Positions and rotations JSON exporter for After Effects 3D elements

ae_to_json_exporter.jsx

function getJsonObjectFromLayer(layer) {
    var name = layer.name;
    var pX = layer.property("Position").value[0];
    var pY = layer.property("Position").value[1];
    var pZ = -layer.property("Position").value[2];
    var rX = -layer.property("xRotation").value;
    var rY = -layer.property("yRotation").value;
    var rZ = layer.property("zRotation").value;

    var jsonObject = '{"name":"' + name + '","x":' + pX + ',"y":' + pY + ',"z":' + pZ + ',"rotationX":' + rX + ',"rotationY":' + rY + ',"rotationZ":' + rZ + '}';

    return jsonObject;
}


function getAndWriteData(comp, layer) {

    var file = new File("positions.json");
    // create file
    var numEffects = layer.Effects.numProperties;
    // number of effects for the selected layer

    if (file.open("w")) {
        // open the file
        file.writeln('{"targets":[');
        // start write the JSON array "targets"        
        var effectLayer, matchName, i, idLayer, jsonObject;

        var listTransformEffectsToExport = [];
        var list3dLayerToExport = [];
        var j = 1
        var nbrTargetExported = 0;
        
        // let's look for a specific Custom Control
        for (i = 1; i <= numEffects; i++) {
            effectLayer = layer.Effects.property(i);
            matchName = effectLayer.matchName;
            if (matchName == "Custom TargetFCam") {
                // get ids of the targets and store them in an array                
                idLayer = effectLayer("Target " + j)
                while (effectLayer("Target " + j).value != 0) {
                    idLayer = effectLayer("Target " + j).value;
                    listTransformEffectsToExport.push(idLayer);
                    j++
                }
            }
            if (matchName == "3dLayer_Exporter") {
                // get ids of the other 3dlayer and store them in an array
                for (j = 1; j <= 50; j++) {
                    idLayer = effectLayer("Layer " + j).value
                    if (idLayer > 0) {
                        list3dLayerToExport.push(idLayer);
                    }
                }
            }
        }

        for (i = 0; i < listTransformEffectsToExport.length; i++) {            
            jsonObject = getJsonObjectFromLayer(comp.layer(listTransformEffectsToExport[i]))
            if (i < listTransformEffectsToExport.length - 1) {
                jsonObject += ',';
            }            
            // write JSON objects for each stored id Target
            file.writeln(jsonObject);
            // increase count of exported objects
            nbrTargetExported++;
        }

        file.writeln(']');
        // close JSON Array

        if (list3dLayerToExport.length > 0) {
            file.writeln(',"sprites3d":[');
            // start write the JSON array "sprites3d"
            for (i = 0; i < list3dLayerToExport.length; i++) {
                var layer = comp.layer(list3dLayerToExport[i]);
                jsonObject = getJsonObjectFromLayer(comp.layer(list3dLayerToExport[i]));
                if (i < list3dLayerToExport.length - 1) {
                    jsonObject += ',';
                }
                // write JSON objects for each stored id Layer
                file.writeln(jsonObject);
                // increase count of exported objects
                nbrTargetExported++;
            }
            file.writeln(']');
            // close JSON array
        }
        file.writeln('}');
        // close JSON object
        file.close();
        // close file
    }

    var stringTarget = nbrTargetExported > 1 ? "objects" : "object";
    alert(nbrTargetExported + " " + stringTarget + " exported successfully.");
    // provide info about number of objects exported
}

var comp = app.project.activeItem;
var layer = comp.selectedLayers[0];
// get current selected comp and layer

getAndWriteData(comp, layer);