Placing the camera in a particular position is not as simple as it
probably ought to be. I think the reason that scene.mouse.camera is
read-only has to do with synchronizations issues, but I'll admit to
being a bit hazy on this issue.
Here is a way to place the camera at a specific location, in this case
(10,10,10):
from visual import *
box()
d = vector(10,10,10)
scene.forward = -norm(d)
#scene.fov = pi/3 (the default fov)
scene.range = mag(d)*tan(scene.fov/2)
print scene.mouse.camera # not updated yet
print scene.forward
scene.mouse.getclick()
print scene.mouse.camera # now shows <10,10,10>
The key geometrical point is that scene.fov is the angle subtended by
the scene, so the tangent of half of that angle is the range (recall
that range=1 means the scene goes from -1 to +1).
Bruce Sherwood
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