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diff --git a/buch/papers/parzyl/images/Makefile b/buch/papers/parzyl/images/Makefile
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+#
+# Makefile to build 3d images
+#
+# (c) 2022 Prof Dr Andreas Müller
+#
+
+all:	halfplane.pdf
+
+halfplane.pdf:	halfplane.tex halfplane.jpg
+	pdflatex halfplane.tex
+halfplane.png:	halfplane.pov
+	povray +A0.1 -W1920 -H1080 -Ohalfplane.png halfplane.pov
+halfplane.jpg: halfplane.png Makefile
+	convert -extract 1280x1080+340+0 halfplane.png \
+		-density 300 -units PixelsPerInch halfplane.jpg
+