}}}}}
  toolbox {selectAll {
  { selectAll str 1 ssx 1 ssy 1 sf 1 }
  { createBezier str 1 ssx 1 ssy 1 sf 1 sb 1 tt 4 }
  { createBezierCusped str 1 ssx 1 ssy 1 sf 1 sb 1 tt 5 }
  { createBSpline str 1 ssx 1 ssy 1 sf 1 sb 1 tt 6 }
  { createEllipse str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { createRectangle str 1 ssx 1 ssy 1 sf 1 sb 1 tt 8 }
  { createRectangleCusped str 1 ssx 1 ssy 1 sf 1 sb 1 tt 9 }
  { brush str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { eraser src 2 str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { clone src 1 str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { reveal src 3 str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { dodge src 1 str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { burn src 1 str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { blur src 1 str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { sharpen src 1 str 1 ssx 1 ssy 1 sf 1 sb 1 }
  { smear src 1 str 1 ssx 1 ssy 1 sf 1 sb 1 }
} }
  toolbar_autokey false
  toolbar_brush_hardness 0.200000003
  toolbar_source_transform_scale {1 1}
  toolbar_source_transform_center {960 540}
  color {{parent.color 1} {parent.color} {parent.color} {parent.color}}
  colorOverlay {0 0 0 0}
  lifetime_type "all frames"
  lifetime_start 1034
  lifetime_end 1034
  motionblur_shutter_offset_type centred
  source_black_outside true
  name Roto1
  xpos 510
  ypos -322
 }
 Output {
  name Output1
  xpos 510
  ypos -250
 }
end_group