MATLAB Central Newsreader - Plot an image and rotate it in 3d?

Plot an image and rotate it in 3d?

David Doria — Thu, 27 Sep 2007 13:42:40 -0400

I would like to have a surface in a 3d plot that is an
image, is this possible? For example I want to show a 3d
line passing through a 3d plane and intersecting at a
particular point in an image (like from a camera)

does that make sense?

Thanks,

David

Re: Plot an image and rotate it in 3d?

Randy Poe — Thu, 27 Sep 2007 14:45:38 -0400

On Sep 27, 9:42 am, "David Doria" <daviddo...@gmail.com> wrote:
> I would like to have a surface in a 3d plot that is an
> image, is this possible? For example I want to show a 3d
> line passing through a 3d plane and intersecting at a
> particular point in an image (like from a camera)
>
> does that make sense?
>
> Thanks,
>
> David

Yes. Unfortunately, HELP IMAGE says this.

" The image object will not render at axes View angles other than
    [0 90]. To get a similar effect to rotating an image, use SURF
    with texture mapping or PCOLOR."

So I tried this little experiment:

   h=image;
   figure;g=surf(get(h,'Cdata'))

That turns the image data into Z-data. Rotate it and you'll
see the original image, but with the default color map.
Let's fix the colormap and get rid of the grid lines:

   colormap('gray')
   set(g, 'edgecolor', 'none')

and make the image a lot flatter:
   set(g, 'zdata', get(g, 'zdata') * .001)

Now a test line:
   hold on
   h1=line([0 30],[0 30],[50 -50]);
   set(h1, 'linewidth', 3)
   set(gca,'view',[-60 40])

Not perfect since the image isn't actually a flat
object, but hopefully approximates what you wanted.

             - Randy

Re: Plot an image and rotate it in 3d?

Randy Poe — Thu, 27 Sep 2007 14:47:39 -0400

Re: Plot an image and rotate it in 3d?

Michael Garrity — Fri, 28 Sep 2007 13:48:53 -0400

"Randy Poe" <poespam-trap@yahoo.com> wrote in message news:1190904459.761081.170430@19g2000hsx.googlegroups.com...
> On Sep 27, 9:42 am, "David Doria" <daviddo...@gmail.com> wrote:
>> I would like to have a surface in a 3d plot that is an
>> image, is this possible? For example I want to show a 3d
>> line passing through a 3d plane and intersecting at a
>> particular point in an image (like from a camera)
>>
>> does that make sense?
>>
>
> By the way, I expect the real answer is to do exactly
> what the HELP for IMAGE said, which was to use "SURF
> with texture mapping or PCOLOR". However, I'm not familiar
> with those, so I just did an ordinary surface with height-based
> coloring, which I'm comfortable manipulating.
>
> - Randy
>
It would look something like this:

surface('xdata',[0 1],'ydata',[0 1],'zdata',zeros(2),'cdata',img,'facecolor','texturemap','edgecolor','none')

You'll need to fiddle the X & Y data to match your aspect ratio.

-MPG-

Re: Plot an image and rotate it in 3d?

haidar master — Sat, 04 Jul 2009 07:58:01 -0400

Please, can you help me?

I want to plot any Image in 3-d like Lena.bmp... can you write to me the code in matlab for drow the image in 3-d?

with my best regards