Regarding particles issue.

I think I found an issue about particles: I can't manage to make it disappear.
I tried to recreate an animation from a tutorial (sadly it seems I can't post the tutorial URL) but the particle animation doesn't stop at the end like the one in the tutorial

My setup:

Hi - Could be many things. Could you copy & paste the comp? (i.e. select all nodes, copy and then in the forum post paste it between the code tags)

Sure, here is it:

Code: Select all

{
   Tools = ordered() {
      Merge2 = Merge {
         Inputs = {
            Background = Input {
               SourceOp = "MatteControl1",
               Source = "Output",
            },
            Foreground = Input {
               SourceOp = "pRender1",
               Source = "Output",
            },
            ApplyMode = Input { Value = FuID { "Screen" }, },
            PerformDepthMerge = Input { Value = 0, },
         },
         ViewInfo = OperatorInfo { Pos = { 615.333, 153.424 } },
      },
      MediaOut1 = MediaOut {
         Inputs = {
            Index = Input { Value = "0", },
            Input = Input {
               SourceOp = "Merge2",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 831.664, 74.4545 } },
      },
      pRender1 = pRender {
         Inputs = {
            _MotionBlurWarning = Input { Disabled = true, },
            GlobalOut = Input { Value = 599, },
            Width = Input { Value = 1920, },
            Height = Input { Value = 1080, },
            UseFrameFormatSettings = Input { Value = 1, },
            ["Gamut.SLogVersion"] = Input { Value = FuID { "SLog2" }, },
            OutputMode = Input {
               Value = FuID { "TwoD" },
               Disabled = true,
            },
            IntegrationMethod = Input { Value = FuID { "RK4" }, },
            ["MaterialID.MaterialID"] = Input { Value = 3, },
            ["ObjectID.ObjectID"] = Input { Value = 3, },
            Input = Input {
               SourceOp = "pTurbulence1",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 630.667, 75.2425 } },
      },
      pTurbulence1 = pTurbulence {
         ID = 80,
         Inputs = {
            XStrength = Input { Value = 0.5, },
            YStrength = Input { Value = 0.3, },
            StrengthOverLifeLUT = Input {
               SourceOp = "pTurbulence1StrengthOverLifeLUT",
               Source = "Value",
            },
            Input = Input {
               SourceOp = "pEmitter1",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 497.333, 74.6363 } },
      },
      pTurbulence1StrengthOverLifeLUT = LUTBezier {
         KeyColorSplines = {
            [0] = {
               [0] = { 0.5, RH = { 0.333333333333333, 0.5 }, Flags = { Linear = true } },
               [1] = { 0.5, LH = { 0.666666666666667, 0.5 }, Flags = { Linear = true } }
            }
         },
         SplineColor = { Red = 192, Green = 128, Blue = 64 },
      },
      pEmitter1 = pEmitter {
         ID = 76,
         Inputs = {
            Number = Input { Value = 500, },
            NumberVariance = Input { Value = 50, },
            Lifespan = Input { Value = 50, },
            LifespanVariance = Input { Value = 20, },
            Style = Input { Value = FuID { "ParticleStyleBlob" }, },
            Region = Input { Value = FuID { "BitmapRgn" }, },
            ["ParticleStyle.ColorControls"] = Input { Value = 1, },
            ["ParticleStyle.Red"] = Input { Value = 0, },
            ["ParticleStyle.Green"] = Input { Value = 0, },
            ["ParticleStyle.ColorOverLifeControls"] = Input { Value = 1, },
            ["ParticleStyle.ColorOverLife"] = Input {
               Value = Gradient {
                  Colors = {
                     [1] = { 0, 0, 1, 1 }
                  }
               },
            },
            ["ParticleStyle.Size"] = Input { Value = 0.23, },
            ["ParticleStyle.SizeVariance"] = Input { Value = 0.2, },
            ["ParticleStyle.SizeOverLife"] = Input {
               SourceOp = "pEmitter1SizeOverLife",
               Source = "Value",
            },
            ["ParticleStyle.BlurOverLife"] = Input {
               SourceOp = "pEmitter1BlurOverLife2D",
               Source = "Value",
            },
            ["BitmapRgn.Bitmap"] = Input {
               SourceOp = "MatteControl1_1",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 374, 75.8485 } },
      },
      pEmitter1SizeOverLife = LUTBezier {
         KeyColorSplines = {
            [0] = {
               [0] = { 0.5, RH = { 0.333333333333333, 0.5 }, Flags = { Linear = true } },
               [1] = { 0.5, LH = { 0.666666666666667, 0.5 }, Flags = { Linear = true } }
            }
         },
         SplineColor = { Red = 192, Green = 128, Blue = 64 },
      },
      pEmitter1BlurOverLife2D = LUTBezier {
         KeyColorSplines = {
            [0] = {
               [0] = { 0.5, RH = { 0.333333333333333, 0.5 }, Flags = { Linear = true } },
               [1] = { 0.5, LH = { 0.666666666666667, 0.5 }, Flags = { Linear = true } }
            }
         },
         SplineColor = { Red = 192, Green = 128, Blue = 64 },
      },
      MatteControl1 = MatteControl {
         Inputs = {
            ["Garbage.Matte"] = Input {
               SourceOp = "Polygon1",
               Source = "Mask",
            },
            ["Garbage.MaskNest"] = Input { Value = 1, },
            ["Garbage.MaskInverted"] = Input { Value = 1, },
            Background = Input {
               SourceOp = "Merge1",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 267.333, 150.394 } },
      },
      Polygon1 = PolylineMask {
         DrawMode = "InsertAndModify",
         DrawMode2 = "InsertAndModify",
         Inputs = {
            SoftEdge = Input { Value = 0.015, },
            MaskWidth = Input { Value = 1920, },
            MaskHeight = Input { Value = 1080, },
            PixelAspect = Input { Value = { 1, 1 }, },
            ClippingMode = Input { Value = FuID { "None" }, },
            ZRotation = Input { Value = -1.50886444067515, },
            Polyline = Input {
               SourceOp = "Polygon1Polyline",
               Source = "Value",
            },
            Polyline2 = Input {
               Value = Polyline {
               },
               Disabled = true,
            },
         },
         ViewInfo = OperatorInfo { Pos = { 262.667, 79.4848 } },
      },
      Polygon1Polyline = BezierSpline {
         SplineColor = { Red = 173, Green = 255, Blue = 47 },
         NameSet = true,
         KeyFrames = {
            [0] = { 0, RH = { 53.3333333333333, 0.333333333333333 }, Flags = { Linear = true, LockedY = true }, Value = Polyline {
                  Closed = true,
                  Points = {
                     { Linear = true, X = -0.0171692634073161, Y = -0.0375906884834007, LX = 0.000248180766809732, LY = -0.000220368797089148, RX = -0.000530591170083731, RY = -0.00031408840865442 },
                     { Linear = true, X = -0.0187610369175673, Y = -0.0385329537093639, LX = 0.000530591170083731, LY = 0.00031408840865442, RX = -0.000181241581837336, RY = -0.00010728711883227 },
                     { Linear = true, X = -0.0193047616630793, Y = -0.0388548150658607, LX = 0.000181241581837336, LY = 0.00010728711883227, RX = -0.00030895508825779, RY = -0.000182888160149256 },
                     { Linear = true, X = -0.0202316269278526, Y = -0.0394034795463085, LX = 0.00030895508825779, LY = 0.000182888160149256, RX = -0.000611593325932821, RY = -0.000362038612365723 },
                     { Linear = true, X = -0.0220664069056511, Y = -0.0404895953834057, LX = 0.000611593325932821, LY = 0.000362038612365723, RX = -0.000627543777227402, RY = -0.000371479739745458 },
                     { Linear = true, X = -0.0239490382373333, Y = -0.0416040346026421, LX = 0.000627543777227402, LY = 0.000371479739745458, RX = -0.000205329308907191, RY = -0.00012154628833135 },
                     { Linear = true, X = -0.0245650261640549, Y = -0.0419686734676361, LX = 0.000205329308907191, LY = 0.00012154628833135, RX = -0.00016401823228473, RY = -9.70917498017467e-005 },
                     { Linear = true, X = -0.0250570808609091, Y = -0.0422599487170413, LX = 0.00016401823228473, LY = 9.70917498017467e-005, RX = -2.01768838775697e-005, RY = -0.000179159635807562 },
                     { Linear = true, X = -0.0251176115125418, Y = -0.042797427624464, LX = 2.01768838775697e-005, LY = 0.000179159635807562, RX = -3.94017746051153e-005, RY = -0.000349865605433782 },
                     { Linear = true, X = -0.0252358168363571, Y = -0.0438470244407654, LX = 3.94017746051153e-005, LY = 0.000349865605433782, RX = -2.79340893030167e-005, RY = -0.000248036036888758 },
                     { Linear = true, X = -0.0253196191042662, Y = -0.0445911325514317, LX = 2.79340893030167e-005, LY = 0.000248036036888758, RX = -2.47738013664881e-005, RY = -0.000219973425070445 },
                     { Linear = true, X = -0.0253939405083656, Y = -0.045251052826643, LX = 2.47738013664881e-005, LY = 0.000219973425070445, RX = -3.53654225667318e-006, RY = -3.14029554526011e-005 },
                     { Linear = true, X = -0.0254045501351357, Y = -0.0453452616930008, LX = 3.53654225667318e-006, LY = 3.14029554526011e-005, RX = -8.78733893235525e-006, RY = -7.80224800109863e-005 },
                     { Linear = true, X = -0.0254309121519327, Y = -0.0455793291330338, LX = 8.78733893235525e-006, LY = 7.80224800109863e-005, RX = -4.80872889359792e-006, RY = -4.27017609278361e-005 },
                     { Linear = true, X = -0.0254453383386135, Y = -0.0457074344158173, LX = 4.80872889359792e-006, LY = 4.27017609278361e-005, RX = -1.7221396168073e-005, RY = -0.000152915716171265 },
                     { Linear = true, X = -0.0254970025271177, Y = -0.0461661815643311, LX = 1.7221396168073e-005, LY = 0.000152915716171265, RX = -2.20897297064463e-005, RY = -0.000196142743031184 },
                     { Linear = true, X = -0.0255632717162371, Y = -0.0467546097934246, LX = 2.20897297064463e-005, LY = 0.000196142743031184, RX = -1.37096891800563e-005, RY = -0.000121733794609706 },
                     { Linear = true, X = -0.0256044007837772, Y = -0.0471198111772537, LX = 1.37096891800563e-005, LY = 0.000121733794609706, RX = -1.39214098453522e-005, RY = -0.000123615066210429 },
                     { Linear = true, X = -0.0256461650133133, Y = -0.047490656375885, LX = 1.39214098453522e-005, LY = 0.000123615066210429, RX = -4.48587040106456e-006, RY = -3.98332873980204e-005 },
                     { Linear = true, X = -0.0256596226245165, Y = -0.0476101562380791, LX = 4.48587040106456e-006, LY = 3.98332873980204e-005, RX = -7.9181045293808e-006, RY = -7.03086455663045e-005 },
                     { Linear = true, X = -0.0256833769381046, Y = -0.047821082174778, LX = 7.9181045293808e-006, LY = 7.03086455663045e-005, RX = -1.73815836509069e-005, RY = -0.000154335051774979 },
                     { Linear = true, X = -0.0257355216890574, Y = -0.0482840873301029, LX = 1.73815836509069e-005, LY = 0.000154335051774979, RX = -1.38959536949793e-005, RY = -0.000123390307029088 },
                     { Linear = true, X = -0.0257772095501423, Y = -0.0486542582511902, LX = 1.38959536949793e-005, LY = 0.000123390307029088, RX = -1.50557607412338e-005, RY = -0.000133683284123739 },
                     { Linear = true, X = -0.025822376832366, Y = -0.0490553081035614, LX = 1.50557607412338e-005, LY = 0.000133683284123739, RX = -2.04394261042277e-005, RY = -0.000181487450997035 },
                     { Linear = true, X = -0.0258836951106787, Y = -0.0495997704565525, LX = 2.04394261042277e-005, LY = 0.000181487450997035, RX = -4.57714001337687e-006, RY = -4.06429171562195e-005 },
                     { Linear = true, X = -0.0258974265307188, Y = -0.0497216992080212, LX = 4.57714001337687e-006, LY = 4.06429171562195e-005, RX = -1.20261552768406e-005, RY = -0.000106783713394912 },
                     { Linear = true, X = -0.0259335049965493, Y = -0.0500420503482059, LX = 1.20261552768406e-005, LY = 0.000106783713394912, RX = 0.000147411897066976, RY = -9.78434533425998e-006 },
                     { Linear = true, X = -0.0254912693053484, Y = -0.0500714033842087, LX = -0.000147411897066976, LY = 9.78434533425998e-006, RX = 0.000254198908805847, RY = -1.6871839761734e-005 },
                     { Linear = true, X = -0.0247286725789309, Y = -0.0501220189034939, LX = -0.000254198908805847, LY = 1.6871839761734e-005, RX = 0.000117780640721321, RY = -7.81814257303874e-006 },
                     { Linear = true, X = -0.0243753306567669, Y = -0.050145473331213, LX = -0.000117780640721321, LY = 7.81814257303874e-006, RX = 0.000126887112855911, RY = -8.42163960138957e-006 },
                     { Linear = true, X = -0.0239946693181992, Y = -0.0501707382500172, LX = -0.000126887112855911, LY = 8.42163960138957e-006, RX = 0.00048044261833032, RY = -3.18897267182668e-005 },
                     { Linear = true, X = -0.0225533414632082, Y = -0.050266407430172, LX = -0.00048044261833032, LY = 3.18897267182668e-005, RX = 0.000567169860005379, RY = -3.76453002293905e-005 },
                     { Linear = true, X = -0.0208518318831921, Y = -0.0503793433308601, LX = -0.000567169860005379, LY = 3.76453002293905e-005, RX = 0.000868418564399083, RY = -5.76414167881012e-005 },
                     { Linear = true, X = -0.0182465761899948, Y = -0.0505522675812244, LX = -0.000868418564399083, LY = 5.76414167881012e-005, RX = 0.000217778608202934, RY = -1.44541263580322e-005 },
                     { Linear = true, X = -0.017593240365386, Y = -0.0505956299602985, LX = -0.000217778608202934, LY = 1.44541263580322e-005, RX = 0.000160944337646166, RY = -1.06828908125559e-005 },
                     { Linear = true, X = -0.0171104073524475, Y = -0.0506276786327362, LX = -0.000160944337646166, LY = 1.06828908125559e-005, RX = 0.000517438165843487, RY = -3.43446930249532e-005 },
                     { Linear = true, X = -0.015558092854917, Y = -0.0507307127118111, LX = -0.000517438165843487, LY = 3.43446930249532e-005, RX = 0.000129855548342069, RY = -8.61907998720805e-006 },
                     { Linear = true, X = -0.0151685262098908, Y = -0.0507565699517727, LX = -0.000129855548342069, LY = 8.61907998720805e-006, RX = 0.000915637860695521, RY = -6.07743859291077e-005 },
                     { Linear = true, X = -0.0124216126278043, Y = -0.05093889310956, LX = -0.000915637860695521, LY = 6.07743859291077e-005, RX = 6.78642342487971e-005, RY = 5.02156714598338e-005 },
                     { Linear = true, X = -0.0122180199250579, Y = -0.0507882460951805, LX = -6.78642342487971e-005, LY = -5.02156714598338e-005, RX = 4.25670295953751e-005, RY = 3.14973294734955e-005 },
                     { Linear = true, X = -0.0120903188362718, Y = -0.05069375410676, LX = -4.25670295953751e-005, LY = -3.14973294734955e-005, RX = 0.00010385550558567, RY = 7.6847771803538e-005 },
                     { Linear = true, X = -0.0117787523195148, Y = -0.0504632107913494, LX = -0.00010385550558567, LY = -7.6847771803538e-005, RX = 3.13933317859968e-005, RY = 2.32296685377757e-005 },
                     { Linear = true, X = -0.0116845723241568, Y = -0.0503935217857361, LX = -3.13933317859968e-005, LY = -2.32296685377757e-005, RX = 0.000142389287551244, RY = 0.000105361143747966 },
                     { Linear = true, X = -0.011257404461503, Y = -0.0500774383544922, LX = -0.000142389287551244, LY = -0.000105361143747966, RX = 0.000284816138446331, RY = 0.00021074836452802 },
                     { Linear = true, X = -0.010402956046164, Y = -0.0494451932609081, LX = -0.000284816138446331, LY = -0.00021074836452802, RX = 4.55776850382487e-005, RY = 3.37250530719757e-005 },
                     { Linear = true, X = -0.0102662229910493, Y = -0.0493440181016922, LX = -4.55776850382487e-005, LY = -3.37250530719757e-005, RX = 3.61175562851145e-005, RY = 2.67257238482319e-005 },
                     { Linear = true, X = -0.0101578703221939, Y = -0.0492638409301475, LX = -3.61175562851145e-005, LY = -2.67257238482319e-005, RX = -0.0001808692987673, RY = 0.000722703343127679 },
                     { Linear = true, X = -0.0107004782184958, Y = -0.0470957309007645, LX = 0.0001808692987673, LY = -0.000722703343127679, RX = -0.000116987464328607, RY = 0.000467448184887568 },
                     { Linear = true, X = -0.0110514406114817, Y = -0.0456933863461018, LX = 0.000116987464328607, LY = -0.000467448184887568, RX = -7.43872820424517e-005, RY = 0.000297230849172163 },
                     { Linear = true, X = -0.011274602457609, Y = -0.0448016937985853, LX = 7.43872820424517e-005, LY = -0.000297230849172163, RX = -5.39188559763153e-005, RY = 0.000215446085229031 },
                     { Linear = true, X = -0.011436359025538, Y = -0.0441553555428982, LX = 5.39188559763153e-005, LY = -0.000215446085229031, RX = -4.55323606729507e-006, RY = 1.81930760542552e-005 },
                     { Linear = true, X = -0.0114500187337399, Y = -0.0441007763147354, LX = 4.55323606729507e-006, LY = -1.81930760542552e-005, RX = -6.89706454674403e-006, RY = 2.75584558645884e-005 },
                     { Linear = true, X = -0.0114707099273801, Y = -0.0440181009471416, LX = 6.89706454674403e-006, LY = -2.75584558645884e-005, RX = -9.23437376817068e-006, RY = 3.68990004062653e-005 },
                     { Linear = true, X = -0.0114984130486846, Y = -0.0439074039459229, LX = 9.23437376817068e-006, LY = -3.68990004062653e-005, RX = -3.13880542914073e-005, RY = 0.000125418106714884 },
                     { Linear = true, X = -0.0115925772115588, Y = -0.0435311496257782, LX = 3.13880542914073e-005, LY = -0.000125418106714884, RX = -1.07052425543467e-005, RY = 4.27762667338053e-005 },
                     { Linear = true, X = -0.0116246929392219, Y = -0.0434028208255768, LX = 1.07052425543467e-005, LY = -4.27762667338053e-005, RX = -9.79354223484598e-006, RY = 3.91315614238265e-005 },
                     { Linear = true, X = -0.0116540735659264, Y = -0.0432854261413053, LX = 9.79354223484598e-006, LY = -3.91315614238265e-005, RX = -0.000159189661434543, RY = 0.000175943106904141 },
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                     { Linear = true, X = -0.38004196533601, Y = 0.171550693617857, LX = 0.0184243472238858, LY = -0.0281735089793566, RX = -0.00564666321884762, RY = -0.0274339810297377 },
                     { Linear = true, X = -0.396981954992553, Y = 0.0892487505286441, LX = 0.00564666321884762, LY = 0.0274339810297377, RX = -0.0171860480636302, RY = -0.023392414926539 },
                     { X = -0.444491316263934, Y = 0.0121576720801515, LX = 0.0174889663660466, LY = 0.0213452301441092, RX = -0.0283400993890901, RY = -0.0345889073637854 },
                     { X = -0.395342279137312, Y = -0.0454986436646266, LX = 0.00552556114974595, LY = 0.0384879000886269, RX = -0.00567079038846322, RY = -0.039499007561933 },
                     { X = -0.439368739529534, Y = -0.128192487182716, LX = 0.00127261603040518, LY = 0.0343895697799264, RX = -0.00115157379211477, RY = -0.031116947537391 },
                     { X = -0.395629051569131, Y = -0.107829756048858, LX = -0.0166456113308575, LY = 0.0137133988290011, RX = 0.00685464805217873, RY = -0.00564715888625004 },
                     { X = -0.376171820270636, Y = -0.122576977032216, LX = -0.00308981648468858, LY = 0.00787673074389266, RX = 0.0122812000586603, RY = -0.0198296302340604 },
                     { Linear = true, X = -0.339328220094655, Y = -0.182065867734397, LX = -0.0122812000586603, LY = 0.0198296302340604, RX = 0.00593968480393359, RY = 0.0235238603026538 },
                     { Linear = true, X = -0.321509165682855, Y = -0.111494286826436, LX = -0.00593968480393359, LY = -0.0235238603026538, RX = 0.0065133481464835, RY = -0.0289013198062964 },
                     { Linear = true, X = -0.301969121243404, Y = -0.198198246245325, LX = -0.0065133481464835, LY = 0.0289013198062964, RX = 0.00873547301009499, RY = 0.0264099592757053 },
                     { Linear = true, X = -0.275762702213119, Y = -0.118968368418209, LX = -0.00873547301009499, LY = -0.0264099592757053, RX = 0.0107754420441362, RY = -0.0301443035031213 },
                     { Linear = true, X = -0.243436376080711, Y = -0.209401278927573, LX = -0.0107754420441362, LY = 0.0301443035031213, RX = 0.00819460445287264, RY = 0.0278007840855215 },
                     { Linear = true, X = -0.218852562722093, Y = -0.125998926671008, LX = -0.00819460445287264, LY = -0.0278007840855215, RX = 0.00621968308814124, RY = -0.0289010811730708 },
                     { X = -0.196337882408595, Y = -0.194814934403821, LX = -0.00901162065860767, LY = 0.0161175141395351, RX = 0.00836700596029489, RY = -0.0149645900991396 },
                     { X = -0.161057654921422, Y = -0.174204511693279, LX = 0.00774890880642447, LY = -0.0173447740661504, RX = -0.00816080524596321, RY = 0.0182667779786972 },
                     { X = -0.144602811375442, Y = -0.13579026628087, LX = -0.00351204679676423, LY = -0.00947992980523668, RX = 0.00302976496800418, RY = 0.00817812684822405 },
                     { X = -0.131205276484085, Y = -0.128713959008661, LX = -0.00475558116322828, LY = 0.000147312680137441, RX = 0.0118704948212972, RY = -0.00330330893678155 },
                     { X = -0.127096909206741, Y = -0.193398564685384, LX = -0.00911120518039266, LY = 0.0173563437652448, RX = 0.0105735467290096, RY = -0.0201420266460357 },
                     { X = -0.0852443053539632, Y = -0.18419956717093, LX = -0.014475620316662, LY = -0.00197724914222161, RX = 0.00714782968263919, RY = 0.000976326463139812 },
                     { X = -0.0920616338425597, Y = -0.147346565051047, LX = -0.00457442895774009, LY = -0.0125118036377673, RX = 0.00860331730755247, RY = 0.0235314662611297 },
                     { X = -0.0516406384001032, Y = -0.131580306512551, LX = -0.0139886955797985, LY = -0.000871394193670065, RX = 0.0129019044443455, RY = 0.000803696415107302 },
                     { X = -0.0503688107034163, Y = -0.203329837885745, LX = -0.0116912283264112, LY = 0.0168985258888902, RX = 0.0144758123659289, RY = -0.0209233742868258 },
                     { X = -0.000488818553677952, Y = -0.176051340047415, LX = -0.0178235208785283, LY = -0.00292165728562288, RX = 0.0136430555354103, RY = 0.00223638786037562 },
                     { X = 0.0389464245570466, Y = -0.117690316612247, LX = -0.0102023303755503, LY = -0.00566977181793121, RX = 0.0159187165279156, RY = 0.00884656664901922 },
                     { X = 0.0428173968730242, Y = -0.203260103080531, LX = -0.0133239992857235, LY = 0.0239116650811155, RX = 0.0137562901027171, RY = -0.0246874358111673 },
                     { X = 0.0728930807409525, Y = -0.129694753106582, LX = -0.0159235690688258, LY = 0.00447419414419173, RX = 0.0291171812680958, RY = -0.00818133013820376 },
                     { X = 0.117182968637338, Y = -0.183310365137208, LX = -0.0125170714188459, LY = -0.0101339057311784, RX = 0.0117337210511883, RY = 0.00949970598215529 },
                     { X = 0.122066635202353, Y = -0.112310173630162, LX = -0.0141584020597166, LY = -0.00538295336693384, RX = 0.0215733365383849, RY = 0.00820207973119097 },
                     { X = 0.181930647289434, Y = -0.14009803074729, LX = -0.0187239044060382, LY = 0.00370969799264779, RX = 0.0118848235204902, RY = -0.00235469677021226 },
                     { X = 0.210171723293104, Y = -0.102096620372939, LX = -0.0109203447353789, LY = 0.00547598825118795, RX = 0.0172661073886567, RY = -0.00865806533707558 },
                     { X = 0.272111460937826, Y = -0.108361107258412, LX = -0.0218768190779881, LY = -0.00366249977314163, RX = 0.0166756723757364, RY = 0.00279175228276914 },
                     { X = 0.259904971477377, Y = -0.157692846615152, LX = 0.0208922149678957, LY = 0.0219006046568608, RX = -0.0100765888439452, RY = -0.0105629419071787 },
                     { X = 0.224462337688063, Y = -0.157991373124989, LX = 0.00941676765316746, LY = 0.0128090540805878, RX = -0.0159407655872109, RY = -0.0216832470338668 },
                     { X = 0.215876572734902, Y = -0.233031308871607, LX = -0.00628854283953948, LY = 0.0176277064753956, RX = 0.00750210225602033, RY = -0.0210295083803242 },
                     { X = 0.238356125679198, Y = -0.302084473740033, LX = -0.0051177936499431, LY = 0.0276700675789166, RX = 0.00937099547563642, RY = 0.0144270391581732 },
                     { Linear = true, X = 0.266469112106108, Y = -0.258803356265513, LX = -0.00937099547563642, LY = -0.0144270391581732, RX = 0.0148513441536463, RY = -0.00190006929895148 },
                     { Linear = true, X = 0.311023144567046, Y = -0.264503564162367, LX = -0.0148513441536463, LY = 0.00190006929895148, RX = 0.00638445507070788, RY = 0.0152700788953352 },
                     { Linear = true, X = 0.33017650977917, Y = -0.218693327476362, LX = -0.00638445507070788, LY = -0.0152700788953352, RX = 0.0151202003983245, RY = 0.000312142852956461 },
                     { Linear = true, X = 0.375537110974144, Y = -0.217756898917492, LX = -0.0151202003983245, LY = -0.000312142852956461, RX = 0.00728014764052382, RY = 0.0144400239361998 },
                     { Linear = true, X = 0.397377553895715, Y = -0.174436827108893, LX = -0.00728014764052382, LY = -0.0144400239361998, RX = 0.0168248328746846, RY = 0.00541773945551453 },
                     { Linear = true, X = 0.447852052519769, Y = -0.15818360874235, LX = -0.0168248328746846, LY = -0.00541773945551453, RX = -0.00460252545159915, RY = 0.0101055110150235 },
                     { Linear = true, X = 0.434044476164971, Y = -0.127867075697279, LX = 0.00460252545159915, LY = -0.0101055110150235, RX = -0.00465760304918576, RY = 0.00912199641486811 },
                     { Linear = true, X = 0.420071667017414, Y = -0.100501086452675, LX = 0.00465760304918576, LY = -0.00912199641486811, RX = 0.00378445058577466, RY = 0.019954746597131 },
                     { Linear = true, X = 0.431425018774738, Y = -0.0406368466612816, LX = -0.00378445058577466, LY = -0.019954746597131, RX = -0.0310753053558478, RY = -0.0236021327387513 },
                     { X = 0.395893454551697, Y = 0.0261333584785461, LX = -0.000793683542032575, LY = -0.0387460922060429, RX = 0.000288156461678735, RY = 0.0140666670536826 },
                     { X = 0.398201048374176, Y = 0.0590243451297283, LX = -0.000934717927790932, LY = -0.00645530045152582, RX = 0.00240610220558352, RY = 0.0166170576564086 },
                     { X = 0.40143546921144, Y = 0.0922778427617269, LX = 0.00103246312753755, LY = -0.00374696490330223, RX = -0.0107658862205886, RY = 0.00501477901378084 },
                     { Linear = true, X = 0.369137810549674, Y = 0.107322179803069, LX = 0.0107658862205886, LY = -0.00501477901378084, RX = -0.0108177138866713, RY = 0.0132282988738114 },
                     { Linear = true, X = 0.33668466888966, Y = 0.147007076424504, LX = 0.0108177138866713, LY = -0.0132282988738114, RX = -0.0102514101627274, RY = -0.0121252438395196 },
                     { Linear = true, X = 0.305930438401478, Y = 0.110631344905945, LX = 0.0102514101627274, LY = 0.0121252438395196, RX = -0.0176989797982973, RY = 0.0184761959277261 },
                     { Linear = true, X = 0.252833499006586, Y = 0.166059932689123, LX = 0.0176989797982973, LY = -0.0184761959277261, RX = -0.0178586605521189, RY = 0.00830627179354702 },
                     { X = 0.201778521837922, Y = 0.225630576972636, LX = 0.0208028575905977, LY = 0.00641784744251555, RX = -0.0265636181632633, RY = -0.008195090331558 },
                     { X = 0.147568510233912, Y = 0.142422471462886, LX = 0.0164995508721371, LY = -0.0315191473971751, RX = -0.0025818021979992, RY = 0.00493202883211801 },
                     { X = 0.14387029797257, Y = 0.161093263080875, LX = 0.00421874697894686, LY = 0.00142527644198975, RX = -0.0296187894209664, RY = -0.0100065099004599 },
                     { X = 0.0758484361945784, Y = 0.101262067149282, LX = 0.00337942678061839, LY = 0.0249342411239065, RX = -0.00103916693453656, RY = 0.0272792689740893 },
                     { Linear = true, X = 0.0727309353909687, Y = 0.18309987407155, LX = 0.00103916693453656, LY = -0.0272792689740893, RX = -0.0183157813241141, RY = -0.00286122896206738 },
                     { Linear = true, X = 0.0177835914186265, Y = 0.174516187185348, LX = 0.0183157813241141, LY = 0.00286122896206738, RX = -0.0172667096098499, RY = -0.0254416950223836 }
                  }
               } }
         }
      },
      Instance_Polygon1 = PolylineMask {
         DrawMode = "InsertAndModify",
         DrawMode2 = "InsertAndModify",
         SourceOp = "Polygon1",
         Inputs = {
            BorderWidth = Input { Value = 0.02, },
            Solid = Input { Value = 0, },
            Experimental = Input { },
            Polyline2 = Input {
               Value = Polyline {
               },
               Disabled = true,
            },
            FrameRenderScriptNest = Input { },
            StartRenderScripts = Input { },
            EndRenderScripts = Input { },
            CommentsNest = Input { },
            EffectMask = Input { }
         },
         ViewInfo = OperatorInfo { Pos = { 268.001, 36.4545 } },
      },
      Merge1 = Merge {
         Inputs = {
            Background = Input {
               SourceOp = "Keyser",
               Source = "Output",
            },
            Foreground = Input {
               SourceOp = "presents",
               Source = "Output",
            },
            Center = Input { Value = { 0.496497373029772, 0.366043613707165 }, },
            PerformDepthMerge = Input { Value = 0, },
         },
         ViewInfo = OperatorInfo { Pos = { 154.667, 80.9698 } },
      },
      MatteControl1_1 = MatteControl {
         Inputs = {
            ["Garbage.Matte"] = Input {
               SourceOp = "Instance_Polygon1",
               Source = "Mask",
            },
            ["Garbage.MaskNest"] = Input { Value = 1, },
            ["Garbage.MaskInverted"] = Input { Value = 1, },
            Background = Input {
               SourceOp = "Merge1",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 269.999, -7.78794 } },
      },
      Keyser = TextPlus {
         CtrlWZoom = false,
         NameSet = true,
         Inputs = {
            GlobalOut = Input { Value = 599, },
            Width = Input { Value = 1920, },
            Height = Input { Value = 1080, },
            UseFrameFormatSettings = Input { Value = 1, },
            ["Gamut.SLogVersion"] = Input { Value = FuID { "SLog2" }, },
            StyledText = Input { Value = "Keyser", },
            Font = Input { Value = "EVE Alpha", },
            Style = Input { Value = "Bold", },
            Size = Input { Value = 0.1654, },
            VerticalJustificationNew = Input { Value = 3, },
            HorizontalJustificationNew = Input { Value = 3, },
            ManualFontKerningPlacement = Input {
               Value = StyledText {
                  Array = {
                  },
                  Value = ""
               },
            },
         },
         ViewInfo = OperatorInfo { Pos = { 36.0003, 56.4546 } },
      },
      presents = TextPlus {
         NameSet = true,
         Inputs = {
            GlobalOut = Input { Value = 599, },
            Width = Input { Value = 1920, },
            Height = Input { Value = 1080, },
            UseFrameFormatSettings = Input { Value = 1, },
            ["Gamut.SLogVersion"] = Input { Value = FuID { "SLog2" }, },
            Center = Input { Value = { 0.82399299474606, 0.453271028037383 }, },
            AngleZ = Input { Value = 23.4944372006397, },
            StyledText = Input { Value = "presents", },
            Font = Input { Value = "Open Sans", },
            Style = Input { Value = "Bold Italic", },
            VerticalJustificationNew = Input { Value = 3, },
            HorizontalJustificationNew = Input { Value = 3, },
            ManualFontKerningPlacement = Input {
               Value = StyledText {
                  Array = {
                  },
                  Value = ""
               },
            },
         },
         ViewInfo = OperatorInfo { Pos = { 34.667, 102.182 } },
      }
   }
}

My thoughts:
You can either adjust your polygonmask animation, so that it completely clears the picture used as pemmiter-region (I used a different font, so that might be why I'm still seeing a bit of white in this picture a the end of the animation.)
Or you can stop emitting particles by keyframing the number of particles in the pemitter-controls tab.

Thank you for the answer, I don't understand what you say "adjust your polygonmask animation".

Edit: I get it ! Thank you

Have you animated the emitter to stop emitting ? You can do that by animating the Number slider on the pEmitter. Also, you can change the lifespan to make them stop earlier.