> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/e3d-training-manual/building-the-model/general-modeling-theory/global-coordinate-system.md).

# Global Coordinate System

How ENERCALC 3D defines its right-hand Cartesian X, Y, Z axes for modeling geometry, loads, and results.

The Global Coordinate System in ENERCALC 3D is a Cartesian system of X, Y and Z axes:

* Follows right-hand rule where Z cross X equals Y.
* Y axis is typically considered "up" in ENERCALC 3D ("Y to the sky").
* Axis triad is color coded to help with visualization, and coordinates with the view orientation buttons on the View toolbar:

X = Red

Y = Green

Z = Blue

![](https://3750289988-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FlRZtG5Ynp58kYzLHYbR7%2Fuploads%2Fgit-blob-6418eaaae76d6eae01055e6e3e3c1f502d87dfad%2FClip2.jpg?alt=media)

* Axis triad shows positive directions of all three axes, and algebraic sign is important!
* Global coordinate axis will be useful for specifying model geometry, specifying loads, and interpreting results.


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