22-7. 3D Polar Spheroidal Relative Coordinates

Three-dimensional space and 3D Polar Spheroidal Relative Coordinates in AutoCAD

Example tutorial in AutoCAD

  Spheroidal Polar Coordinates Relative in AutCAD
Spheroidal Polar Coordinates Relative to the 3D drawing based on the point at which we are currently defining a distance under angle1 in XY plane from the initial direction of a angle2 is perpendicular to the plane XY.
Command is entered on the form @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). The command is similar to the spheroid-Absolute coordinates with the difference that when you type the command coordinates put the @ sign and the starting point is our current point where we are.

Look at the picture above. To draw a starting point of a line in 3D space using spherical polar coordinates relative it is necessary to specify the command as follows.
  1. - Click on the Isometric button to switch to 3D view (toolbar View)
  2. - To set point T2 is necessary: to position itself at the point T1 and then click on the button LINE
  3. - Type @6<40<23 + Enter time point T2 positioned in 3D space by elements of orders that we have set. So 6 is our distance from the starting point T1, angle1 under which we started - East direction is 40° and angle2 is vertical and is 23°.
What did we do?
We were at the point T1. Using spherical polar coordinates are defined relative to our distance from the T2 to be 6 units at an angle 40° from the X Axis towards the East a diagonal perpendicular to the height angle2 23°.

So the sequence of commands as follows:
We are located at the point T1
Command: _line [LINE button click to draw lines, note that the starting point from T1]
Specify first point: @6<40<23 [set point T2 - the distance between T1 and T2 = 6, angle1 = 40°, angle2 = 23°]

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