Re: [Plib-users] How to paste a satellite image on the top of mesh?

[Steve B. <sjb...@ai...>]

Allen Yang wrote:

> We are working on a 3D product that requires us to use satellite images. 
> We generated a mesh by using plib library. Now we are having problems to 
> paste a satellite image on the top of mesh. Since we never do such thing 
> before, we really come to the dead end. Please give me some hints!!

It all depends on how the satellite image is taken.

Generally, the first step in processing the image is to "Orthorectify" it.
This adjusts the perspective on the image to match that of the mesh you
are using.  Is your mesh modelled to allow for the curvature of the earth?
(Whether that matters or not depends on the area you are covering - for
small areas it doesn't matter too much - but for large areas, the curvature
of the earth cannot be neglected.)

Once you have the satellite image re-mapped, you should be able to simply
take the X/Y coordinate at each vertex on the mesh and divide it by the
size of the image (in meter or whatever).  This maps the entire image
onto the entire mesh.

Ortho-rectification of images is a deep subject that I can't go into
depth on.
---------------------------- Steve Baker -------------------------
HomeEmail: <sjb...@ai...>    WorkEmail: <sj...@li...>
HomePage : http://www.sjbaker.org
Projects : http://plib.sf.net    http://tuxaqfh.sf.net
            http://tuxkart.sf.net http://prettypoly.sf.net