Making my way through the Understanding 3D space recipe from the Processing 2 Creative programming cookbook source code on GitHub.
In this recipe I learned how set a variable for depth and zSpeed and also how to change the variable inside the draw function for animation. I also learned that if you want to use the rect or ellipse functions draw shapes in a 3D environment you need to use the translate function to change the coordinate system. Normally, the translate function uses x, y and z coordinates in a 3D environment, but in this Sketch the z coordinate has been replaced by the depth variable. Using the depth variable for the z coordinate with the for loop and the if test animates the four coloured squares. Also, the squares are always drawn at 0, 0. It’s just the point of origin in z-space being moved.