isGlobalSurfDirOutward
Below is a demonstration of the features of the isGlobalSurfDirOutward function
Contents
clear; close all; clc;
Syntax
[L]=isGlobalSurfDirOutward(F,V);
Description
This function returns a boolean denoting wether surface normals are pointing outward (1) (which would result in a positive volume being computed) or inward (2) (which would result in a negative volume being computed). The method assumes that the normal directions are coherent across the surface.
Examples
Example surface
[F,V]=stanford_bunny;
Computing a logic denoting whether the normals point outward or inwards. For the example surface the normals point outward, so the logical should return a true
% This one should be true
[L]=isGlobalSurfDirOutward(F,V)
L = logical 1
However inverting the surface causes the normal directions to point inward, hence a false is returned.
% Reversed should be false
[L]=isGlobalSurfDirOutward(fliplr(F),V)
L = logical 0
cFigure;
gpatch(F,V);
patchNormPlot(F,V);
axisGeom; camlight headlight;
drawnow;
GIBBON www.gibboncode.org
Kevin Mattheus Moerman, [email protected]
GIBBON footer text
License: https://github.com/gibbonCode/GIBBON/blob/master/LICENSE
GIBBON: The Geometry and Image-based Bioengineering add-On. A toolbox for image segmentation, image-based modeling, meshing, and finite element analysis.
Copyright (C) 2006-2023 Kevin Mattheus Moerman and the GIBBON contributors
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.