quiverVec

Below is a demonstration of the features of the quiverVec function

Syntax
Description
Examples
Example for multidimensional image data: colormap driven vectors
Example for face normal plotting with variable color

clear; close all; clc;

Syntax

|[hp]=quiverVec(P,V,vecSize,colorSpec,edgeColorOpt,quiverStyleOpt,alphaLevel);

Description

This function is a short-hand version of the quiver3Dpatch function which enables colormapped and 3D rendering of directional or vector data. The inputs are: P: The vector origins V: The vectors vecSize: The vector sizes colorSpec: The color data which is a string, rgb values or colormapped arrays edgeColorOpt: Edge coloring of the vector quiverStyleOpt: The quiver style, which is 1=normal arrow, 2=Arrive at origin, 3=Pass through origin, 4=Two-sided. alphaLevel: the transparancy level

Examples

clear; close all; clc;

Plot settings

cMap=viridis(250);
fontSize=15;

Example for multidimensional image data: colormap driven vectors

Simulating 3D volume and vector data

n=15;
[X,Y,Z]=meshgrid(linspace(-4.77,4.77,n));
phi=(1+sqrt(5))/2;
M=2 - (cos(X + phi*Y) + cos(X - phi*Y) + cos(Y + phi*Z) + cos(Y - phi*Z) + cos(Z - phi*X) + cos(Z + phi*X));
[u,v,w] = gradient(M); %Vector components
C=hypot(hypot(u(:),v(:)),w(:)); %Vector lenghts
P=[X(:) Y(:) Z(:)];
V=[u(:) v(:) w(:)];

cFigure;

quiverVec(P,V,C,C);

colormap(cMap); colorbar;
axisGeom(gca,fontSize);
camlight headlight; lighting flat
clim([1 3])
drawnow;

Example for face normal plotting with variable color

See also patchNormPlot

Creating a surface model

[F,V]=geoSphere(2,1);
[N,Vn]=patchNormal(F,V); %Get face normals
Cn=Vn(:,1); %Color data

cFigure;

gpatch(F,V,'w','none');
quiverVec(Vn,N,0.5,Cn);

colormap(cMap); colorbar;
axisGeom(gca,fontSize);
camlight headlight;
drawnow;

GIBBON www.gibboncode.org

Kevin Mattheus Moerman, [email protected]

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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.

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.