Re: [Matplotlib-users] Display a scalar as color over a surface

[Byron K. B. <bkb...@be...>]

I just sent a similar question in last week. This is basically the functionality I'm looking for too. In MATLAB this can be done with the trisurf plotting function. Matplotlib has a plot_trisurf method for an axis provided by loading the mplot3d module, but as far as I can tell, you can either give a surface a constant color or you can choose a cmap and have it color the surface according to the Z values of surface points.

If anyone knows of a way to make Philippe's plot with Matplotlib, I'd love to know.

Byron Boulton

From: Philippe Piot [mailto:phi...@gm...] 
Sent: Saturday, January 17, 2015 1:25 PM
To: mat...@li...
Subject: [Matplotlib-users] Display a scalar as color over a surface

> Hello All,
>   I have a scalar function (a potential) defined on a 3-dimensional
> cartesian space V(x,y,z) and an arbitrary surface (a boundary) set by
> the function f(x,y,z)=a. I would like to paint the value of V(x,y,z)
> on the surface defined by f in the (x,y,z) domain.
>   Specifically I was thinking of rewriting f in the form of Z=f(X,Y)
> and plot it with surface plot
>    plot_surface(X, Y, Z, cmap=cm.coolwarm)
> This give me my boundary surface but its color is set by Z while I
> would like if to be set by my other function V evaluated on the
> surface.
>  Please let me know if any of you have a good suggestion. Thank you,
> -- Philippe.