Add the ability to calculate <Camera> element parameters from a <LookAt> element

[GoogleCodeExporter]

Given a <LookAt> element, determine the location of the camera.  

Original issue reported on code.google.com by [email protected] on 30 Aug 2011 at 9:10

[GoogleCodeExporter]

an initial attempt, which may be helpful to build from...

#def get_camera_location(lat1,lon1,altitude1,heading1,range1):
#    "Determines the Camera location given LookAt parameters"
#    
#    #ref: http://en.wikipedia.org/wiki/Mercator_projection
#    # N - Northing
#    # E - Easting
#    # lambda - longitude
#    # phi - latitude
#    # R - radius = 6378137m
#    
#    # TODO: implement
##    # spherical mercator equations
#     #E = R (lambda - lambda0)
#     #    N = R ln tan(pi / 4 + phi / 2)
##
##    # reverse spherical mercator
##    lambda = E / R + lambda0
##   phi - pi/2 - 2*arctan(exp(-N/R))
#    
#    return lat2,lon2,alt2

Original comment by [email protected] on 30 Aug 2011 at 9:10