All data are global, with the assumption that positive Z is up, and if CADModelAzimuth is undefined or zero, positive X is East and positive Y is North. If CADModelAzimuth is defined it is the angle of positive Y to North, positive X is the vectorial product of Y and Z. If geometry is to be precise, use Longitude Latitude, and Elevation in the Location element to define the origin. Otherwise the origin is an arbitrary point. ShellGeometry is used to define a union of closed shells, where there is no intersection of any two of the given shells. |