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    1 \chapter{BUILDING A SET OF COORDINATE AXES}
    2 
    3 \begin{figure}
    4 \centering \includegraphics{axis-3525.ps}
    5 \caption{The Model Axes Viewed from 35,25.}
    6 \label{axis-3525}
    7 \end{figure}
    8 
    9 \begin{figure}
   10 \centering \includegraphics{rmit-3525}
   11 \caption{Example Axes Viewed form 35,25.}
   12 \label{rmit-3525}
   13 \end{figure}
   14 
   15 MGED does not display a set of XYZ co-ordinate axes on the
   16 screen.
   17 When you are in the 35,25 (isometric) viewing state the axes are
   18 positioned as in Figure \ref{axis-3525}.
   19 This database can be found in db/axis.g.
   20 
   21 If you would like a set of coordinate axes to assist in model building,
   22 the easiest thing to do is to
   23 construct three axes using "rcc" cylinder primitives via the "in" command;
   24 
   25 \noindent{\tt
   26 mged> {\em in x rcc 0 0 0  50 0 0  1} \\
   27 mged> {\em in y rcc 0 0 0  0 100 0  1} \\
   28 mged> {\em in z rcc 0 0 0  0 0 150  1} \\
   29 mged>
   30 }
   31 
   32 with the short leg as the "x" axis, next longer leg the "y" axis and longest
   33 leg the "z" axis,
   34 as in Figure \ref{rmit-3525}.
   35 Now, at any stage through construction of the model,
   36 the 'solid' or 'object illuminate' mode can be used
   37 to identify which axis cylinder is going where; they
   38 will have the solid names of "x", "y", and "z".
   39 The name of the solid will also be
   40 displayed in the top left hand corner of the graphics window
   41 and at the bottom of this window.
   42 
   43 Before going on to create a model, construct the three axes cylinders
   44 with the "in" commands mentioned above.
   45 Select the "button menu" in the
   46 upper left corner of the graphics window
   47 to enable the button menu, and
   48 select 35, 25 from this menu.
   49 Your axis will be displayed as shown in Figure \ref{rmit-3525}.