22-6. 3D Polar Spheroidal Absolute Coordinates

Three-dimensional Space and 3D Polar Spheroidal Absolute Coordinates in AutoCAD

Start point of draw LINE in AutoCAD

 Spheroidal Absolute Polar Coordinates
Spheroidal Absolute Polar Coordinates in the 3D drawing based on the Origin of the UCS are defined under angle1 distance in XY plane from the initial direction of a angle2 is perpendicular to the plane XY.
Command is set in a distance<angle1<angle2 behind the command line you want to draw.

Given that here we do not have X and Y coordinates, we have a standard starting direction EAST so we take care of it when working with these coordinates. (See Coordinate System)

Look at the picture above. To draw a starting point of a line in 3D space using Spherical Polar Coordinates Absolute must specify the command as follows.
  1. - Click on the Isometric button to switch to 3D view (toolbar View)
  2. - To set the point T1 is needed: a click of a button LINE
  3. - Type 10<40<23 + Enter time point T1 positioned in 3D space by elements of orders that we have set. So 10 is our distance from the starting point (UCS's) angle1 under which we started - East direction is 40° and angle2 is vertical and is 23°.
What did we do?
We were in the UCS. Using Spherical Polar Coordinates Absolute we determine our distance from T1 to be 10 units at an angle 40° from the axis X towards the East a diagonal perpendicular to the height angle2 => 23°.

So the sequence of commands as follows:

Command: _line [LINE button click to draw lines, note that the starting point of the UCS-a]
Specify first point: 10<40<23 [set up the first point T1 - distance = 10, angle1 = 40° angle2 = 23°]

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