Ray casting onto a cloud textured a hemi-spherical skybox, and grass textured plane on the x-intercept. -Keyboard interface, -per "pixel" ray-casting (each pixel is actually a 4x10 rectangle) onto the sky and ground. -Fog blurs distant objects -Heads up display with gun sprite and shooting animation.
Desmos demo of distance calculation and "ray-casting" https://www.desmos.com/calculator/enq0ircfsk