With two-dimensional graphics, it's usually fairly easy to specify the coordinates that govern the location and size of a graphical figure. With 3D graphics, you might not have this convenience: Often you're working with primitives that have a fixed location and size, and you must use transforms to move and resize the figures. In Chapter 2 of my new book 3D Programming for Windows I show how to use TranslateTransform3D and ScaleTransform3D to assemble simple figures from unit cubes. (A unit cube has a width, height, and depth of 1 unit and is centered on the origin of the 3D coordinate system.) In Chapter 3 I continue those demonstrations with rotation, and Chapter 7 has some more advanced math behind deriving complex rotations in 3D space. I'd like to show another demonstration here using unit cubes to construct a fairly simple figure (a 7-pointed star) in 3D space. Fortunately all the trigonometry involved will be in two dimensions on the XY plane. Here's a seven-pointed star with a radius Read More...