Re: scenery tiles real photo mapping

Hi,

There's not much documentation for chop.pl and photo.cxx.  This was 
something I did as a demo probably 5-6 years ago and haven't touched 
since.  This approach cuts a hole in the scenery and inserts a photo.

If the area you want to cover is mostly flat (such as an airport) then 
another option would be to simply build your own 3d model of the area 
... this could be as simple as a single rectangular surface with the 
photo applied as a texture.  It's really easy to place 3d objects into 
FlightGear.  We used this approach to model our UAV flying area last 
fall and it worked out quite well.  Check out the movies in the Dec 12, 
2005 section:

http://www.flightgear.org/~curt/Models/Special/Rascal110_2/

If you have to deal with terrain, then you probably do need to figure 
out the chop.pl/photo.cxx code.  This requires getting the rest of 
terragear to work as well (and assembling all the raw data) because you 
need to completely rebuild the tile with this approach.  Last time I 
tried the photo scenery demo, it didn't work, so there may be something 
broke in our code right now.  I couldn't see anything immediately wrong 
when I spent a 1/2 day looking into this, but then I ran out of time and 
haven't had a chance to get back to it.

Curt.


alessandro marassi wrote:

>Thanks to everybody.
>I found another link:
>http://mail.flightgear.org/pipermail/terragear-devel/2004-September/001036.h
>tml
>
>Is there any documentation about FG tiles format and the use of the
>utilities chop.pl and photo.cxx?
>For example, which dimension has a single tile?
>
>chop.pl seems to chop a single image in a number of tiles; it seems to
>require the following parameters:
>
>name of graphic file (image)
>number of tile sides
>number of tile sides
>number of colors?
>
>photo seems to require the following parameters:
>
>location of the file to be generated?
>name of graphic file (image)
>number of tile sides
>number of tile sides
>geographic coordinates of the 4 vertices of the image (degrees.decimal?),
>expressed in longitude and latitude
>
>What does it mean recreate the scenery using fgfs-tool-client/server and add
>PhotoArea and PhotoObj to the client's parameter list?
>
>All single areas (photos) have to be added in the file materials.xml?
>
>Can anyone confirm the procedure or better detail it?
>
>  
>


-- 
Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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