Re: octaviz and color

[Jonathan Stickel]

On 2/11/09 address@hidden wrote:
> Date: Tue, 10 Feb 2009 11:43:57 -0800 (PST)
> From: alberto_gh <address@hidden>
> Subject: Re: octaviz and color
> To: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=us-ascii
>
>
> Hi,
>
> Could you be more specific in how to assign scalar inputs and modifying a
> color scheme please? I have tried to plot only one triangle at each time
> with one color based in my curvature value at each of that triangle's peaks
> but I don't get a good result. Is there any way to do it as if it was a 4d
> plot, where the fourth dimension, represented as a color, takes values from
> a vector?
>
> Thanks very much
>
> Alberto

Unfortunately, octaviz is not currently being maintained.  It will not 
compile with vtk > 5.0.x, and therefore I am no longer able to install 
octaviz on my computer (which is Mac OS X).  I do not have the c++/bison 
knowledge to fix the bugs, and no one else has offered to help.  Also, 
there is a separate effort to provide OpenGL 3d rendering via FLTK to 
Octave; this will likely supersede all projects like Octaviz.

That said, I think your problem may be simple.  The vtk_surf (and other 
similar functions) will take 4 matrix inputs, the last being a set of 
scalar values to use for the colormap:

vtk_surf(x,y,z,c)

To change the colormap that is applied, use the function "vtk_colormap" 
(you can download the m-file from octaviz cvs).  For example:

vtk_colormap (jet(256))

HTH,
Jonathan