I take that back - is this what you are referring to?

 
Howard

set cut_paste_input [stack 0]
version 6.3 v8
push $cut_paste_input
Camera2 {
 name Camera1
 selected true
 xpos -1760
 ypos 3383
}
ColorBars {
 inputs 0
 name ColorBars1
 selected true
 xpos -1551
 ypos 3223
}
Card2 {
 z 2
 lens_in_focal {{parent.Camera1.focal}}
 lens_in_haperture 24.576
 control_points {3 3 3 6 

1 {-0.5 -0.5 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0.1666666865 0} 0 {0 0 0} 0 
{0 0 0} 
1 {0 -0.5 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0.1666666865 0} 0 
{0 0 0} 0 {0.5 0 0} 
1 {0.5 -0.5 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0.1666666865 0} 0 {0 0 0} 0 
{1 0 0} 
1 {-0.5 0 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0.1666666716 0} 0 {0 
-0.1666666716 0} 0 {0 0.5 0} 
1 {0 0 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0.1666666716 0} 0 {0 
-0.1666666716 0} 0 {0.5 0.5 0} 
1 {0.5 0 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0.1666666716 0} 0 {0 
-0.1666666716 0} 0 {1 0.5 0} 
1 {-0.5 0.5 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0 0} 0 {0 -0.1666666865 0} 0 
{0 1 0} 
1 {0 0.5 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0 0} 0 {0 
-0.1666666865 0} 0 {0.5 1 0} 
1 {0.5 0.5 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0 0} 0 {0 -0.1666666865 0} 0 
{1 1 0} }
 name Card2
 selected true
 xpos -1551
 ypos 3400
}
CheckerBoard2 {
 inputs 0
 name CheckerBoard1
 selected true
 xpos -1669
 ypos 3175
}
Roto {
 output alpha
 premultiply rgb
 replace true
 curves {AnimTree: "" {
 Version: 1.2
 Flag: 0
 RootNode: 1
 Node: {
  NodeName: "Root" {
   Flag: 512
   NodeType: 1
   Transform: 0 0 S 0 0 S 0 0 S 0 0 S 0 1 S 0 1 S 0 0 S 0 960 S 0 540 
   NumOfAttributes: 11
   "vis" S 0 1 "opc" S 0 1 "mbo" S 0 1 "mb" S 0 1 "mbs" S 0 0.5 "fo" S 0 1 "fx" 
S 0 0 "fy" S 0 0 "ff" S 0 1 "ft" S 0 0 "pt" S 0 0 
  }
  NumOfChildren: 1
  Node: {
   NodeName: "Bezier1" {
    Flag: 576
    NodeType: 3
    CurveGroup: "" {
     Transform: 0 0 S 1 91 0 S 1 91 0 S 1 91 0 S 1 91 1 S 1 91 1 S 1 91 0 S 1 
91 1028.5 S 1 91 734.5 
     Flag: 0
     NumOfCubicCurves: 2
     CubicCurve: "" {
      Type: 0 Flag: 8192 Dim: 2
      NumOfPoints: 12
      0 S 1 91 0 S 1 91 -2 0 0 S 1 91 1042 S 1 91 848 0 0 S 1 91 0 S 1 91 2 0 0 
S 1 91 -40 S 1 91 44 0 0 S 1 91 860 S 1 91 710 0 0 S 1 91 40 S 1 91 -44 0 0 S 1 
91 -42 S 1 91 -24 0 0 S 1 91 1046 S 1 91 646 0 0 S 1 91 42 S 1 91 24 0 0 S 1 91 
6 S 1 91 -18 0 0 S 1 91 1166 S 1 91 734 0 0 S 1 91 -6 S 1 91 18 0 
     }
     CubicCurve: "" {
      Type: 0 Flag: 8192 Dim: 2
      NumOfPoints: 12
      0 S 1 91 0 S 1 91 -2 0 0 S 1 91 0 S 1 91 0 0 0 S 1 91 0 S 1 91 2 0 0 S 1 
91 -40 S 1 91 44 0 0 S 1 91 0 S 1 91 0 0 0 S 1 91 40 S 1 91 -44 0 0 S 1 91 -42 
S 1 91 -24 0 0 S 1 91 0 S 1 91 0 0 0 S 1 91 42 S 1 91 24 0 0 S 1 91 6 S 1 91 
-18 0 0 S 1 91 0 S 1 91 0 0 0 S 1 91 -6 S 1 91 18 0 
     }
     NumOfAttributes: 44
     "vis" S 0 1 "r" S 0 1 "g" S 0 1 "b" S 0 1 "a" S 0 1 "ro" S 0 0 "go" S 0 0 
"bo" S 0 0 "ao" S 0 0 "opc" S 0 1 "bm" S 0 0 "inv" S 0 0 "mbo" S 0 0 "mb" S 0 1 
"mbs" S 0 0.5 "mbsot" S 0 0 "mbso" S 0 0 "fo" S 0 1 "fx" S 0 0 "fy" S 0 0 "ff" 
S 0 1 "ft" S 0 0 "src" S 0 0 "stx" S 0 0 "sty" S 0 0 "str" S 0 0 "sr" S 0 0 
"ssx" S 0 1 "ssy" S 0 1 "ss" S 0 0 "spx" S 0 960 "spy" S 0 540 "stot" S 0 0 
"sto" S 0 0 "sv" S 0 0 "sf" S 0 1 "sb" S 0 1 "nv" S 0 1 "view1" S 0 1 "ltn" S 0 
91 "ltm" S 0 91 "ltt" S 0 0 "tt" S 0 4 "pt" S 0 0 
    }
   }
   NumOfChildren: 0
  }
 }
}
}
 toolbox {selectAll {
  { selectAll ssx 1 ssy 1 sf 1 }
  { createBezier ssx 1 ssy 1 sf 1 sb 1 tt 4 }
  { createBSpline ssx 1 ssy 1 sf 1 sb 1 }
  { createEllipse ssx 1 ssy 1 sf 1 sb 1 }
  { createRectangle ssx 1 ssy 1 sf 1 sb 1 }
  { brush ssx 1 ssy 1 sf 1 sb 1 }
  { eraser src 2 ssx 1 ssy 1 sf 1 sb 1 }
  { clone src 1 ssx 1 ssy 1 sf 1 sb 1 }
  { reveal src 3 ssx 1 ssy 1 sf 1 sb 1 }
  { dodge src 1 ssx 1 ssy 1 sf 1 sb 1 }
  { burn src 1 ssx 1 ssy 1 sf 1 sb 1 }
  { blur src 1 ssx 1 ssy 1 sf 1 sb 1 }
  { sharpen src 1 ssx 1 ssy 1 sf 1 sb 1 }
  { smear src 1 ssx 1 ssy 1 sf 1 sb 1 }
} }
 toolbar_brush_hardness 0.200000003
 toolbar_lifetime_type all
 toolbar_source_transform_scale {1 1}
 toolbar_source_transform_center {320 240}
 colorOverlay 0
 lifetime_type "all frames"
 lifetime_start 91
 lifetime_end 91
 motionblur_shutter_offset_type centred
 source_black_outside true
 createNewTrack {{-1} "-1\t(none)\t-1" "1000\tNew Track Layer\t1000"}
 name Roto12
 selected true
 xpos -1669
 ypos 3253
}
Card2 {
 z 1
 lens_in_focal {{parent.Camera1.focal i}}
 lens_in_haperture 24.576
 translate {{curve i x1 0.19 x10 -0.2} 0 0}
 control_points {3 3 3 6 

1 {-0.5 -0.5 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0.1666666865 0} 0 {0 0 0} 0 
{0 0 0} 
1 {0 -0.5 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0.1666666865 0} 0 
{0 0 0} 0 {0.5 0 0} 
1 {0.5 -0.5 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0.1666666865 0} 0 {0 0 0} 0 
{1 0 0} 
1 {-0.5 0 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0.1666666716 0} 0 {0 
-0.1666666716 0} 0 {0 0.5 0} 
1 {0 0 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0.1666666716 0} 0 {0 
-0.1666666716 0} 0 {0.5 0.5 0} 
1 {0.5 0 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0.1666666716 0} 0 {0 
-0.1666666716 0} 0 {1 0.5 0} 
1 {-0.5 0.5 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0 0} 0 {0 -0.1666666865 0} 0 
{0 1 0} 
1 {0 0.5 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0 0} 0 {0 
-0.1666666865 0} 0 {0.5 1 0} 
1 {0.5 0.5 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0 0} 0 {0 -0.1666666865 0} 0 
{1 1 0} }
 name Card1
 selected true
 xpos -1669
 ypos 3389
}
Scene {
 inputs 2
 name Scene1
 selected true
 xpos -1659
 ypos 3429
}
push 0
ScanlineRender {
 inputs 3
 output_motion_vectors_type accurate
 name ScanlineRender1
 selected true
 xpos -1669
 ypos 3525
}
VectorBlur {
 channels rgba
 uv forward
 scale 0.25
 method forward
 alpha rgba.alpha
 name VectorBlur1
 selected true
 xpos -1669
 ypos 3590
}



>________________________________
> From: Howard Jones <[email protected]>
>To: Nuke user discussion <[email protected]> 
>Sent: Wednesday, 15 August 2012, 21:19
>Subject: Re: [Nuke-users] Re: Vector Blur and cards with alpha
> 
>
>Like he said - this should work
>
> 
>Howard
>
>
>
>>________________________________
>> From: Sean Brice <[email protected]>
>>To: Nuke user discussion <[email protected]> 
>>Sent: Wednesday, 15 August 2012, 20:10
>>Subject: Re: [Nuke-users] Re: Vector Blur and cards with alpha
>> 
>>
>> 
>>Use the forward mode in VectorBlur, with rgba.alpha set in the alpha
drop down option.
>>
>>uv channels : forward
>>method : forward
>>alpha [x] : rgba.alpha
>>
>>
>>
>>
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