Thread Subject: Plot an image and rotate it in 3d?

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

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

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

"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-

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