Summary: In the Excel spreadsheet, change the highlighted values and see the figure change. The first tab is 2D. The second tab is 3D.
Details: I've heard over the years how matrices are used in 2D and 3D graphics to rotate, translate, and scale figures. I've never, however, really understood how it works. I decided to figure it out with the help of Wikipedia and Excel.
So, here is my matrix geometry spreadsheet. You can change the highlighted values and match the figure move. A second tab generalizes this to 3D and adds perspective projection.
- Carl (Twitter: @CarlKadie)