SoTVizRender works in world coordinates and does not use explicit units.

Only SoTVizViewer uses the notion of units necessary to display speed and altitudes within the navigation tools. Conversions are possible but only affect information shown in the tools. (See Section 6.8, “Preprocessors”).

The default coordinate system has elevation along the Z axis, longitude along the X axis, and latitude along the Y axis. In other words, +Z is “up.”

	This is quite different from the traditional Open Inventor default coordinate system where +Y is “up.” This orientation (+Z up) is more appropriate for terrain data.