On Fri, Oct 1, 2010 at 10:18 AM, Robert Kern <[email protected]> wrote: > 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.
Visualizing a signle cell scalar field is still quite useful (the data doesn't correspond to color). In other words, the per-cell part of the question is more important than than the RGB part. Is there a current way to set a cell attribute value on a Mayavi triangular_mesh? Thanks, Geoffrey _______________________________________________ NumPy-Discussion mailing list [email protected] http://mail.scipy.org/mailman/listinfo/numpy-discussion
