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//
// drehung.pov -- Drehung um (1,1,1)
//
// (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
//
#include "common.inc"
#declare n = vnormalize(<1,1,1>);
#declare V = <0,2.6,0>;
#declare W = <0,0,2.6>;
#declare Vparallel = vdot(n, V) * n;
#declare Vperp = V - Vparallel;
#declare Wparallel = vdot(n, W) * n;
#declare Wperp = W - Wparallel;
arrow(<0,0,0>, 2*n, thick, Red)
arrow(<0,0,0>, V, thick, rgb<0.0,1.0,1.0>)
arrow(<0,0,0>, W, thick, rgb<0.0,1.0,1.0>)
circlearrow(vnormalize(vcross(<-1,0,1>,n)), -0.01 * <1,1,1>, <0,0,0>, 1, 0.8*thick, 1.98*pi/3, 3)
arrow(<0,0,0>, Vperp, 0.99*thick, Blue)
arrow(<0,0,0>, Wperp, 0.99*thick, Blue)
arrow(Vperp, V, thick, Green)
arrow(Wperp, W, thick, Green)
#declare l = 2.4;
intersection {
box { <-l,-l,-l>, <l,l,l> }
//cylinder { -n, n, 3 }
plane { n, 0.01 }
plane { -n, 0.01 }
pigment {
color rgbt<0.6,0.6,1.0,0.8>
}
}
#declare e1 = vnormalize(Vperp);
#declare e3 = n;
#declare e2 = vnormalize(vcross(e3, e1));
#declare r = vlength(Vperp);
mesh {
#declare phi = 0;
#declare phimax = 2*pi/3;
#declare phistep = (phimax - phi) / N;
#while (phi < phimax - phistep/2)
triangle {
<0,0,0>,
r * (cos(phi ) * e1 + sin(phi ) * e2),
r * (cos(phi+phistep) * e1 + sin(phi+phistep) * e2)
}
#declare phi = phi + phistep;
#end
pigment {
color rgbt<0.2,0.2,1.0,0.4>
}
}
mesh {
#declare phi = 0;
#declare phimax = 2*pi/3;
#declare phistep = (phimax - phi) / N;
#while (phi < phimax - phistep/2)
triangle {
r * (cos(phi ) * e1 + sin(phi ) * e2),
r * (cos(phi+phistep) * e1 + sin(phi+phistep) * e2),
r * (cos(phi ) * e1 + sin(phi ) * e2) + Vparallel
}
triangle {
r * (cos(phi+phistep) * e1 + sin(phi+phistep) * e2),
r * (cos(phi ) * e1 + sin(phi ) * e2) + Vparallel,
r * (cos(phi+phistep) * e1 + sin(phi+phistep) * e2) + Vparallel
}
#declare phi = phi + phistep;
#end
pigment {
color rgbt<0.2,1,0.2,0.4>
}
}
bogen(r * e1, r * e2, <0,0,0>, 2*pi/3, Blue)
bogen(r * e1, r * e2, Vparallel, 2*pi/3, Green)
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