[Scilab-users] 3D animated plot

[grivet]

Dear all,

I have been doing 2D animated plots using the following code (abbreviated):

     plot(xt(1:1), yt(1:1));
     he = gce();
     for j=1:nt
         drawlater();
         he.children(1).data = [xt(1:j); yt(1:j)]';
         drawnow();
   end

Now, I would like to do the same in 3D, so that I write (example 
modified from
Scilab help)

param3d(sin(t(1:2)),cos(t(1:2)),t(1:2)/10,35,45,"X at Y@Z");
he=gce();
for j = 1:npt
     drawlater();
     he.children(1).data = [sin(t(1:j));cos(t(1:j)); t(1:j)]';
     drawnow();
end;

I had to plot a segment (t(1:2)) because param3d will not accept a 
single point
as in the first code fragment.
The he.children(1).data assignment is not accepted,
  with error message "function not defined for given arguments".

Is there a way to generalize the 2D code ?
Thanks in advance for your time and help.
JP Grivet