/*
CopyCatCam.jsx
version 1.5
(v1.2 adds depth of field link)
(v1.4 adds 'protected rotation' expression to ccc as default)
(v1.5 adds comp name to ccc layer name)
by Christopher Green (the guy who runs crgreen.com)
with tons of help from "urbanspaceman" at www.motion-graphics-exchange.com
and, of course, Dan Ebberts (www.motionscript.com).
*/

makeCopyCatCam();

function makeCopyCatCam()
{
    var versionNum = "1.5";
    var activeItem = app.project.activeItem;
    if (activeItem == null || !(activeItem instanceof CompItem)){
        alert("You need to select one (camera) layer.");
    } else {
        var selectedLayers = activeItem.selectedLayers;
        var selNum = activeItem.selectedLayers.length;
        if (!(selNum == 1)) {
            if (selNum == 0) {selNum = "No"} 
            alert(selNum + " layers selected. You need to select one (camera) layer.");
        } else {
            if (selectedLayers[0].constructor.name == "CameraLayer") {
                
                compName = activeItem.name;
                theCam = selectedLayers[0];
                camName = theCam.name;
                
                app.beginUndoGroup("CopyCatCam (\"" + camName + "\"/\"" + compName + "\")");
                activeItem.layers.addCamera((camName + " (" + compName + ") [ccc]"),[0,0]).startTime=0;
                ccc = activeItem.layer(1);
                ccc.depthOfField.setValue(1);// so, for slave camera, dof is always on,
                //////                       // but if dof is off for master camera, settings are set to infinite focus (as if dof is off)
                ///////camera settings expressions///////
                ccc.zoom.expression = "comp(\"" + compName + "\").layer("+"\'" + camName + "\'"+").zoom;";
                ccc.focusDistance.expression = "comp(\"" + compName + "\").layer("+"\'" + camName + "\'"+").focusDistance;";
                ccc.aperture.expression = "v = 0;\rif (comp(\"" + compName + "\").layer(\"" + camName + 
                "\").depthOfField == 1) {\rv = comp(\"" + compName + "\").layer(\"" + camName + "\").aperture;\r}\rv;";
                
                ccc.blurLevel.expression = "v = 0;\rif (comp(\"" + compName + "\").layer(\"" + camName + 
                "\").depthOfField == 1) {\rv = comp(\"" + compName + "\").layer(\"" + camName + "\").blurLevel;\r}\rv;";
                
                /////////////////////////////////////////
                
                ///////camera transformations////////////
                ccc.position.expression = "C=comp(\"" + compName + "\").layer(\"" + camName + "\");\rC.toWorld([0,0,0]);";
                ccc.pointOfInterest.expression = "position;";
                ccc.orientation.expression="C = comp(\"" + compName + "\").layer("+"\'"+camName+"\'"+");\ru = C.toWorldVec([1,0,0]);\rv = C.toWorldVec([0,1,0]);\rw = C.toWorldVec([0,0,1]);" 
                + "sinb = clamp(w[0],-1,1);\rb = Math.asin(sinb/thisComp.pixelAspect);\rcosb = Math.cos(b);\rif (Math.abs(cosb) > .0005) {\rc = -Math.atan2(v[0],u[0]);\r"
                + "a = -Math.atan2(w[1],w[2]);\r} else {\ra = Math.atan2(u[1],v[1]);\rc = 0;\r}\r[radians_to_degrees(a),radians_to_degrees(b),radians_to_degrees(c)];";
                
                ccc.rotationX.expression = "0;";
                ccc.rotationY.expression = "0;";
                ccc.rotationZ.expression = "0;";                
                /////////////////////////////////////////
                
                ccc.autoOrient = AutoOrientType.NO_AUTO_ORIENT;
                
                alert("Version " + versionNum + "\rYou may now copy and paste the \"ccc\" camera into any comp, and it should do what the original camera (\"" + 
                    camName + "\" in \"" + compName + "\") does.");
                app.endUndoGroup();
            } else {
                alert("That is not a camera layer.");
            }
            
        }
    }
    
}