Generic 3D plotter v1.0
Billy Geerhart

Here are the keys used for this program:

AT THE PLOT SELECT SCREEN:
F1=switch to surface plot
F2=switch to line plot
F4=choose highlighted plot
F8=about screen
ENTER=edit current plot comment and var source
ESC=goto graph screen
2nd+esc=QUIT=quit the program
diamond+E=WINDOW=edit current window
diamond+R=GRAPH=goto graph screen

AT THE GRAPH SCREEN:
F1=goto surface plot select screen
F2=goto line plot select screen
F3=apply hidden surface algorithm(surface plot only)
F4=regraph the plot with DrawClipLine, lines look much cleaner
   You can also hold down F4 and rotate the graph at the same time.
ESC=goto plot select screen
2nd+ESC=QUIT=quit the program
2nd+APPS=SWITCH=switch graph screen to other plot(surface<--->line)
UP,DOWN,LEFT,RIGHT=rotate screen in given direction
HAND+LEFT,HAND+RIGHT=rotate clockwise or counter-clockwise
diamond+E=WINDOW=edit current window
diamond+W="Y="=goto plot select screen

AT THE WINDOW EDIT SCREEN:
You will be prompted for xmin,xmax,ymin,ymax,zmin,zmax.
You can enter any expression, however it must be able to be
approximated by a single real number(i.e sqrt(2) is acceptabe, but
sqrt(-2) is not).  ymax-ymin<512 and zmax-zmin<512 or overflow will
occur and your graph will look messed up.  You can use the normalize
option to make ymax-ymin=zmax-zmin=xmax-xmin=30, and the data points
will be scaled to the new window.

Enclosed are a few basic programs to help make surface and line data.

A program to create 3d parametric line data:
lined(tmin,tmax,num,fx,fy,fz)
fx,fy, and fz are functions of t.
num=number of points that will be calculated from tmin to tmax.
The line data will be stored in the variable m.

A program to create 3d parametric surface data:
para(tmin,tmax,thetamin,thetamax,numt,numtheta,fx,fy,fz)
fx,fy, and fz are two variable function of t and theta.
numt=number of grid points in the t direction
numtheta=number of grid points in the theta direction
The surface data will be stored in the variables datax,datay, and
dataz.


Questions, comments, rants about the program crashing your calc?
Send them here:
   geerhart@orst.edu
Check the web at http://members.aol.com/edwardsbgm1/calcprogs.htm
to see minor bug fixes that will never make it to ticalc.org.


g3dplot v1.0  
First public release.  The hidden surface algorithm isn't a complete
hidden surface algorithm.  Now that winter break is over I don't have
time to make a real hidden surface algorithm.  There may be a few bugs
I missed so please send me the matrix data you used, and details of 
what happened before the bug appeared.