CGAL users discussion list

["Bo Schwarzstein" <>]

Hi Sebastian, you are right, the bug is the index, I have successfully subdivide the mesh, but I do want to know how to deal with the texture cooridinates, anybody who can help me ? Thanks very much.

From:

Sent: Wednesday, July 30, 2008 11:17 AM

To:

Subject: Re: [cgal-discuss] Catmull Clark Subdivide

Note that indexing for OBJ files begins at 1, not zero.  If you're having a memory error.

On Tue, Jul 29, 2008 at 8:04 PM, Bo Schwarzstein <> wrote:

Hi, thanks for your reply.

 

I foundt the MESH demo made by CGAL developers and researchers, modifyed some code so it can be compiled in VS2005.

 

I found that it can't reading the wavefront obj file I exported from Maya 2008, I checked the ascii file but found no problem. It always shows memory access error. I checked the source code, do not know whether it was caused by my mesh - triangles and quads.

 

Because the polygon mesh maybe not perfect, owns some self intersections, so I also want to know whether CGAL CC could handle it.

 

Thanks !

 

From:

Sent: Wednesday, July 30, 2008 2:07 AM

To:

Subject: Re: [cgal-discuss] Catmull Clark Subdivide

Bo Schwarzstein wrote:

    I want to know what's the different about Catmull Clark subdivide surface algorithm between the CGAL and the paper from CalTech named " Rapid Evaluation of Catmull-Clark Subdivision Surfaces", anybody could help me ?

The CGAL CC code takes a mesh and modifies it to a new mesh which corresponds to 1 step of CC subdivision. It does so uniformly. A certain version of the CC rules is used.

The rapid evaluation code is based on pre-evaluated (in a texture map) basis functions which are composed (using texture scale/add) at runtime using the original coarsest level control points as weights. No meshes are produced.

peter

--
Sebastian Marino
Chief Software Architect
Makani Power, Inc., Alameda, Ca.
www.makanipower.com
510.387.8077