Argthtjtr

I'm trying to represent 3 points in a 3D Cartesian plane. I can do the Cartesian plane but I can not make the grid and color the parts of the plan in yellow, orange and blue. Can you help me?

documentclass{standalone}

usepackage{tikz}

begin{document}



begin{tikzpicture}[x=1pt, y=1pt, z=-0.5pt]  % Agh

% Let's draw some 3D axes

coordinate (x) at (100,0,0);

coordinate (y) at (0,100,0);

coordinate (z) at (0,0,100);

foreach axis in {x,y,z}

draw[-latex] (0,0,0) -- (axis);



end{tikzpicture}



end{document}

This should get you started

documentclass{article}

usepackage{tikz}

usetikzlibrary{3d}

usetikzlibrary{calc}



begin{document}



 begin{tikzpicture} [x={(-0.6cm,-0.4cm)}, y={(1cm,0cm)}, z={(0cm,1cm)}, scale=1]

   begin{scope}[canvas is zy plane at x=0]

     fill[blue, opacity = 0.2] (0, 0) rectangle (6, 6);

     draw[gray!40] (0, 0) grid (6, 6);

   end{scope}



   begin{scope}[canvas is zx plane at y=0]

     fill[orange, opacity = 0.2] (0, 0) rectangle (6, 8);

     draw[gray!40] (0, 0) grid (6, 8);

     draw[black, -latex] (0, 0) -- (6.5, 0) node[left] {$z$};



     draw[gray, -latex] (0, 0) -- (-3.5, 0);

     foreach z in {1,...,6} draw (z, -0.1) -- (z, 0.1) node[left]{z};

     foreach z in {-3,...,-1} draw[gray] (z, -0.1) -- (z, 0.1) node[left]{z};



   end{scope}



   begin{scope}[canvas is yx plane at z=0]

     fill[yellow, opacity = 0.2] (0, 0) rectangle (6, 8);

     draw[gray!40] (0, 0) grid (6, 8);



     draw[black, -latex] (0, 0) -- (6.5, 0) node[above] {$y$};

     draw[black, -latex] (0, 0) -- (0, 8.5) node[above] {$x$};



     draw[gray, -latex] (0, 0) -- (0, -8.5);

     foreach x in {0,...,8} draw (-0.1, x) -- (0.1, x) node[right]{x};

     foreach x in {-8,...,-1} draw[gray] (-0.1, x) -- (0.1, x) node[right]{x};



     draw[gray, -latex] (0, 0) -- (-4.5, 0);

     foreach y in {1,...,6} draw (y, -0.1) -- (y, 0.1) node[below]{y};

     foreach y in {-4,...,-1} draw[gray] (y, -0.1) -- (y, 0.1) node[below]{-y};

   end{scope}



   fill[black] (2, 4, 3) circle (0.05) node[above]{$P$};

   draw[red, thick] (0, 4, 0) -- (2, 4, 0);

   draw[blue, thick] (2, 4, 0) -- (2, 4, 3);

   draw[green, thick] (2, 0, 0) -- (2, 4, 0);



 end{tikzpicture}

end{document}