Re: transparent surfaces

[Tatsuro MATSUOKA]

----- Original Message -----
>From: "fibonacci4
>To: help-octave
>Date: 2017/3/29, Wed 16:18
>Subject: transparent surfaces
> 
>
>I asked this question on stackoverflow, since there I can show the plots:
><http://stackoverflow.com/questions/43064837/octave-transparent-surfaces-how>
>
>I try to plot transparent surfaces in Octave using facealpha set to 0.2. Ok, I 
>have read that this is not implemented, but if I run this code, I get a plot 
>with a transparent plane.
>close all;
clf reset;
cla reset;
graphics_toolkit("gnuplot");
colormap(bone(64));
a1=-1;b=1;h1=0.01;# making a mesh
x=a1:h1:b; x2=a1:h1:b; nz2=length(x2);
[X1,Y1]=meshgrid(x2,x2);
Z1=zeros(nz2,nz2); # function equal to zero on the mesh
s1=mesh(X1,Y1,Z1); view([120 40]);
# properties of the faces and edges 
set(s1,'edgecolor','none')
set(s1,'facecolor','black')
set(s1,'facealpha',0.05)
hold on
scatter3([-0.5 0],[-0.5 0],[0.5 -0.5],8,'k','.');# two points one above and one 
below the plane 
# print to eps 
print -deps testsurface.eps  

Doing this a plot pops up, where the plane is transparent; but the result of 
the print command gives a non-transparent
plane, the point below it cannot be seen.
I tried it with fltk, same result, with qt no plane at all. I would like to 
print it with the print command, since there are many options, size etc.
Any ideas? Thanks
Karl 
>
On gnuplot, postscript terminal does not support transparent surface.
Thus 
print -deps testsurface.eps

on octave does not give a transparent surface.


If your gnuplot supports cairo based terminal, try

print -depscairo testsurface.eps


Tatsuro