You can always move an arrow after creating it using

draw arrow {0 0 0} {0.1 0.1 0}
set drawpicking true
set picking draw

and then use CTRL- and ALT- to move around the arrow and position it. Grab it at it's point. Arrow size is settable using

set defaultDrawArrowScale

although that's just size, not cone angle.

isosurface function can get you a cone, but that's pretty involved.

2012/2/28 Angel HerrŠez <>
Thanks, Bob
Yes, I had thought of an arrow, but the problem is to position it.
And the diameter.

Well, if that's what we have, I will try to manage.

Alternative: any easy way to generate pmesh data? so I can feed it
into Jmol

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Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
phone: 507-786-3107

If nature does not answer first what we want,
it is better to take what answer we get.

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900