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From: Ingo Thies <ingo.thies@gmx.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Isometric view is distorted
Date: Tue, 21 Feb 2012 21:44:22 +0100
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Am 2012-02-21 19:21, schrieb Yrogirg:
> How do I make 3D view look as it should be? Now when looking from the
> top the square is not a square, but rather a rectangular or diamond
> (and anything between). See the screenshots.

My standard header for isometric splots includes the commands
"set xyplane 0" and "set view equal xyz". Here is a sample script which 
might be what you are looking for:

set term x11 size 800,800 # set a square canvas

## some variables
kzoom=1.2
phi=30.
theta=60.

## Ranges example (10 ist the default range for x,y here):
set xrange [-10:10]
set yrange [-10:10]
set zrange [-10:10]

## the relevant gnuplot commands
set xyplane 0       # removes the offset of the xy plane
set view equal xyz  # force equal units to all three axes
set view theta,phi,kzoom

set iso 100, 100

splot sin(x)*cos(y) with pm3d

The variable kzoom just sets a convenient initial zoom factor for a 
screen-filling plot, and phi,theta are the angles which are dynamically 
varied with the mouse. But in most cases, you can leave it at 1.

There might be some fine-tuning needed for the placement of the 
legend(s), or just unset them by "unset key" and/or "unset colorbox".

This works for gnuplot 4.4 patchlevel 4 (my stable version), but should 
with yours as well.

HTH,

Ingo