On Thu, Sep 30, 2010 at 16:00, Geoffrey Irving <[email protected]> wrote: > On Fri, Oct 1, 2010 at 9:38 AM, Robert Kern <[email protected]> wrote: >> On Thu, Sep 30, 2010 at 15:30, Geoffrey Irving <[email protected]> wrote: >>> Hello, >>> >>> I'm not sure where the correct place to ask questions about Mayavi, so >>> feel free to redirect me elsewhere. >> >> https://mail.enthought.com/mailman/listinfo/enthought-dev >> >>> I have a triangle mesh with a bunch of data on each face. The only >>> color-relevant argument to triangular_mesh I know about is scalars, >>> which is one value per vertex. Is there a way to set color per >>> triangle, ideally with control over rgb separately so I can visualize >>> three different fields at once? >> >> Pretty difficult, unfortunately. The only way I have found is to >> assign UV texture coordinates to the vertices and slap on a texture. >> Assigning the UV coordinates is usually not easy. > > Is this a limitation in VTK, TVTK, or the Mayavi python code? The VTK > documentation seems to imply it supports cell data on polygon meshes > (though I don't know how one would set them): > > http://www.vtk.org/doc/release/5.6/html/a01445.html > "Point and cell attribute values (e.g., scalars, vectors, etc.) > also are represented" > > I'm happy to hack TVTK or Mayavi (in order of happiness) to support > cell data if VTK supports it.
It's a VTK restriction. You can store whatever data you like on the on the vertices or cells. There is no mapper (that I am aware of) that takes that data and interprets them as RGB values on a per-vertex or per-cell basis. There are mappers that turn scalar vertex and cell attribute values into colors through a colormap table, but that's not what you are asking for. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco _______________________________________________ NumPy-Discussion mailing list [email protected] http://mail.scipy.org/mailman/listinfo/numpy-discussion
