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. 10. Given a pixel index (i,j), find the corresponding point x on the image plane. Note that pixel index (i,j) refers to the center of pixel (i,j), with pixel (0,0) being the bottom left pixel and (W1,H1) being the top right pixel. Note that p is at the corner of the image, not the center of the lower left pixel. 11. Find the endpoint and (normalized) direction of the ray that should be cast through pixel (i,j)