High!

To implement a LOD (level of detail) system for large surface textures 
of planets in my Solar System model, I started with testing the FOV 
width in POV units corresponding to camera distance and angle.

As the horizontal image width (in POV units) as 
camera_distance*tan(angle/2), a sphere with a radius of 3396.2 units 
(the planet Mars) should exactly fit into the camera window when viewed 
from a distance of 9330.982812 units - but instead the planet's disc is 
still too large for the image (see attachment)! Obviously, "angle 40" 
does not give really a 40-degree FOV, but a somewhat narrower one... or 
what else did I get wrong?

See you on www.khyberspace.de!

Yadgar

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Download '2009-05-03 mars, take 3.jpg' (102 KB)

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