colorize

PolyGraph.colorize(scalars, items, interpolate_scalars=False)

Colorize polygonal data.

Colorize by assinging vertex colors or face colors. Vertex colors are interpolated across faces. Colors can be specified directly as RGB intensity triples or via a color map that maps scalar values to colors (see lookuptable() for details on the mapping).

Parameters:

  • scalars (array_like) – Scalar values.

  • items (str) – Either ‘verts’ or ‘cells’.

Note

Use the colorbar() function to display a visual representation of the lookup table used for color mapping.

Examples

Apply colors to the vertices of the unit cube \([0, 1]^3\). Since vertex coordinates range between 0 and 1 we use them directly as RGB color specification.

1import m3sh.vis as vis
2
3box = vis.box([0., 0., 0.], [1., 1., 1.])
4box.edges()
5box.colorize(box.points, 'verts')
6
7vis.show()

Color the cube by \(z\)-coordinate value. Not the difference when interpolating scalars before mapping them to colors.

1import m3sh.vis as vis
2
3box = vis.box([0., 0., 0.], [1., 1., 1.])
4box.edges()
5box.colorize(box.points[:, 2], 'verts', interpolate_scalars=True)
6
7vis.colorbar(box)
8vis.show()

To map colors to faces we have to specify a scalar for each of the six faces of the cube. Note that the interpolate_scalars argument has no effect when mapping colors to faces.

1import m3sh.vis as vis
2
3box = vis.box([0., 0., 0.], [1., 1., 1.])
4box.edges()
5box.colorize([.0, .2, .4, .6, .8, 1.], 'cells')
6
7vis.colorbar(box)
8vis.show()