Format 3D plot and draw vertical lines



Hi everyone,

It seems that I am at a loss...

I want to draw a 3D graphic with the whole box around it (there are 3 axes missing) and then I want to draw straight lines from the midpoint of the point to the axes and the grid respectively. 
So, I want to get a line that begins at 0.6 z-axis and ends at the midpoint of the first point. Then I want another line, that starts at 5 at the y-axis and 26 at the x-axis and ends in the midpoint of the first point.
Then I want another axis, beginning at (x=18,y=5), another beginning at (x=18,y=-3) and the last one beginning at (x=26,y=5).

I think that the first point depends on the axis-options I don't find in the help. For the second I've no idea at all...


Here is the code I'm talking about:

<ml>draw3d(color = grey, point_size = 3, point_type = 7, points([[21, 0, .2]]), color<nl>  = red, point_size = 3, point_type = 7, points([[18, -3, .2]]),color = green, point_size<nl>  = 3, point_type = 7, points([[26,5,.6]]),grid=true,axis_3d=true)

Can anybody help and did anyone understand what I want :-) ??????

Thx
______________________________

Thomas Schwander

MVV Energie
Konzern-Risikocontrolling

Telefon 0621 - 290-3115
Telefax 0621 - 290-3664

E-Mail: Thomas.Schwander at mvv.de .  Internet: www.mvv.de
MVV Energie AG . Luisenring 49 . 68159 Mannheim
Handelsregister-Nr. HRB 1780, Amtsgericht Mannheim
Vorsitzender des Aufsichtsrates: Herr Dr. Peter Kurz
Vorstand: Dr. Rudolf Schulten (Vorsitzender) .  Matthias Br?ckmann . Dr. Werner Dub . Hans-J?rgen Farrenkopf