两个处理三角网格文件（三维）的matlab工具箱

matlab工具箱，处理三角网格格式的三维物体。三角网格格式是指存储了物体的顶点和三角面片的顶点索引；工具箱包括读取，平滑，计算距离等等很多基本的函数，对于初学者非常有用。

function Ic = adjacency2incidence（A）

% adjacency2incidence - convert an adjacency matrix to an incidence matrix
%
%   Ic = adjacency2incidence（A）;
%
%   A（ij） = 1 iff （ij） is an edge of the graph.
%   For each edge number k of the graph linking （ij）
%       Ic（ik）=1 and Ic（jk）=-1 
%
%   Ic is a sparse matrix.
%   Ic is also known as the graph gradient.
%
%   Copyright （c） 2006 Gabriel Peyre

%% compute list of edges
[ijs] = find（sparse（A））;
I = find（i<=j）;
i = i（I）;
j = j（I）;
% number of edges
n = length（i）;
% number of vertices
nverts = size（A1）;

%% build sparse matrix
s = [ones（n1）; -ones（n1）];
is = [（1:n）‘; （1:n）‘];
js = [i（:）; j（:）];
Ic = sparse（isjssnnverts）;
Ic = Ic‘;

% fix self-linking problem （0）
a = find（i==j）;
if not（isempty（a））
    for t=a‘
        Ic（i（t）t） = 1;
    end
end

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2013-07-17 09:52  toolbox-graph-master\
     文件          16  2013-07-17 09:52  toolbox-graph-master\.gitignore
     文件         815  2013-07-17 09:52  toolbox-graph-master\adjacency2incidence.m
     文件         511  2013-07-17 09:52  toolbox-graph-master\adjmatrix2list.m
     文件         208  2013-07-17 09:52  toolbox-graph-master\batch_levelsets_meshes.m
     文件         798  2013-07-17 09:52  toolbox-graph-master\build_euclidean_weight_matrix.m
     文件        1791  2013-07-17 09:52  toolbox-graph-master\build_graph_from_image.m
     文件        5660  2013-07-17 09:52  toolbox-graph-master\bunny.gim.jpg
     文件         669  2013-07-17 09:52  toolbox-graph-master\check_face_vertex.m
     文件        1423  2013-07-17 09:52  toolbox-graph-master\check_incircle.m
     文件        1633  2013-07-17 09:52  toolbox-graph-master\check_incircle_edge.m
     文件         139  2013-07-17 09:52  toolbox-graph-master\compile_mex.m
     文件        1847  2013-07-17 09:52  toolbox-graph-master\compute_boundary.m
     文件         909  2013-07-17 09:52  toolbox-graph-master\compute_combinatorial_laplacian.m
     文件        4161  2013-07-17 09:52  toolbox-graph-master\compute_curvature.m
     文件         287  2013-07-17 09:52  toolbox-graph-master\compute_delaunay.m
     文件        1611  2013-07-17 09:52  toolbox-graph-master\compute_diffusion_geometry.m
     文件         929  2013-07-17 09:52  toolbox-graph-master\compute_diffusion_kernel.m
     文件         971  2013-07-17 09:52  toolbox-graph-master\compute_distance_graph.m
     文件        1103  2013-07-17 09:52  toolbox-graph-master\compute_dual_graph.m
     文件         826  2013-07-17 09:52  toolbox-graph-master\compute_edge_face_ring.m
     文件         770  2013-07-17 09:52  toolbox-graph-master\compute_edges.m
     文件        1946  2013-07-17 09:52  toolbox-graph-master\compute_face_ring.m
     文件        5583  2013-07-17 09:52  toolbox-graph-master\compute_geometric_laplacian.m
     文件        2434  2013-07-17 09:52  toolbox-graph-master\compute_laplacian_curve.m
     文件        1065  2013-07-17 09:52  toolbox-graph-master\compute_levelset_mesh.m
     文件        1052  2013-07-17 09:52  toolbox-graph-master\compute_mesh_gradient.m
     文件        1300  2013-07-17 09:52  toolbox-graph-master\compute_mesh_laplacian.m
     文件        2163  2013-07-17 09:52  toolbox-graph-master\compute_mesh_local_covariance.m
     文件        2783  2013-07-17 09:52  toolbox-graph-master\compute_mesh_weight.m
     文件        1436  2013-07-17 09:52  toolbox-graph-master\compute_normal.m
............此处省略176个文件信息