"jansb000" <jan### [at] wxsnl> wrote in message
news:3b1b5c3e$1@news.povray.org...
>
> When viewing at the plane from different angles, and even when viewing
from
> the cockpit and other windows, I want a realistic ground surface.
> I currently use a plane for this, but was wondering if it would be better
to
> use a large sphere. The problem with a sphere is that it is difficult (for
> me) to position the airplane correctly. While the airplane moves, it would
> be necessary to constantly change the camera UP vector.

One way would be to rotate the sphere beneath the airplane instead.

Rotating the camera will work, just a little trickier if you need it to
turn.  Just try this out in animation to test.

#declare Rx=360*clock;
#declare E=1000;

camera {location <0,E,0> look_at <0,E,1> rotate x*Rx}
light_source {<1,10000,1000>,1}
plane {y,-1111 pigment {rgb 1} finish {ambient .2}}
sphere {0,E-10 pigment {checker color rgb 1 color rgb 0 scale 10}
 finish {ambient .3}}

Bob H.

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