[pstricks] "starred" versions of put; arrows

Zbigniew Nitecki zbigniew.nitecki at tufts.edu
Wed Jul 14 02:17:24 CEST 2010

While what you say may be true for some 3d pictures (although "hidden lines" can make even such a picture easier to understand visually),
my need for this has to do with labels:  I have a surface, I mark a specific point on it, and I want to label that point.  Since the label needs
to visually connect to the point, I have two choices:  either I put the label near the point, in which case it may be unreadable if the surface
covers the field of view (in my case, it is a hyperboloid of one sheet) unless I block it out, or I need to place the label away from the point and
connect the label to the point with a line (or perhaps an arrow).
The easiest way to construct the latter kind of connection is a \pstThreeDLine joining the coordinates of the \pstThreeDPut command placing
the label to the coordinates of the point itself.  However, in this case the line starts in the middle of the label, and obscures part of it.  If the label
were in a box of the kind created by \rput* in 2d, then the line would emerge from behind that box, and would look just right.

Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966

On Jul 13, 2010, at 16:31, Hernando Diaz Morales wrote:

> El 13/07/2010 14:32, Zbigniew Nitecki escribió:
>> 1. Is there a "starred" version of \pstThreeDPut, similar in effect to \rput* (that is, it overwrites anything crossing the box being "put")?
>> I know from trying that if so, it isn't \pstThreeDPut*;  tried that and got weird error messages.
>> Lacking that, is there another way to get this effect?
>> 2. Is there a way to attach an arrow to the end of a \pstThreeDLine? (again, putting arrows=-> seems to cause trouble).
> Hello:
> Come to think about it: Does it really make sense to overwrite something in a 3D graph? What for?
> I may be wrong, but it seems to me that overwritting only makes sense in a 2D graph. 
> In 3D, you should be able to see what is being crossed out from the opposite direction.
> I'd like to see your comments.
> Hernando Diaz
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