Apply different glyphs witihin one vtk source

Hi,

I load some VTK data as

``` python
plot=tools.pipeline.open(vtk_file)
```

and then apply the glyph module to it:

``` python
tools.pipeline.glyph(plot, scale_factor=0.95, mode='cube')
```

I would like each glyph to have a different color and/or transparency value. Is that possible this way? The glyph call applies to the whole VTK source object, doesn't it? Would I need to split the VTK data into several sources?

Thanks,

nick