4. In the figure, you are given the position of the camera (e), the location of the center of the image plane (c), an up vector (s), and the width w of the image plane (in 3D space). You are also given the number of pixels in height and width (H,W) of the image. 7. The up vector s we are given need not be orthogonal to n, so we cannot use it as our image's up vector v. Instead, we must first compute u^ orthogonal to n and s. Then, we can compute v^ from n and u^. Both u^ and v^ should be normalized. If we are standing at e and looking at c with s pointing roughly upwards, then u^ should be pointing to the right, and v^ should be pointing upwards. Make sure you check that these two vectors point in the correct direction. Don't worry about their length yet. 8. Next, we scale u^ to u and v^ to v so that u=wp and v=hp. In this way, adding u causes us to move right one pixel, and adding v causes us to move up one pixel. 9. Find the bottom left corner p