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From: Michael <proximum@land.ru>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Plotting pressure in 3d
Date: Thu, 23 Jan 2014 02:09:34 +0700
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22.01.2014 16:11, marco.campe@gmail.com пишет:
> Hi all,
>
> I'm trying to do the following using gnuplot:
>
> I have a file that contains the 3d data (x,y,z columns) of a geometry (basically a pipe).
>
> In another file, I have to whole pressure distribution for each point p(x,y,z). In order to visualize the pressure in this geometry, I want to plot both the geometry and the pressure in one graph (anything like that http://journal.fluid-power.net/journal/issue6/number8.jpg for instance).
>
> Can somebody help me out here?
>
> Thank you!
>

Hello,

I tried to plot 2d data over the surface with filledcurves, but it seems 
that gnuplot can't do it. So here is another solution with polygons:


set term png enh size 1024,1024
set out 'pipe.png'
set nokey
set style fill solid 1.0
set size ratio 0.8
set pm3d at b interpolate 100,100
set view map
set grid x
set grid y
set grid mxtics
set grid mytics
set object 1 polygon from 30,0 to 30,30 to 80,30 to 85,35 to 85,100 to 
130,100 to 130,0 to 30,0 front
set object 1 polygon fc rgb "white" fillstyle solid 1.0 border rgb "black"
set object 2 polygon from 30,0 to 30,50 to 60,50 to 65,55 to 65,100 to 
30,100 to 30,0 front
set object 2 polygon fc rgb "white" fillstyle solid 1.0 border rgb "black"
splot [30:130][0:100] 'surface.dat' with pm3d notitle

Here is resulting picture:
http://s006.radikal.ru/i214/1401/33/f3ab113a6d99.png


It's an awkward solution, but if you will have enough points on the 
curved area, it would look pretty smoothly.

Best regards,
Michael.