This program makes a 3D visualization of mathematical disks and shells in Processing controls: f to cycle between mousewheel modes( xy axis tilt, y axis stretch, x axis stretch_ mousewheel to control previously listed modes left and right arrow keys to rotate left and right Backspace/Delete/Mouseclick to toggle autorotation "D" for disk mode, "S" for sphere mode, "L" for 2D mode "P" for polar mode, "C" for cartesian mode to enter a function: press Enter. The function bar should turn red write function (use @ for theta in polar, all variables must be adjacent to operators or parenthesis. ie. 3x should be 3*x) press Enter again to submit function. The funciton bar will turn black "A" to toggle the axis display