plot,3d,gnuplot,surface,scatter3d , Gnuplot 3D - plot scatter points and a surface *and* lines between the them

## Question:

Tag: plot,3d,gnuplot,surface,scatter3d

I've been unable to find a way of producing the plot described in the title, does anyone know how to do this if it's possible? I'd like to plot a surface from a function, and plot points from a file, and have lines drawn between the points and the surface. The link below is an image that contains an example of what I'd like to do, taken from a stackoverflow question for an identical task (but for a different plotting program).

You can do the calculations inside gnuplot's `using` statement. For the lines I use the `vectors` plotting style, and with `arrowstyle variable` (or `linecolor variable`) you can select different colors depending on the `dz` value:

``````set style arrow 1 linecolor rgb 'red' nohead
set style arrow 2 linecolor rgb 'green' nohead

splot f(x,y) with lines, \
'points.dat' using 1:2:(f(\$1,\$2)):(0):(0):(dz=\$3-f(\$1,\$2)):(dz < 0 ? 1 : 2) with vectors arrowstyle variable,\
'' using 1:2:3 with points pt 7 ps 5
``````

I'm not sure, which this gives problems with gnuplot 4.6. For your case you can also use `linecolor variable` or `linecolor rgb variable` to change the color of the vertical lines:

``````splot f(x,y) with lines, \
'points.dat' using 1:2:(f(\$1,\$2)):(0):(0):(dz=\$3-f(\$1,\$2)):(dz < 0 ? 0xff0000 : 0x00ff00) with vectors nohead linecolor rgb variable lw 5,\
'' using 1:2:3 with points pt 7 ps 5
``````

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