Tweak 3D projection paper

docs/3d-projection.tex

@@ -7,7 +7,7 @@
 \def\minZ{-2} \def\maxZ{6}
 \def\screenZ{2}
 \def\eyeZ{0} \def\eyeY{0}
-\def\pZ{4} \def\pY{1}
+\def\pZ{3} \def\pY{1}
 \begin{tikzpicture}
   \draw[-stealth] (\minZ,0) -- (\maxZ,0) node[above]{$z$};
   \draw[-stealth] (0,\minY) -- (0,\maxY) node[above]{$x$};