Re: Earth texture mapping

Dan I had the same problem with
you
I used
[eX,eMap]=imread('myimage');
and then i tested the map with
warp(eX,eMap) and everything was inverted

It worked for me with
warp(fliplr(flipud(eX)),eMap)

Dan wrote:


Scott wrote:


Dan wrote:


Hi everybody!
I'm trying to execute a texture mapping of the earth with a
NASA
image, but i've got a problem. After I've created the
sphere
[X,Y,Z]=sphere(50) and loaded the image with
img=imread('filename.ext'), i do the texture mapping with
the
command
warp(X,Y,Z,img), but the figure has wrong axes. I mean, the
X
and
the
Y axes are rotated by 90 degrees clockwise with respect to
matlab
axes of the figure(that is the Greenwhich meridien has a
longitude
of
90° E instead of 0°). I tried to solve the problem
inverting
the
axes
with the YDir and XDir command, but it has been useless
because
I
have other data (the orbit) correctly plotted in the same
figure
and
in the right axes of the figure, so inverting the axes
ruins
the
plot
of the orbit.

Any suggestion to solve this problem? I believe it's a
matter
of
reference frame of the figure itself, so my idea is to
rotate
the
image with respect to the sphere along the longitude
direction,
but
i
haven't the faintest idea on how to do this: the command
imrotate,
infact, rotates the image about an axis orthogonal to the
plane
of
the figure and this is not the case.

Thank you all for any suggestion.

Dan,

I think the commands flipud and fliplr might be helpful to you.
You
can just manipulate the img matrix prior to surfacing the
sphere
so
your orbit stuff will remain unaltered.

hth,
Scott


Hi Scott
Thank you for your early replay. I've already tried the flipud and
fliplr commands, but they don't solve the problem, because they
have
a similar effect to imrotate: i've been just able to make the
northern hemisphere the southern one, and the western hemisphere
the
eastern one.
Now i'm trying to drift the image directly over the sphere or to
define a new origine for the image, but i've still no solution for
the problem.

Thank you very much for your help.

Dan
.

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