DX does support mixed-cell grids, but only as MultiGrid groups. You're
right, Field objects contain only
one connections component and that has to contain the a single type of
element. Composite Fields are
groups that consist of fields that are of the same element type and,
further, faces on the boundary of the
member Fields match exactly - what you get when you Partition a Field, and
you get C1 continuity across the
boundaries - shaded isosurfaces of composite fields will not show field
boundaries. Multigrids, however, make
no assumptions about boundaries or about element types of the the
constituent fields - they can be overlapping,
unconnected, varying, element types - whatever, as long as they are of the
same (what?) topological class - eg.
surface in 2-space, volume in 3-space... Downside is that you aren't
guaranteed C1 continuity across boundaries -
you may see artifacts at boundaries. Streamlines will work, though.
Greg
Kent Eschenberg
<[EMAIL PROTECTED]> To:
[email protected]
Sent by: cc:
[EMAIL PROTECTED] Subject: Re: [opendx-users]
Mixed cell types
son.ibm.com
04/18/2002 09:49 AM
Please respond to
opendx-users
--On Thursday, April 18, 2002 <[EMAIL PROTECTED]> wrote:
> DX does not support meshes with mixed cell types
I think you're right. See page 193 in "Programmer's Reference" (version 3
release 1 modification 4) where is says "It is an error to attempt adding
one kind of interpolation element to a "connections" component that already
contains a different kind."
Each field can have only one connection component (i.e., cells), and each
can be of only one kind. There is a way to create a group that contains
several fields. The manual referenced above says, however, that all the
fields must have the same type of cells (pages 99, 100).
Kent
- - -
Kent Eschenberg [EMAIL PROTECTED] (412)268-6829
Scientific Visualization Specialist
Pittsburgh Supercomputing Center, CMU, Pittsburgh, PA
