You’ve heard it a thousand times!
You should be paying attention to your bounding boxes!
Honestly, you and I both know nobody’s got time to check their bounding boxes, if they want to grow, who are we to tell them no?
But! What if I told you we can use the BBOX to be lazy, wouldn’t that be great?!
OK, allow me to set the scene.
You have just been assigned a shot with three characters dancing around merrily, and your task is to replace the dirt ground they were filmed on with a reflective futuristic cyberpunk dance floor.
You see that you have roto mattes for these three characters.
You are glad.
Until, you have to recreate their shadows and reflections.
A hard working compositor would split each of these characters into their own channel, make a mirror reflection vertically, and animate a transform to attach the reflection back to the original.
But a lazy compositor would never do something like this!
A lazy compositor would use the BBOX to automate this task.
Here’s how!
First, we need to extract each character’s bounding box.
We can do this by splitting them into their own individual layers and running the ‘autocrop’ TCL command.
You can bring up the command dialog box by pressing ‘X’ in the DAG context.
Now that we have each character’s BBOX, we can use the attributes of the BBOX to calculate the pivot point where we’re going to mirror our character vertically.
BBOX attributes? What are those you say?
I’m talking about ‘xyrt’!
x = left bound of the bbox
y = bottom bound of the bbox
r = right bound of the bbox
t = top bound of the bbox
Each of these are simply a point on a cartesian plane.
Which means, we can use some quick math to find the bottom center of the BBOX.
Let’s drop down a Transform node, and enter these expressions into the X and Y components of the ‘center’ knob and hook it up to the character:
bbox.r – (bbox.r – bbox.x)/2
bbox.y
You will see that the Transform’s center has now snapped to the center bottom of our character!
Next, let’s mirror our character by setting the scale Y in our Transform node to -1.
And let’s merge the reflection with the original character and hit play to see the result!
Rejoice!
Next, let’s set up a little controller for offsetting our reflection in Y.
Then, let’s copy and paste the Transform node to each of our characters and watch them party!
But we’re not done! What if we want to have finer control over our shadow/reflections?
So, let’s create a little ramp to mult down the opacity of our reflections.
Make a ramp node, and connect it up to the reflection, toggle on ‘replace’ as we don’t need the original reflection baked into our ramp.
Next, we set the ramp’s point0 and point1’s Y value to the top bound and bottom bound of the BBOX.
The ramp now goes from 0 to 1 from the base of our reflection.
We can then use this as a mask for a multiply node.
Let’s duplicate this to the other characters to see the final result!
I’d like to point out here that if you have characters coming in or disappearing off of screen, the bounding box calculations will be incorrect for those frames. You can see this error in our example here:
For unfortunate cases like these, we’d have either manually adjust those frames, or if we have overscanned roto ( I have never had overscanned roto lol), we can use a CurveTool with to calculate the autocrop data with a large enough ROI setting to accommodate for the overscan.
And at last, if you want to be an even LAZIER compositor, you can use this little Python script to automatically autocrop multiple nodes in one go!
def autoCrop():
"""
Basic Autocrop that operates on more than one selected read node
"""
try:
first_frame = int(nuke.root().knob('first_frame').getValue())
last_frame = int(nuke.root().knob('last_frame').getValue())
f_range = nuke.getInput("Frame Range To Calculate?\n\nExample: 1001-1230", str(first_frame) + "-" + str(last_frame))
if len(f_range.strip()) == 0:
nuke.message("Empty frame range.\n\nGave up!")
return
for char in f_range:
if char.isalpha():
nuke.message("Invalid characters.\n\nPlease format like this:\n1001-1230")
return
f_range_split = f_range.split('-')
f_first = int(f_range_split[0])
f_last = int(f_range_split[1])
layer = 'alpha'
for n in nuke.selectedNodes():
nukescripts.autocrop(f_first, f_last, 1, layer)
except AttributeError:
nuke.message('Invalid Range.\n\nGave up!')
returnAnd that concludes this article.
I hope you enjoyed reading it and have learned something new to help you be more lazy!
Nuke script pasted below!
set cut_paste_input [stack 0]
version 12.1 v2
push $cut_paste_input
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{x44151bd6 x40ac32a5 1 0 1} x43b69e13}}
{{{x 3
{0 -}} 0}
{{x42e15554 0 1 xc09cd4f5 1}
{x 2
{x42a68578 -}} x42a68578}}
{{{x 3
{0 -}} 0}
{{xc2e15558 0 1 x409cd500 1}
{x 2
{xc2a68578 -}} xc2a68578}}
{{{x43e00000 0 1 x4080a6c4 1}
{x4402f948 x418a0f9e 1 x418a0f9e 1}
{x4441f946 x41e95e8e 1 0 1} x44814970}
{{x44310000 0 1 x40d99069 1}
{x4440a77d x40e8c958 1 x40e8c958 1}
{x44538de3 x40f67c94 1 0 1} x4419c116}}
{{{xc2a95554 0 1 x404d0195 1}
{x 2
{xc282e508 -}} xc282e508}
{{x 3
{0 -}} 0}}
{{{x42a95554 0 1 xc04d0195 1}
{x 2
{x4282e508 -}} x4282e508}
{{x 3
{0 -}} 0}}
{{{x43420000 0 1 x4141cda6 1}
{x43a3c6c9 x41a2568a 1 x41a2568a 1}
{x4410e362 x41dd3b15 1 0 1} x44517cfc}
{{x44310000 0 1 x40d99069 1}
{x4440a77d x40e8c958 1 x40e8c958 1}
{x44538de3 x40f67c94 1 0 1} x4419c116}}
{{{x 3
{0 -}} 0}
{{xc2e15558 0 1 x409cd500 1}
{x 2
{xc2a68578 -}} xc2a68578}}}}
{cc
{f 8192}
{px
{1 x41200000 x41a00000 x41f00000}
{{{x 3
{0 -}} 0}
{{x42e15554 0 1 xc09cd4f5 1}
{x 2
{x42a68578 -}} x42a68578}}
{{{x 3
{0 -}} 0}
{{x 3
{0 -}} 0}}
{{{x42a95554 0 1 xc04d0195 1}
{x 2
{x4282e508 -}} x4282e508}
{{x 3
{0 -}} 0}}
{{{xc2a95554 0 1 x404d0195 1}
{x 2
{xc282e508 -}} xc282e508}
{{x 3
{0 -}} 0}}
{{{x 3
{0 -}} 0}
{{x 3
{0 -}} 0}}
{{{x 3
{0 -}} 0}
{{x42e15554 0 1 xc09cd4f5 1}
{x 2
{x42a68578 -}} x42a68578}}
{{{x 3
{0 -}} 0}
{{xc2e15558 0 1 x409cd500 1}
{x 2
{xc2a68578 -}} xc2a68578}}
{{{x 3
{0 -}} 0}
{{x 3
{0 -}} 0}}
{{{xc2a95554 0 1 x404d0195 1}
{x 2
{xc282e508 -}} xc282e508}
{{x 3
{0 -}} 0}}
{{{x42a95554 0 1 xc04d0195 1}
{x 2
{x4282e508 -}} x4282e508}
{{x 3
{0 -}} 0}}
{{{x 3
{0 -}} 0}
{{x 3
{0 -}} 0}}
{{{x 3
{0 -}} 0}
{{xc2e15558 0 1 x409cd500 1}
{x 2
{xc2a68578 -}} xc2a68578}}}}}
{tx 1 x43a08000 x4406c000}
{a osw x41200000 osf 0 str 1 spx x44800000 spy x44428000 sb 1 tt x41000000}}
{curvegroup Ellipse1 512 bezier
{{cc
{f 8192}
{px
{1 x41200000 x41a00000 x41f00000}
{{{xc2449d08 0 1 x3fee0880 1}
{x 2
{xc217fb70 -}} xc217fb70}
{{x 3
{0 -}} 0}}
{{{x43a38000 0 1 x40fc030b 1}
{x43d72e56 x4195a045 1 x4195a045 1}
{x442a9729 x41e3963a 1 0 1} x446b30c3}
{{x442b8000 0 1 x40f35a4f 1}
{x443c96fa x40f2750d 1 x40f2750d 1}
{x444f7d60 x40f1a6ba 1 0 1} x4415b094}}
{{{x42449d08 0 1 xbfee0880 1}
{x 2
{x4217fb70 -}} x4217fb70}
{{x 3
{0 -}} 0}}
{{{x 3
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{{xc2449d00 0 1 x4008d7ab 1}
{x 2
{xc2114c20 -}} xc2114c20}}
{{{x43d00000 0 1 x40a1468e 1}
{x43f9945a x418d1e99 1 x418d1e99 1}
{x443bca2b x41e7d710 1 0 1} x447c63c5}
{{x4441c000 0 1 x408b06a8 1}
{x444d0852 x40cb55af 1 x40cb55af 1}
{x445feeb8 x41029b34 1 0 1} x442621ec}}
{{{x 3
{0 -}} 0}
{{x42449d00 0 1 xc008d7d5 1}
{x 2
{x42114c10 -}} x42114c10}}
{{{x42449d08 0 1 xbfee0880 1}
{x 2
{x4217fb70 -}} x4217fb70}
{{x 3
{0 -}} 0}}
{{{x43a38000 0 1 x40fc030b 1}
{x43d72e56 x4195a045 1 x4195a045 1}
{x442a9729 x41e3963a 1 0 1} x446b30c3}
{{x44580000 0 1 x3f8acc09 1}
{x445d79aa x40a43651 1 x40a43651 1}
{x44706010 x410c630c 1 0 1} x44369344}}
{{{xc2449d08 0 1 x3fee0880 1}
{x 2
{xc217fb70 -}} xc217fb70}
{{x 3
{0 -}} 0}}
{{{x 3
{0 -}} 0}
{{x42449d00 0 1 xc008d7d5 1}
{x 2
{x42114c10 -}} x42114c10}}
{{{x436e0000 0 1 x412b5fc4 1}
{x43b4c852 x419e21f1 1 x419e21f1 1}
{x44196427 x41df5564 1 0 1} x4459fdc1}
{{x4441c000 0 1 x408b06a8 1}
{x444d0852 x40cb55af 1 x40cb55af 1}
{x445feeb8 x41029b34 1 0 1} x442621ec}}
{{{x 3
{0 -}} 0}
{{xc2449d00 0 1 x4008d7ab 1}
{x 2
{xc2114c20 -}} xc2114c20}}}}
{cc
{f 8192}
{px
{1 x41200000 x41a00000 x41f00000}
{{{xc2449d08 0 1 x3fee0880 1}
{x 2
{xc217fb70 -}} xc217fb70}
{{x 3
{0 -}} 0}}
{{{x 3
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{{x 3
{0 -}} 0}}
{{{x42449d08 0 1 xbfee0880 1}
{x 2
{x4217fb70 -}} x4217fb70}
{{x 3
{0 -}} 0}}
{{{x 3
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{{xc2449d00 0 1 x4008d7ab 1}
{x 2
{xc2114c20 -}} xc2114c20}}
{{{x 3
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{{x 3
{0 -}} 0}}
{{{x 3
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{{x42449d00 0 1 xc008d7d5 1}
{x 2
{x42114c10 -}} x42114c10}}
{{{x42449d08 0 1 xbfee0880 1}
{x 2
{x4217fb70 -}} x4217fb70}
{{x 3
{0 -}} 0}}
{{{x 3
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{{x 3
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{{{xc2449d08 0 1 x3fee0880 1}
{x 2
{xc217fb70 -}} xc217fb70}
{{x 3
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{{{x 3
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{{x42449d00 0 1 xc008d7d5 1}
{x 2
{x42114c10 -}} x42114c10}}
{{{x 3
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{{x 3
{0 -}} 0}}
{{{x 3
{0 -}} 0}
{{xc2449d00 0 1 x4008d7ab 1}
{x 2
{xc2114c20 -}} xc2114c20}}}}}
{tx 1 x43a38000 x4441c000}
{a osw x41200000 osf 0 str 1 spx x44800000 spy x44428000 sb 1 tt x40e00000}}}}}}
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 }
{ createBSpline str 1 ssx 1 ssy 1 sf 1 sb 1 }
{ createEllipse str 1 ssx 1 ssy 1 sf 1 sb 1 tt 7 }
{ createRectangle str 1 ssx 1 ssy 1 sf 1 sb 1 tt 8 }
{ createRectangleCusped str 1 ssx 1 ssy 1 sf 1 sb 1 }
{ 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_brush_hardness 0.200000003
toolbar_source_transform_scale {1 1}
toolbar_source_transform_center {1024 778}
colorOverlay {0 0 0 0}
lifetime_type "all frames"
motionblur_shutter_offset_type centred
source_black_outside true
name Roto1
xpos -56
ypos 228
}
set N9827c800 [stack 0]
Mirror2 {
flop true
name Mirror2_1
xpos 90
ypos 285
}
Transform {
translate {590 114}
scale 0.7549999952
center {960 540}
name Transform1
xpos 90
ypos 309
}
Expression {
expr1 1*a
name Expression2
xpos 90
ypos 362
}
push $N9827c800
Expression {
expr0 1*a
name Expression1
xpos -56
ypos 361
}
Merge2 {
inputs 2
operation plus
name Merge1
xpos -56
ypos 436
}
push $N9827c800
Mirror2 {
flop true
name Mirror2_2
xpos 253
ypos 283
}
Transform {
translate {-558 306}
scale 0.7549999952
center {960 540}
name Transform2
xpos 253
ypos 307
}
Expression {
expr2 1*a
name Expression3
xpos 253
ypos 364
}
Merge2 {
inputs 2
operation plus
name Merge2
xpos -56
ypos 506
}
Expression {
expr3 a>1?1:0
name Expression4
xpos -56
ypos 542
}
Crop {
box {0 0 1920 1080}
name Crop1
xpos -56
ypos 581
}
Output {
name Output1
xpos -56
ypos 658
}
Viewer {
frame 1
frame_range 1-30
colour_sample_bbox {-0.2833333313 0.2479166687 -0.2822916806 0.2489583343}
name Viewer1
selected true
xpos -298
ypos 470
}
end_group
set N5fecd600 [stack 0]
Dot {
name Dot2
selected true
xpos -253
ypos 227
}
Dot {
name Dot1
selected true
xpos -253
ypos 590
}
push $N5fecd600
Expression {
expr0 0
expr1 0
expr2 b
expr3 b
name Expression3
tile_color 0xffff
selected true
xpos 431
ypos 298
}
Crop {
box {{curve x1 595 594 594 594 594 594 593 592 592 591 586 577 562 544 523 500 472 445 419 398 379 359 340 321 302 284 265 244 222 201} {curve x1 548 561 574 587 600 613 626 639 652 665 679 694 710 727 743 755 753 750 746 742 736 729 721 712 701 686 654 620 586 549} {curve x1 1127 1127 1124 1107 1090 1074 1056 1039 1022 1004 985 967 948 929 910 893 878 862 844 825 806 785 762 739 716 696 676 656 637 617} {curve x1 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1067 1042 1016 991}}
name Crop3
label AutoCrop
selected true
xpos 431
ypos 322
icon warning.xpm
}
Transform {
scale {1 -1}
center {{"bbox.r - (bbox.r - bbox.x)/2"} {bbox.y+yOffset}}
name Transform3
selected true
xpos 431
ypos 449
addUserKnob {20 User}
addUserKnob {7 yOffset}
yOffset 10
}
set N31461800 [stack 0]
Ramp {
replace true
p0 {{curve} {bbox.t}}
p1 {{curve} {bbox.y}}
name Ramp1
selected true
xpos 572
ypos 449
}
push $N31461800
Multiply {
inputs 1+1
value 0
name Multiply1
selected true
xpos 439
ypos 524
}
push 0
push $N5fecd600
Expression {
expr0 0
expr1 g
expr2 0
expr3 g
name Expression2
tile_color 0xff00ff
selected true
xpos 164
ypos 296
}
Crop {
box {{curve x1 1743 1742 1742 1742 1742 1742 1741 1740 1740 1739 1734 1725 1710 1692 1671 1648 1620 1593 1567 1546 1527 1507 1488 1469 1450 1432 1413 1392 1370 1349} {curve x1 741 748 755 760 764 594 434 447 460 473 487 502 518 535 551 563 561 558 554 550 544 537 529 520 509 494 462 428 394 357} {curve x1 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1910 1887 1864 1844 1824 1804 1785 1765} {curve x1 783 801 818 834 849 863 874 883 892 908 919 927 934 942 950 957 963 969 972 973 971 963 952 937 919 898 875 850 824 799}}
name Crop2
label AutoCrop
selected true
xpos 164
ypos 320
icon warning.xpm
}
Transform {
scale {1 -1}
center {{"bbox.r - (bbox.r - bbox.x)/2"} {bbox.y+yOffset}}
name Transform2
selected true
xpos 164
ypos 435
addUserKnob {20 User}
addUserKnob {7 yOffset}
yOffset 10
}
set N31461c00 [stack 0]
Ramp {
replace true
p0 {{curve} {bbox.t}}
p1 {{curve} {bbox.y}}
name Ramp2
selected true
xpos 244
ypos 463
}
push $N31461c00
Multiply {
inputs 1+1
value 0
name Multiply2
selected true
xpos 164
ypos 522
}
push $N5fecd600
Expression {
expr0 r
expr1 0
expr2 0
expr3 r
name Expression1
tile_color 0xff0000ff
selected true
xpos -96
ypos 313
}
Crop {
box {{curve x1 0 0 5 27 49 71 94 117 140 164 188 212 237 263 288 311 331 352 375 400 426 454 484 514 545 572 598 624 650 676} {curve x1 146 163 180 198 215 232 250 267 284 301 319 340 361 383 404 420 418 414 409 403 395 386 375 363 349 329 287 242 196 148} {curve x1 704 705 705 705 705 705 706 707 708 709 715 728 747 771 799 830 867 902 936 964 990 1016 1041 1066 1091 1115 1141 1169 1197 1225} {curve x1 864 866 867 868 870 872 875 878 882 886 893 901 910 920 931 940 949 956 960 962 959 949 934 914 890 862 832 799 765 731}}
name Crop1
label AutoCrop
selected true
xpos -96
ypos 337
icon warning.xpm
}
Transform {
scale {1 -1}
center {{"bbox.r - (bbox.r - bbox.x)/2"} {bbox.y+yOffset}}
name Transform1
selected true
xpos -96
ypos 411
addUserKnob {20 User}
addUserKnob {7 yOffset}
yOffset 10
}
set N26c3e800 [stack 0]
Ramp {
replace true
p0 {{curve} {bbox.t}}
p1 {{curve} {bbox.y}}
name Ramp3
selected true
xpos -7
ypos 469
}
push $N26c3e800
Multiply {
inputs 1+1
value 0
name Multiply3
selected true
xpos -96
ypos 528
}
Merge2 {
inputs 4+1
name Merge1
selected true
xpos 164
ypos 625
}
Viewer {
frame 1
frame_range 1-100
colour_sample_bbox {-0.3541666567 0.2947916687 -0.353125006 0.2958333194}
name Viewer1
selected true
xpos 164
ypos 784
}
input + output 