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[I've been away from the newsgroups for a long time; this is my first post in
quite awhile!]
I'm not a 'student' of perspective in drawing (although I like to sketch a lot),
but I would say that POV's regular perspective camera, in and of itself,
produces the kind of views you're looking for.
The 'perspective' camera doesn't introduce any curvilinear distortions, the way
a real camera lens would. (I think that's because it's essentially a 'pinhole
camera'.)
To my mind, the number of vanishing points in a scene seems to depend on the
camera's viewpoint (and maybe the particular subject matter in the scene?) Maybe
that's a VERY obvious statement, ha. If the camera is looking 'straight
ahead'--and all of the scene objects' surface planes are parallel or
orthogonal(?) to the camera plane-- then it looks like "1-point perspective" to
me. (That's my naive analysis, anyway.)
Here's a really simple scene to experiment with. The appearence of the rotated
cube looks like... 2-point perspective?
-------
#version 3.7;
global_settings {assumed_gamma 1.0}
default{finish{ambient 1 diffuse 0}}
camera {
perspective
location <1.7, 2.9, -4.2> // experiment with these settings
look_at <1.7, 2.9, 0>
right x*image_width/image_height
angle 80 // a very wide-angle view, just to show the results
}
background{rgb .1}
plane{y,0
no_shadow
pigment{
checker
rgb <1,0,0>
rgb 0
scale 4
}
}
box{0,2
pigment{checker scale .25}
rotate 45*y
translate 1.5*x
}
difference{
box{0,5 translate <-2.5,0,-2.5>}
box{0,4.5 translate <-2.25,.25,-3.0>}
pigment{
average
pigment_map{
[1 gradient z
frequency 2
color_map{
[.5 rgb .1]
[.5 rgb 1]
}
]
[1 gradient y
frequency 2
color_map{
[.5 rgb .1]
[.5 rgb 1]
}
]
}
translate -.001
}
translate <1,0,3>
}
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