patchnormals.m File Reference

This function PATCHNORMALS calculates the normals of a triangulated mesh. PATCHNORMALS calls the patchnormal_double.c mex function which first calculates the normals of all faces, and after that calculates the vertice normals from the face normals weighted by the angles of the faces. More...

Functions
function N =	patchnormals (FV)
	This function PATCHNORMALS calculates the normals of a triangulated mesh. PATCHNORMALS calls the patchnormal_double.c mex function which first calculates the normals of all faces, and after that calculates the vertice normals from the face normals weighted by the angles of the faces.

Detailed Description

This function PATCHNORMALS calculates the normals of a triangulated mesh. PATCHNORMALS calls the patchnormal_double.c mex function which first calculates the normals of all faces, and after that calculates the vertice normals from the face normals weighted by the angles of the faces.

Function Documentation

patchnormals()

function N = patchnormals

(

FV

)

This function PATCHNORMALS calculates the normals of a triangulated mesh. PATCHNORMALS calls the patchnormal_double.c mex function which first calculates the normals of all faces, and after that calculates the vertice normals from the face normals weighted by the angles of the faces.

N=patchnormals(FV);

Inputs, FV : A struct containing FV.faces with a facelist Nx3 and FV.vertices with a Nx3 vertices list. Such a structure is created by Matlab Patch function Outputs, N : A Mx3 list with the normals of all vertices

Example, % Compile the c-coded function mex patchnormals_double.c -v

% Load a triangulated mesh of a sphere load sphere;

% Calculate the normals N=patchnormals(FV);

% Show the normals figure, patch(FV,FaceColor,[1 0 0]); axis square; hold on; for i=1:size(N,1); p1=FV.vertices(i,:); p2=FV.vertices(i,:)+10*N(i,:);
plot3([p1(1) p2(1)],[p1(2) p2(2)],[p1(3) p2(3)],g-); end

Function is written by D.Kroon University of Twente (June 2009)

Required fields of FV:

References max, min, N, and patchnormals_double().

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