Last Modified: December 3, 2014
Cartesian Model to Three Dimensional Model
In a 2-axis Cartesian model, we have X axis running left to right and Y axis running down to up.
Points in this model are defined by two values: X and Y.
In Visual Effects and Surveying, we add a third axis to define points in three values.
For this, we use a three dimensional Cartesian Model with X, Y and Z axes.
It’s important to note that, in Previzion, X-axis run back to front and Z-axis runs left to right.
In surveying, the same model applies, but the axes have a different name:
- Northing: X-axis
- Easting: Z-axis
- Elevation: Y-axis
Northing, Easting, Elevation to XYZ
When converting from the survey coordinate system from Northing,Easting,Elevation denomination to X,Y,Z denomination, flip the second and third values.
Just remember that Y is always up. And in Surveying terms Y is Elevation.
This difference is important to keep in mind because, in the survey files, Elevation, the Y-axis, is the third item, while in Previzion coordinates, Elevation is the second item in the coordinates.
- Northing = X
- Easting = Z
- Elevation = Y