Hi Bob,
> In the implementation of the isosurf() method, the construction of the
> Pol_f_Vert[] array is based on the notion that 1 vertex may be shared (or
> adjacent to) by a maximum of 8 polygons. I'm wondering where this result
> is derived from. In other words, why is 8 the maximum number of polygons
> shared by a vertex. The reason I am wondering is because in our own
> implementation of Marching Cubes (taken from the Visualization Toolkit),
> as far as I can tell, I'm getting a result that says a vertex can be
> shared by up to 9 polygons. I seem to be getting this result fairly
> consistently and I don't know, at this writing, whether or not this is a
> valid result.
In our isosurf method, a vertex lies on a cube edge so is adjacent
to at most four cubes, and there can be at most two polygons
adjacent to a vertex from one cube.
I wouldn't worry too much about it. I'd either use our
isosurf as is, or replace it with your own.
By the way, we recently added a new method makeContour()
to ShadowType to make it easier to define new extensions
of DataRenderer with radically different approaches to
contours.
Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
