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% steamcamera.mp
% L. Nobre G.
% 2006
input featpost3Dplus2D;
verbatimtex
\documentclass{article}
\usepackage{palatino,mathpazo}
\begin{document}
etex
Spread := 50;
f := (3,5,2);
beginfig(0);
numeric slabthick, camethick, blocthick, blochange;
numeric slabside, cameside, blocside;
color slabpos, camepos, blocpos;
numeric markmargin;
color lowonbloc, lowonmark, lowonextr;
color higonbloc, higonmark, higonextr;
color newlevelcenter;
slabthick = 0.07;
camethick = 0.7;
blocthick = 0.6;
slabside = 1.2;
cameside = 0.9;
blocside = 0.7;
blochange = 0.25;
markmargin = 0.04;
slabpos = black;
camepos = -0.5*(slabthick+camethick)*blue;
blocpos = 0.5*slabthick*blue;
lowonbloc = blocpos+(0,0.5*blocside,blocthick-blochange);
higonbloc = blocpos+(0,0.5*blocside,blocthick);
lowonmark = blocpos+(-0.5*slabside,0.5*blocside,blocthick-blochange);
higonmark = blocpos+(-0.5*slabside,0.5*blocside,blocthick);
lowonextr = lowonmark - markmargin*red;
higonextr = higonmark - markmargin*red;
kindofcube( false, false, camepos, 0, 0, 0, cameside, cameside, camethick );
kindofcube( false, false, slabpos, 0, 0, 0, slabside, slabside, slabthick );
rigorousdisc( 0, true, blocpos, 0.5*blocside, blocthick*blue );
newlevelcenter = (blocthick-blochange+0.5*slabthick)*blue;
draw
spatialhalfcircle( newlevelcenter, blue, 0.5*blocside, true )
dashed evenly;
draw rp(lowonbloc)--rp(lowonextr);
draw rp(higonbloc)--rp(higonextr);
drawdblarrow rp(lowonmark)--rp(higonmark);
label.rt( btex $\Delta y$ etex, rp(0.5[lowonmark,higonmark]) );
endfig;
verbatimtex
\end{document}
etex
end.
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