See also EXTRUDE, REVOLVE & Boolean Operations
otherwise, the UCS icon is in the lower left corner of the display and there is no cross in the icon. When the UCS icon is currently displayed at the origin point you will see a small cross inside the UCS icon at this point. for example, you will see this icon in the Right view for the WCS. The UCSICON is a box with a broken pencil if you view your model in a direction parallel to the XY plane of the current UCS. lines that normally cross to form a box in the corner are not displayed from any viewpoint that is under the drawing plane. the Bottom view) you see only the outline of the UCS icon and the appropriate labels. When you view models from underneath (e.g. the letter “W” is not displayed for any other UCS( User Coordinate System). you know it is the WCS when the letter “W” is displayed. When you start New drawings from scratch you see the World Coordinate System (WCS) icon in the following orientation. Spherical format for spherical coordinates is where R is the radius (distance from last point), A is the angle from the X axis and B is the angle from the XY plane. this is the same as relative polar coordinates (used in 2D) with a Z ordinate appended at the end. points are relative to the origin (0,0) of the current UCS unless you enter before typing cylindrical or spherical formats.Ĭylindrical format for relative cylindrical coordinates is where R is the cylinder radius, A is the angle from the X axis and Z is the distance in the Z axis direction. you can use these formats for any model shapes (not just for cylindrical or spherical models). You can also supply points in 3D using a cylindrical or spherical format for coordinates. it is less confusing to change the UCS origin rather than changing the elevation (the default elevation is 0). 
for example, if you change the elevation to 5, the Z ordinate will be 5 when you supply only the X and Y ordinates for a point.You can use the Elev command to change the elevation of the drawing plane relative to the XY plane of the current UCS. when you pick points on screen (without using an osnap) it is the same as typing only X & Y ordinates at the keyboard.įor example, you could draw the 2 LINE objects in 3D as shown below using the command line history shown.Ĭommand: LINE↵ Specify first point: 3,6↵ Specify next point or : 8,6↵ Specify next point or : ↵Ĭommand: LINE↵ Specify first point: 3,6↵ Specify next point or : 8,8,3↵ Specify next point or : ↵.this drawing plane (also called the construction plane or the XY plane) is normally defined by the X and Y axes.
If you do not include Z ordinates when you type coordinates for points, the supplied point is on the drawing plane of the current UCS.
but the relationship of the Z axis to the X and Y axes will always be the same according to the right hand rule. You can view these axes from a different point of view and you can define custom axes at any orientation by default, the X axis points to the right, the Y axis points up and the Z axis points at you when you face your monitor. but you can specify Z ordinates other than zero (when AutoCAD prompts for points) to create objects in 3 dimensions. 
You are normally not concerned with the Z axis and Z ordinates are usually zero when you use AutoCAD for 2D drafting & design
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