after effect
AE
效果预览
导入所需图片，预合成。
用钢笔工具将图片随机切割成多个碎片状。复制mask1，将mask2中的invert选中。mask1的expansion设为-1.5，mask2的expansion设为1.5, 得到碎片之间的透明间隔。
选中layer—auto trace，追踪alpha线条，设置参数后，每个碎片得到一个单独的mask，删掉之前的mask1和mask2
+Adjustment layer. +3个slider control 分别命名为position、rotation和random。
对图片合成的位置设置表达式：seedRandom((连接random slider)+index)value+[0,0,wiggle(0,(连接position slider))[2]]对图片合成的旋转设置表达式：seedRandom((连接random slider)+index) wiggle(0,(连接rotation slider))]
文件—运行脚本（run script file）.该脚本的作用是将一个图层中的n蒙板转换成n个图层。/*“MasksToLayers.jsx”www.nabscripts.com 04.2006(revised 04.2007)(revised 02.2009)Place each mask of each selected layer on separate layers.*/{// user variablesvar WANT_TO_USE_ADD_BLENDING_MODE_FOR_THE_NEW_LAYERS = false;var WANT_TO_MOVE_ANCHOR_POINT_TO_MASK_CENTER_FOR_THE_NEW_LAYERS = false;var WANT_TO_DISABLE_AUDIO_FOR_THE_NEW_LAYERS = true;var WANT_TO_TURN_OFF_VISIBILITY_FOR_INITIAL_SELECTION = true;// end of user variables/*—————————————————————————————————————–*/function removeLayerMasksExceptOne(layer, idToKeep)/*—————————————————————————————————————–*/{for (var id = layer.Masks.numProperties; id > 0; id–){if (id != idToKeep){layer.Masks.property(id).remove();}}}/*—————————————————————————————————————–*/function getBezierPoint(pts,t)/*—————————————————————————————————————–*/{var cX = 3 * (pts[1][0]-pts[0][0]);var bX = 3 * (pts[2][0]-pts[1][0]) – cX;var aX = pts[3][0] – pts[0][0] – bX – cX;var cY = 3 * (pts[1][1]-pts[0][1]);var bY = 3 * (pts[2][1]-pts[1][1]) – cY;var aY = pts[3][1] – pts[0][1] – bY – cY;var X = aX * Math.pow(t,3) + bX * Math.pow(t,2) + cX * t + pts[0][0];var Y = aY * Math.pow(t,3) + bY * Math.pow(t,2) + cY * t + pts[0][1];return [X,Y];}/*—————————————————————————————————————–*/function moveAnchorPointToMaskCenter(layer)/*—————————————————————————————————————–*/{var curTime = layer.containingComp.time;var shape = layer.Masks.property(1).maskShape.valueAtTime(curTime, false);var verts = shape.vertices;var intan = shape.inTangents;var outtan = shape.outTangents;// Discretization variablesvar numPts = 100;var dt = 1 / (numPts – 1);// Top, Bottom, Left, Right of the mask bounding boxvar T = Infinity;var B = -Infinity;var L = Infinity;var R = -Infinity;// Add first vertex if it’s a closed maskif (shape.closed){verts.push(verts[0]);intan.push(intan[0]);outtan.push(outtan[0]);}// Loop through each vertexfor (var j = 0; j < verts.length – 1; j++){var pts = [verts[j], verts[j + 1]];var ins = [intan[j], intan[j + 1]];var outs = [outtan[j],outtan[j + 1]];var ctrlPts = [pts[0], pts[0] + outs[0], pts[1] + ins[1], pts[1]];var curve = new Array();curve.push(getBezierPoint(ctrlPts, 0));for (var n = 0; n < numPts; n++){curve.push(getBezierPoint(ctrlPts, n * dt));// Current segmentvar tail = curve[n];var head = curve[n + 1];var curT = Math.min(tail[1], head[1]);var curB = Math.max(tail[1], head[1]);var curL = Math.min(tail[0], head[0]);var curR = Math.max(tail[0], head[0]);// Update box coordsif (curT < T) T = curT;if (curB > B) B = curB;if (curL < L) L = curL;if (curR > R) R = curR;}}// Reposition anchor point and adjust positionvar Xoffset = (R – L) / 2;var Yoffset = (B – T) / 2;var t = curTime;var preExprB = false;var anchPt = layer.anchorPoint;var pos = layer.position;var x = L + Xoffset;var y = T + Yoffset;var z = 0;var offset = [x,y,z] – anchPt.valueAtTime(t, preExprB);var newAnchPt = [x,y,z];var newPos = pos.valueAtTime(t, preExprB) + offset;if (anchPt.numKeys){anchPt.setValueAtTime(t, newAnchPt);}else{anchPt.setValue(newAnchPt);}if (pos.numKeys){pos.setValueAtTime(t, newPos);}else{pos.setValue(newPos);}}/*—————————————————————————————————————–*/function masksToLayers(layers)/*—————————————————————————————————————–*/{for (var layerId = 0; layerId < layers.length; layerId++){var layer = layers[layerId];if (layer.parent){alert(“\nParenting is not supported. Skipping layer ‘” + layer.name + “‘…”, “Masks To Layers”);continue;}for (var maskId = 1; maskId <= layer.Masks.numProperties; maskId++){var dupLayer = layer.duplicate();removeLayerMasksExceptOne(dupLayer, maskId);dupLayer.name = (layer.name + ” – ” + layer.Masks.property(maskId).name).substring(0,31);dupLayer.audioEnabled = !WANT_TO_DISABLE_AUDIO_FOR_THE_NEW_LAYERS;if (WANT_TO_USE_ADD_BLENDING_MODE_FOR_THE_NEW_LAYERS){dupLayer.blendingMode = BlendingMode.ADD;}if (WANT_TO_MOVE_ANCHOR_POINT_TO_MASK_CENTER_FOR_THE_NEW_LAYERS){moveAnchorPointToMaskCenter(dupLayer);}}if (WANT_TO_TURN_OFF_VISIBILITY_FOR_INITIAL_SELECTION){layer.enabled = false;}}}/*—————————————————————————————————————–*/function main()/*—————————————————————————————————————–*/{if (!app.project)return;var comp = app.project.activeItem;if (!comp || !(comp instanceof CompItem)){alert(“Select at least one layer.”, “Masks To Layers”);return;}app.beginUndoGroup(“Masks To Layers”);masksToLayers(comp.selectedLayers);app.endUndoGroup();}main();}