Thread Subject: Display an image in a 3d plot

I was looking to make a demo of perspective projection, so I would like to move an image along the principal axis of a camera and resize it based on the focal length, and show how a 3d point gets projected along a ray. I saw this thread:

http://www.mathworks.com/matlabcentral/newsreader/view_thread/155794

But it uses pcolor - so it would have to be a data set like 'clown', not an actual image. Is there no way to show something that you might show with imshow() but on a specific plane in 3d?

Thanks,
Dave

David Doria wrote:

> Is there no way to show something that you might show with imshow() but on a specific plane in 3d?

No. image objects cannot have Z components.

Try this instead:

surf(Z*ones(size(TheImage)),TheImage,'EdgeColor','none')

where Z is the constant Z that you want for the image.

You can also make a surface with a texture-mapped image:

surface('XData',[0 1; 0 1],'YData',[0 0; 1 1],...
        'ZData',[1 1; 1 1],'CData',flipdim(imageData,1),...
        'FaceColor','texturemap','EdgeColor','none');

where imageData is the image you want to display. You would just adjust the 'ZData' property of the surface to move it.

Ken

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With the first method:

Z=5;
I = imread('ImagePlane.jpg');
surf(Z*ones(size(I)), I,'EdgeColor','none')

I get
Warning: Matrix dimensions must agree, not rendering mesh

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Ken, perfect - that looks exactly like what I was looking for - I'll mess with it more and report back.

Dave