#AfterEffects #Script #KBar #MotionScript #Camera

Add target null and (optional) camera to comp and add MotionScript.com Auto Focus expression to camera.jsx

if (app.project.activeItem instanceof CompItem) {
    var myCam;
    if (app.project.activeItem.activeCamera instanceof CameraLayer) 
        myCam = app.project.activeItem.activeCamera;
        else 
        myCam = app.project.activeItem.layers.addCamera("Target Camera", [app.project.activeItem.width/2,app.project.activeItem.height/2]);
        var myNull = app.project.activeItem.layers.addNull();
        myNull.name = "Target";
        myCam.cameraOption.focusDistance.expression = "target = thisComp.layer(\"Target\");\nv1 = target.toWorld(target.anchorPoint) - toWorld([0,0,0]);\nv2 = toWorldVec([0,0,1]);\ndot(v1,v2);";
    } else {
        alert("Please select a comp");
        }

Added the "3D layer" to NULL(Target), that it would be possible to animate DOF in the plane Z.

if (app.project.activeItem instanceof CompItem) {
var myCam;
if (app.project.activeItem.activeCamera instanceof CameraLayer) 
myCam = app.project.activeItem.activeCamera;
else 
myCam = app.project.activeItem.layers.addCamera("Target Camera", [app.project.activeItem.width/2,app.project.activeItem.height/2]);
var myNull = app.project.activeItem.layers.addNull();
myNull.name = "Target";
myNull.threeDLayer = true;
myCam.cameraOption.focusDistance.expression = "target = thisComp.layer(\"Target\");\nv1 = target.toWorld(target.anchorPoint) - toWorld([0,0,0]);\nv2 = toWorldVec([0,0,1]);\ndot(v1,v2);";
} else {
alert("Please select a comp");
}