Fisheye camera

Description

Cornell box rendered with a fisheye camera (Equisolid projection)

This instrument is a camera with a circular fisheye lens, representing a 180° field of view over a circular image.

The following fisheye projections are available:

• Equisolid : \(2*f*sin(\theta/2)\)

• Equidistant : \(f*\theta\)

• Stereographic : \(2*f*tan(\theta/2)\)

• Orthographic : \(f*sin(\theta)\)

The focal length of the lens is automatically calculated to fit the width of the circular image inside the rectangular buffer.

Children Nodes

This node may have a variable number of output children with custom names.

sensor	List of channels defined by a sensitivity spectrum
user-defined	First output preset
user-defined	Second output preset
user-defined	…

Parameters

name	type	description
xresolution	integer	Horizontal buffer resolution
yresolution	integer	Vertical buffer resolution
shutter	real	Shutter time or exposure, in seconds
wlmin	real	Low bound of simulation wavelength range
wlmax	real	High bound of simulation wavelength range
projection	list	The fisheye prohjection, can be equisolid, equidistant, stereographic or orthographic
pixelfilter	list	The ray pixel filter
pos	vec3	The camera position : center of pupils apertures, as well as principal points
forwards	vec3	The camera optical axis, or view direction. Should be orthogonal to up
up	vec3	The camera up axis. Should be orthogonal to forwards
focusdistance	real	The lens focusing distance in meters. Set to zero for infinite focus distance
autofocus	boolean	Set to true for setting the focus distance to the first geometry met in the forward direction
fnumber	real	The lens aperture F-number
sensor_ar	real	The sensor aspect ratio. Physical width/height ratio of the recorded image, but not necessarily equal to pixel aspect ratio (xresolution/yresolution. Must be greater than 0
sensor_width	real	The sensor width in meters, such as 0.036 for 35mm film cameras. Must be greater than 0

Ocean XML 5.0 example

<instrument type="fisheyecam" name="fisheye">
     <prm xresolution="512"/>
     <prm yresolution="512"/>
     <prm shutter="0.8"/>
     <prm wlmin="3.8e-007"/>
     <prm wlmax="7.8e-007"/>
     <prm pixelfilter="bilinear"/>
     <prm projection="equisolid"/>
     <prm pos="0.278 0.273   0"/>
     <prm forwards="0        0       1"/>
     <prm up="0      1       0"/>
     <prm focusdistance="2"/>
     <prm autofocus="true"/>
     <prm fnumber="5.6"/>
     <prm sensor_ar="1"/>
     <prm sensor_width="0.025"/>
     <sensor type="ciexyz" name="sensor" y_only="false"/>
     <output type="rgbimage" name="image">
             <prm colorspace="srgb"/>
             <prm depth="8"/>
             <prm xwhite="0.31271"/>
             <prm ywhite="0.32902"/>
             <prm hcc="0.32"/>
             <prm drawinfo="false"/>
             <filter type="gain" name="filter1" enabled="true" gainev="0"/>
             <filter type="reinhardglobal" name="filter2" enabled="true" stops="1" strength="0.8"/>
     </output>
</instrument>