Thanks Samuel,
%nan works with surf, not with plot3d. The latter is attractive because it can handle polygons - but unfortunately not those with embayments: Facet coloring exeeds the contour (Vers. 5.5.2) I have to assemble my facet with several windos from partially overlapping rectangles

Cheers
Jens

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Am 01.10.2018 08:28, schrieb Samuel Gougeon:
Hello Jens,

%nan are often used to do so: As soon as at least one coordinate of a vertex is equal to %nan, the vertex and all lines and facets going through it are skipped/not rendered.

HTH
Samuel


Le 30/09/2018 à 23:35, Jens Simon Strom a écrit :
Hallo Scilab friends,
Is there a way to punch a*peak through* hole into a rectangle?

The result below looks like a hole but it is just white intransparent color.
xdel();
xf=[1;-1;-1;1]; yf=[1;1;-1;-1]; zf=[0;0;0;0]; plot3d(xf,yf,list(zf,5))//Facet
   ce=gce();  ce.hiddencolor  =  5;
xf=0.5*[1;-1;-1;1];  yf=0.5*[1;1;-1;-1];  zf=[0;0;0;0];
plot3d(xf,yf,list(zf,8))//Hole
   ce=gce();  ce.hiddencolor  =  8;

Cheers

Jens


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