Graphics Programs Reference
In-Depth Information
Chapter 3. Coordinate Systems
Along with visualization, the creation of other working planes is imperative for proper
3D modeling. Frequently, we have to create objects that are not aligned with the cur-
rent working plane. Instead of creating and aligning them to the final position, some-
times it is much faster to define the correct working plane and only then proceed to
create objects. We must not forget that an important part of AutoCAD commands work
only in 2D (the XY plane).
In this chapter, we will cover:
• The world coordinate system
• How to create and apply user coordinate systems
• The UCS command
• Creating UCS by moving and orienting the icon
• When and how to apply dynamic coordinate systems
• Coordinate system icons
• Important variables to know
User coordinate systems
We present the world coordinate system as the AutoCAD reference coordinate sys-
tem, and we shall discuss how to create user coordinate systems.
The world coordinate system
The world coordinate system, also known as World or WCS, is the reference coordin-
ate system and it can never be deleted or modified. All user coordinate systems are
based on this one. When we create an object, it will be internally defined to the WCS,
even if it is not the current coordinate system.
The WCS is also the coordinate system used when exporting the 3D project to other
formats.
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