[vtk-developers] Question about DATA_RESOLUTION key

[David Gobbi]

Hi Dave,

I have a question about the way that UPDATE_RESOLUTION and
UPDATE_EXTENT are used with 3D extents.  My intent is to have certain
image filters and mappers request a desired UPDATE_RESOLUTION.
But I'm not sure exactly how this ties in with UPDATE_EXTENT.

For example: let's say that the full-resolution 3D extent is [0, 255,
0, 255, 0, 0] and a mapper wants half-resolution.  Should it request
an UPDATE_RESOLUTION of 0.5 but keep the UPDATE_EXTENT
at [0, 255, 0, 255, 0, 0]?  And would the updated data then have an
extent of [0, 127, 0, 127, 0, 0]?

 - David