function [h_ctx,h_iskl,h_oskl,h_slp] = spm_eeg_inv_checkmeshes(varargin)
% Display tesselated surfaces of cortex, skull and scalp
% FORMAT [h_ctx,h_iskl,h_oskl,h_slp] = spm_eeg_inv_checkmeshes(S)
% S      - input data struct (optional)
%
% h_ctx  - handle to cortex patch
% h_iskl - handle to inner skull patch
% h_oskl - handle to outer skull patch
% h_slp  - handle to scalp patch
%__________________________________________________________________________
% Copyright (C) 2005-2014 Wellcome Trust Centre for Neuroimaging

% Jeremie Mattout
% $Id: spm_eeg_inv_checkmeshes.m 6182 2014-09-18 12:03:18Z guillaume $


%-Initialisation
%--------------------------------------------------------------------------
[D,val] = spm_eeg_inv_check(varargin{:});
try
    %disp(D.inv{val}.mesh);
    mesh  = spm_eeg_inv_transform_mesh(eye(4), D.inv{val}.mesh);
    Mctx  = mesh.tess_ctx;
    Miskl = mesh.tess_iskull;
    Moskl = mesh.tess_oskull;
    Mslp  = mesh.tess_scalp;
catch
    spm('alert!','Please create meshes',mfilename);
    return
end

if spm('CmdLine'), [h_ctx,h_iskl,h_oskl,h_slp] = deal([]); return; end

%-SPM Graphics figure
%--------------------------------------------------------------------------
Fgraph  = spm_figure('GetWin','Graphics'); spm_figure('Clear',Fgraph)

%-Cortex Mesh Display
%--------------------------------------------------------------------------
h_ctx   = patch('vertices',Mctx.vert,'faces',Mctx.face,...
            'EdgeColor','b','FaceColor','b');
hold on

%-Inner-skull Mesh Display
%--------------------------------------------------------------------------
h_iskl  = patch('vertices',Miskl.vert,'faces',Miskl.face,...
            'EdgeColor','r','FaceColor','none');

%-Outer-skull Mesh Display
%--------------------------------------------------------------------------
h_oskl  = patch('vertices',Moskl.vert,'faces',Moskl.face,...
            'EdgeColor',[1 .5 .35],'FaceColor','none');

%-Inner Scalp Mesh Display
%--------------------------------------------------------------------------
h_slp   = patch('vertices',Mslp.vert,'faces',Mslp.face,...
            'EdgeColor',[1 .7 .55],'FaceColor','none');

%-Slices
%--------------------------------------------------------------------------
pls = 0.05:0.2:0.9;
N   = nifti(mesh.sMRI);
d   = size(N.dat);
pls = round(pls.*d(3));
for i=1:numel(pls)
    [x,y,z] = ndgrid(1:d(1),1:d(2),pls(i));
    f1 = N.dat(:,:,pls(i));
    M  = N.mat;
    x1 = M(1,1)*x+M(1,2)*y+M(1,3)*z+M(1,4);
    y1 = M(2,1)*x+M(2,2)*y+M(2,3)*z+M(2,4);
    z1 = M(3,1)*x+M(3,2)*y+M(3,3)*z+M(3,4);

    s  = surf(x1,y1,z1,f1);
    set(s,'EdgeColor','none')
end

%-Fiducials
%--------------------------------------------------------------------------
pnt   = mesh.fid.fid.pnt;
h_fid = plot3(pnt(:,1), pnt(:,2), pnt(:,3), '.c', 'MarkerSize', 30);
h_fid_txt = text(pnt(:,1), pnt(:,2), pnt(:,3), mesh.fid.fid.label);

axis image off;
colormap('gray');
view(-135,45);
rotate3d on
drawnow
hold off