**Surface Calculation**

- The 3D surface is an inverse R-squared function - i.e., the form of the gravitational field around a massive body.

- The surface is created with a triangle mesh, using either a rectangular grid or a radial pattern. You can switch between rectangular and radial grids using buttons in the upper right.

**Orbital Calculation**

- The "rolling ball" follows an orbital trajectory calculated using the inverse R-squared force. The orbit is not pre-calculated. The position is updated in real-time by integrating the equations-of-motion.

- The orbital path is shown in traditional top-down view in the orthographic window.

**Easter Egg**

- Of course. And it's VERY cool.

Here's the download:

Space Warp 1.2 MB zip file containing a GM 7 executable.