Re: [OctDev] convhulln options.

[Rafael L. <rla...@us...>]

* Pedro Tarrafeta <pt...@te...> [2003-12-18 11:05]:

> This is what Qt is supposed to do. QJ also does it although using some other 
> method (joggling vertices until only simplicial facets are found). Anyway Qt 
> option is not working under octave. Is it just my case?

I also noticed that Qt is not working and I have no clue about where the
problem is.  I will try to investigate further when I will have some time.

> I think so. 
> In fact. Maybe we should use convhulln for matlab compatibility if this is an 
> issue. Some of the important info that I think should be accesible from 
> octave is stored in qh struct in qhull. What I mean is:
> 	- A polyhedron is just an ordered list of facets.
> 	- A facet should contain:
> 		- id number
> 		- normals and offset (hyperplane supporting the facet)
> 		- area
> 		- set of vertices (n if simplicial, >n if non-simplicial)
> 		- set of neighbours (again n  if simplicial...). Here's the need for the id.
> 		- set of ridges. (?)
> 
> I don't know how difficult this is but it looks like in the same 
> FORALLfacets{} loop  the above can be retrieved and written to octave.

This means a total redesign of the qhull functions and facilities for
Octave, with the old API (delaunay, convhull, and voronoi) being wrappers to
them.  I would like to see this happening.  Could someone make a complete
design proposal?

-- 
Rafael