Hello Bill H. and the VisAD list,
i have (yet) another question about the int[][] Pol_f_Vert
array.
> You mean '9 index entries per vertex'. The Pol_f_Vert array
> contains lists of polygons adjacent to each vertex, and the
> Vert_f_Pol array contains lists of vertices forming each
> polygon.
> In 'int[] Pol_f_Vert' the information for the i-th vertex is
> in Pol_f_Vert[9*i], Pol_f_Vert[9*i+1], ..., Pol_f_Vert[9*i+8].
> The number of polygons adjacent to vertex i is Pol_f_Vert[9*i+8],
> and the indices of those polygons are in Pol_f_Vert[9*i], ...,
> Pol_f_Vert[9*i + Pol_f_Vert[9*i+8] - 1].
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.
-cheers, bob
PS Thanks to Bill H. for answering my last question(s).
Robert S Laramee tel: (603) 868-1361
9 Woodman Ave, #316 office: (603) 862-0350
Durham, NH 03828 URL: http://www.cs.unh.edu/~rlaramee
