\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-tet.tex}

% Background varying in size depending on the main figure
\fill[color=white] (-2,-2) rectangle (2,2);

\filldraw[very thick, draw=my-color-draw-main,
	  fill=my-color-fill-main, fill opacity = 0.3]
	(P0) -- (P1) -- (P2) -- cycle;

\filldraw[very thick, draw=my-color-draw-main,
	  fill=my-color-fill-main, fill opacity = 0.7]
	(P0) -- (P3) -- (P1) -- cycle;

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

\end{tikzpicture}
\end{document}