essay 1

To create an 3D animation, the need of having a perspective to capture the images is the same as in a real-life shooting movie. The same challenges a photographer in real life has to find the right spot and adjusting the camera to capture exactly what is aimed to transmit for the viewer is also the challenge of the animator setting the virtual camera. The importance of the perspective is huge in the final result of a moving image as well as the importance of the scene modelling. The virtual camera can simulate aspects of the real camera such as the point of view, the direction of view, viewing angle, camera orientation and focal length (Spalter, 1999). Despite its similarities, there are also differences. The virtual camera has some capabilities such as time control (infinitely fast and slow movements), impossible movements, is invisible in the scene and flexibility (is easily recreated and modified) that is useful for animation and real live shooting. In terms of perspectives, there are some differences between the real and the virtual camera, what brings to two concepts related to projection: perspective and orthographic projections. The real camera always creates images in perspective projection, this kind of projection represents a single point of view where the objects get smaller according to its distance to the camera and parallel lines converge at the vanishing point (Fig. 11). The virtual camera, on the other hand, offers parallel projection where all the lines and planes are parallel to each other and also the perspective projection (Fig. 12). The 3D objects remain parallel in the projection and the objects distant to the camera do not change their size. This is a good choice for architectural and mechanical drawing where the accurate measures and dimensions of objects are important. When the parallel projection is showing the principal faces of the object it is called orthographic perspective (Spalter, 1999), one example is the isometric perspective. The perspective projections of the virtual camera are more realistic than the parallel projections (Spalter, 1999). To sum up, when the image converges to a single point of view, it is perspective projection. While orthographic projection ignores the perspective and allows to see the objects in its real measurements, projection perspective has the same effect as human eyes projection in the image.