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diff --git a/texmf-dist/scripts/ketpic/ketlib/ketpic2escifiles6/Zperspt.sci b/texmf-dist/scripts/ketpic/ketlib/ketpic2escifiles6/Zperspt.sci
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+// 08.08.12
+// 10.01.02
+
+function X3=Zperspt(P)
+
+ global FocusPoint EyePoint
+
+ Tmp=P-FocusPoint;
+ X1=Tmp(1); Y1=Tmp(2); Z1=Tmp(3);
+ Tmp=EyePoint-FocusPoint;
+ E1=Tmp(1); F1=Tmp(2); G1=Tmp(3);
+ Ca=E1/sqrt(E1^2+F1^2);
+ Sa=F1/sqrt(E1^2+F1^2);
+ X2=X1*Ca+Y1*Sa; Y2=-X1*Sa+Y1*Ca; Z2=Z1;
+ E2=E1*Ca+F1*Sa; F2=-E1*Sa+F1*Ca; G2=G1;
+ Cb=E2/sqrt(E2^2+G2^2);
+ Sb=G2/sqrt(E2^2+G2^2);
+ X3=X2*Cb+Z2*Sb;
+endfunction
+