No, directives can’t be added or removed dynamically. They are only applied to HTML statically added to component templates. What you could do is to enable/disable the directive by passing a parameter (@Input()) to the directive to notify it to do something or not.
Note the example given is a left-handed, row major matrix. So the operation is: Translate to the origin first (move by –eye), then rotate so that the vector from eye to At lines up with +z: Basically you get the same result if you pre-multiply the rotation matrix by a translation –eye: [ 1 0 … Read more
The description you mention states that the projection by a pin-hole camera (one that does not introduce lens distortion) is modeled by R_u = f*tan(theta) and the projection by common fisheye lens cameras (that is, distorted) is modeled by R_d = 2*f*sin(theta/2) You already know R_d and theta and if you knew the camera’s focal … Read more
Look at http://qfox.nl/notes/116 var overlay = new google.maps.OverlayView(); overlay.draw = function() {}; overlay.setMap(map); var point = overlay.getProjection().fromLatLngToDivPixel(latLng); Ugly indeed. Much easier in v2 – another flaw of google api v3!
You do not need to have any objects in your scene to do this. You already know the camera position. Using vector.unproject( camera ) you can get a ray pointing in the direction you want. You just need to extend that ray, from the camera position, until the z-coordinate of the tip of the ray … Read more
for recognition or classification most OCR’s use neural networks These must be properly configured to desired task like number of layers internal interconnection architecture , and so on. Also problem with neural networks is that they must be properly trained which is pretty hard to do properly because you will need to know for that … Read more
From the MongoDB docs: A projection can explicitly include several fields. In the following operation, find() method returns all documents that match the query. In the result set, only the item and qty fields and, by default, the _id field return in the matching documents. db.inventory.find( { type: ‘food’ }, { item: 1, qty: 1 … Read more
MongoDB 2.2’s new $elemMatch projection operator provides another way to alter the returned document to contain only the first matched shapes element: db.test.find( {“shapes.color”: “red”}, {_id: 0, shapes: {$elemMatch: {color: “red”}}}); Returns: {“shapes” : [{“shape”: “circle”, “color”: “red”}]} In 2.2 you can also do this using the $ projection operator, where the $ in a … Read more