User:Labrat/Sandbox

The following axis tilt & rotation overlay is provided by permission of Bill Sempsrott from blueprintbowling.com. It is mathematically correct and is based on a point of view level with the centre of the ball and an infinite distance away, as explained in this article: http://blueprintbowling.com/blog/Posts/axis-rotation-and-axis-tilt-explained.aspx

The following graphic compares the Blueprint overlay (left) with the existing wiki overlay. The overlay on the right is a perspective view - the overlay lines for which are approximately correct for a viewer two feet from the ball. For video work from the back of the approach at the height of the centre of the ball, the Blueprint version is correct with a perspective error of less than 1%.