Ananduri,
On Fri, Jun 15, 2012 at 8:47 AM, ananduri <arun.nand...@gmail.com> wrote:
>
> Hello,
>
> I have some minor questions regarding matplotlib. I'm using it to make a 3d
> plot, displaying a surface, it's contour map, a line climbing the surface
> and its projection onto the contour map.
>
> http://old.nabble.com/file/p34015720/landscape_draft.pnglandscape_draft.png
>
> As you can see, when the lines cross the contourf, they are somewhat
> obscured. Before I made the contourf transparent, the lines were blocked,
> even though they were above the contour plot when I viewed the picture from
> a different angle. Can this be fixed? I want the lines to appear on top of
> the contour plot.
>
>
Unfortunately, no. Matplotlib was originally designed as a 2D layering
renderer. The mplot3d toolkit tries to work within that framework, but in
the end, each artist object has to be represented by a single 3rd dimension
coordinate (the layer), and so when two artists share bounding box regions,
physically incorrect results will happen. Please see this FAQ:
http://matplotlib.sourceforge.net/mpl_toolkits/mplot3d/faq.html#my-3d-plot-doesn-t-look-right-at-certain-viewing-angles
> Also, I am trying to extend the z axis to be lower. This is most of the
> code
> I'm using:
>
> fig=plt.figure(1)
> ax=fig.gca(projection='3d')
>
> x=np.arange(0,2.5,.02)
> y=np.arange(0,2.3,.02)
> x,y=np.meshgrid(x,y)
>
> ax.plot_surface(x,y,Z(x,y),alpha=0.3)
>
> cset=ax.contourf(x,y,Z(x,y),zdir='z',offset=-2,
> cmap=plt.cm.jet,levels=np.linspace(0,9,100),alpha=0.5)
>
> ax.set_xlabel('x')
> ax.set_ylabel('y')
>
> ax.set_zlim(-2,8) #This is where I try to change the z axis limits.
>
> plt.show()
>
> I'm excluding the code which plots the lines. ax.set_zlim doesn't do
> anything; why is this?
>
That would depend on which version of matplotlib you are using. The v1.1.x
branch should have that working properly.
Cheers!
Ben Root
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