Debugging in 2 or 3 dimensions
When you are trying to figure out what isn’t working as expected in computer graphics, check your orientation.
Left and right, up and down, these could be reversed from what you were thinking.
I know it sounds simple. But you could be caught up in texture projections on rows of objects, and the whole time you were looking at the wrong object. Like I was today.
When you’re just staring at code, it’s easy to get turned around. Debug widgets help make this clear. This is a good time to check your assumptions.