How can I plot a 3D rectangle and use hgtransform?

I would like to plot a 3D rectangle, then transform it using hgtransform and plot the result. I have been able to do this with a cylinder, but haven't been able to use a rectangle.

Here is what I used to draw the original cylinder:

[cylX, cylY, cylZ] = cylinder(0.5);
hgTransformArray = surface(cylX, cylY, cylZ);
hgTransform = hgtransform('Parent', graphAxes);
set(hgTransformArray, 'Parent', hgTransform);
drawnow;

What can I used in place of the cylinder function to get a 3D rectangle? Thanks, any help is appreciated!

Answer 1

[Matt J]

Something like the following perhaps

    N=10;
    [X,Y,Z]=ndgrid(linspace(-1,1,N));
    idx=abs(X)<1 & abs(Y)<1 & abs(Z)<1;
    X(idx)=[]; Y(idx)=[]; Z(idx)=[];

    hgTransformArray=scatter3(X(:),Y(:),Z(:));

    axis([-1.5 1.5 -1.5 1.5 -1.5 1.5])

    hgTransform = hgtransform('Parent', gca);
    set(hgTransformArray, 'Parent', hgTransform);
    drawnow;

You could also use the following to rotate the X,Y,Z data

http://www.mathworks.com/matlabcentral/fileexchange/30864-3d-rotation-about-shifted-axis

With this, the data doesn't need to be plotted in order to be rotated/transformed

[keagan]

Hello guys

I have a question related to hough transform for detecting a square.

With regards to line detection for a square, using hough transform, I have detected the lines of the square but I need your help with something. How do I say in matlab code that the 2 lines on the rows is perpedicular and the lines on the columns also are and also to say the angles are 90 degrees at the edges to make it a square.

please advice thanks