Strange results using vtkClipVolume

[Will Schroeder]

Hi Roberto-

At 11:43 AM 12/3/99 +0100, Roberto Gori wrote:

>I tried with 2.3, 2.4 and the yesterday nightly update. I found some diferrences between nightly update and previous versions:
>it seems that the nightly version works  a little better with respect to  voxel aspect ratio (Delaunay3D problems?).

Good.


>This cases table for tetrahedra from vtkTetra.cxx it is correct?
>
>  static TETRA_CASES tetraCases[] = {
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 0
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 1
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 2
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 3
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 4
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 5
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 6
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 7
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 8
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 9
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 10
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 11
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 12
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 13
>{{  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 14
>{{ 100, 101, 102, 103,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1,  -1}}, // 15
>};

This table is not used. Currently the 3D cells are clipped using an ordered Delaunay triangulation technique. The problem is controlling the face triangulation of 3D cells (clipped or not) so that the triangulation is compatible. The tables are very complex - and may not be workable. Clipping 3D cells is some of the last unfinished business expressed by the vtk API.

Will


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