\input{settings.ttt}

\begin{document}
\begin{tikzpicture}[scale=2, line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]

\input{coord-oct.tex}

% Background varying in size depending on the main figure
\fill[color=white] (-1.2,-1.2) rectangle (1.2,1.2);

\filldraw[very thick, draw=my-color-draw-main,
	  fill=my-color-fill-main, fill opacity = 0.4]
	(P4) -- (P2) -- (P0) -- cycle;

\filldraw[very thick, draw=my-color-draw-main,
	  fill=my-color-fill-main, fill opacity = 0.8]
	(P4) -- (P3) -- (P0) -- cycle;

\filldraw[very thick, draw=my-color-draw-main,
	  fill=my-color-fill-main, fill opacity = 0.2]
	(P5) -- (P2) -- (P0) -- cycle;

\filldraw[very thick, draw=my-color-draw-main,
	  fill=my-color-fill-main, fill opacity = 0.6]
	(P5) -- (P3) -- (P0) -- cycle;


\draw[very thick, draw=my-color-draw-main, dashed] (P1) -- (P2);
\draw[very thick, draw=my-color-draw-main, dashed] (P1) -- (P3);
\draw[very thick, draw=my-color-draw-main, dashed] (P1) -- (P4);
\draw[very thick, draw=my-color-draw-main, dashed] (P1) -- (P5);

\end{tikzpicture}
\end{document}