User:Le Forgeron/cameras
- Everything about HgPovray38 in User:Le_Forgeron/HgPovray38
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Camera
You knew orthographic, ultra_wide_angle, spherical, omnimax, fisheye, perspective and others, here a few new kinds.
The recommendation about the ratio is for the the final picture's dimensions, assuming square pixels.
Put the location above the intended center, in orbit. The location+direction should provide the center of the planet.
aitoff_hammer
Recommended ratio is 2:1
eckert_iv
Recommended ratio is 2:1
eckert_vi
Recommended ratio is 2:1
lambert_azimuthal
Recommended ratio is 1:1
mercator
Recommended ratio is up to you, as you need a very large height/wide to hope reaching the poles (nah, it's impossible with that projection).
miller_cylindrical
Recommended ratio is 1.3638862 or 1:0.733
mollweide
Recommended ratio is 2:1
plate_carree
Recommended ratio is 2:1
van_der_grinten
Recommended ratio is 1:1
Cylindrical Equal Area Projection
formula for ratio is π.cos²(φ) with φ the standard parallel.
balthasart
Recommended ratio is about 1.3.
The standard parallel of the projection is 50°.
behrmann
Recommended ratio is 3π:4 (about 2.36)
The standard parallel of the projection is 30°.
edwards
Recommended ratio is about 2.
The standard parallel of the projection is 37°24'.
gall
Recommended ratio is π:2 or golden ratio (φ) (both near 1.6).
The standard parallel of the projection is 45°.
hobo_dyer
Recommended ratio is about 2.
The standard parallel of the projection is 37°30'.
lambert_cylindrical
Recommended ratio is π
The standard parallel of the projection is 0°.
peters
Recommended ratio is about π:2 or golden ratio φ (not exactly the same thing, but around 1.6).
The standard parallel of the projection is 44.138°.
smyth_craster
Recommended ratio is about 2.
The standard parallel of the projection is 37°04'.
Unfolding platonic
Of the 5 platonic solids, 4 are easy to unfold to make a map. The dodecahedron is not available so far.
icosa
Recommended ratio is about 2.1169 ( 11.sqrt(3):9 )
octa
Recommended ratio is about 2.3 ( 4:sqrt(3) )
cube
Recommended ratio is 2.5 ( 5:2 )
tetra
Recommended ratio is about 2.886 ( 5:sqrt(3) )
Stereoscopic camera
The right's length is adjusted automatically to take into account that there is two images. Just use the same right you would with a picture of half the width. Or think of it the other way : the view is HxW, the rendering is to be done for a Hx(2W).
camera
{ stereo distance (clock <0 ? -26:26 )
parallaxe atan2(13*clock,300)
location -300*z
right image_width/image_height*x
direction z
up y
angle 15
}
|
| cross-eyed viewing: distance is negative |
|
| Parallel viewing: distance is positive |
|
|
Parallel viewing with 0 parallaxe |
- distance provides the distance, along the right axis's direction, between the eyes. The location of the camera is the middle point.
- use a positive value for parallel viewing
- use a negative value for cross-eyed viewing
- default is 0
- parallaxe is the angle between the eyes's direction:
- should normally be of the same sign of distance
- normal value is atan2( half distance value, distance to focus )
- default is 0
Omni Directional Stereo camera
camera
{ omni_directional_stereo distance 1
location 0
up 10*y
right 10*x
direction 10*z
}
|
| ODS picture |
- distance provides the distance, along the right axis's direction, between the eyes. The location of the camera is the middle point.