I get a lot of questions about value gradation, especially on textured surfaces. Most recently, I was asked to show how to do text on a
curved surface. The technique is the same for showing text and texture on any curved surface in direct light.
Years ago, I came up with this little exercise that illustrates how light rays effect value contrasts on a curved surface. After all, we can see text on any surface because of value contrast.
Here's the exercise. I call it A Can of Worms.
