Camera

Access to camera information

These pieces of information are in read-only mode. You cannot use them to modify the actual value (no #declare or #local). The various vectors might have been updated by transform and look_at.

camera_type is a string containing the type of the camera (but not its subtype, so cylinder camera might be ambiguous).
camera_up is the actual up vector of the camera.
camera_right is the actual right vector of the camera.
camera_direction is the actual direction vector of the camera.
camera_location is the actual location of the camera.

In case of scene with multiple cameras, each keyword can be followed by an usual array notation to access the relevant camera. (e.g. camera_up[3] for the fourth camera)

other fisheye camera

fisheye_orthographic for r = F.sin(theta)
fisheye_equisolid_angle for r = F.2.sin(theta/2)
fisheye_stereographic for r = F.2.tan(theta/2)

Stereographic camera (for 3D vision from 2D image)

stereoschema

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
 }

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
```

parallel

cross-eyed

parallaxe is the angle between the eyes's direction:

should normally be of the same sign of distance (for focusing on one target, as predators do)

opposite sign can be used for simulating herbivores's vision

normal value is atan2( half `distance` value, distance to focus along `direction` )

focus point would be in the middle of each image

```
default is 0 
```

parallaxe

omni directional stereo camera

camera 
{ omni_directional_stereo
  distance 1
  location 0
  up y
  right x
  direction z
}

distance provides the distance, along the right axis's direction, between the eyes. The location of the camera is the middle point.

The left eye is on top, and the right eye is of course the lower part.

ods

##Additional camera to map a planet

perspective

position the camera as a satellite above the center point of the map (location)
direction should point (relatively) to the center of the planet (location+direction == center)
aspect ratio of output image should match the expected ratio of the projection, unless you want it otherwise for a stretched result

###aitoff_hammer