This tool can be used to work out two measurements
- The distance along the floor the lens of the projection
- The distance up the slope to the lens of the projection
Download the tool for Macintosh here
Be sure to set up all the measurements properly! They are;
- Box lower height - the distance from the floor to the lower base of the box
- Box angle - the sloping angle of the box (use a spirit measure)
- Box width - width dimension
- Box length - length dimension
- Ceiling - the height of the ceiling where the projector is mounted
- Lens distance - the distance of the lens from the ceiling (important!)
Tie a weight to a piece of string and dangle it from the lens / ceiling.