added solid of revolution

tikz/solid-of-revolution/Makefile

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+SOURCE = solid-of-revolution
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot
+
+gif:
+	pdfcrop $(SOURCE).pdf
+	convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
+	make clean
+
+png:
+	make
+	make svg
+	inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png
+
+transparentGif:
+	convert $(SOURCE).pdf -transparent white result.gif
+	make clean
+
+svg:
+	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
+	pdf2svg $(SOURCE).pdf $(SOURCE).svg
+	# Necessary, as pdf2svg does not always create valid svgs:
+	inkscape $(SOURCE).svg --export-plain-svg=$(SOURCE).svg

tikz/solid-of-revolution/Readme.md

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+Compiled example
+----------------
+![Example](solid-of-revolution.png)

tikz/solid-of-revolution/solid-of-revolution.tex

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+% Author: Marco Miani
+\documentclass[varwidth=true, border=2pt]{standalone}
+
+\usepackage{pgfplots}
+\pgfplotsset{compat=1.9}
+
+\begin{document}
+    \pgfplotsset{
+        colormap={whitered}{
+            color(0cm)=(white);
+            color(1cm)=(orange!75!red)
+        }
+        %colormap={color}{color(0cm)=(white); color(1cm)=(blue)}
+    }
+    \begin{tikzpicture}
+     \begin{axis}[view={60}{30}]
+      \addplot3[surf,
+      samples=50,
+      domain=1:2,y domain=0:2*pi,
+      z buffer=sort]
+      %({(2 + tan(deg(y)))*cos((deg(x)))}, {(2 + cos(x)) * sin(x)}, {x});
+      ({x * cos(deg(y))}, {x * sin(deg(y))}, {1/x});
+     \end{axis}
+    \end{tikzpicture}
+\end{document}