Distortion camera

Description

Cornell box rendered with a distortion camera

This instrument is a rectilinear lens camera model, with optical aberrations. It provides similar images than the Ideal rectilinear camera, with spherical lens imperfections. If the distortion table is set to 0, it will provide the same image than the ideal rectilinear camera model.

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
pixelfilter	list	The ray pixel filter
shutter	real	Shutter time or exposure, in seconds
wlmin	real	Low bound of simulation wavelength range
wlmax	real	High bound of simulation wavelength range
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
focallength	real	The lens focal length in meters. Must be greater than 0
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
lensshift_x	real	The sensor shift in horizontal direction. From 0 to 10 (in sensor length unit). WARNING, reset optical axis perpendicular to your object by reseting z coordinate of forwards direction.
lensshift_y	real	The sensor shift in vertical direction. From 0 to 10 (in sensor length unit).
distortion	table	The tabulated distribution of angular distortion. The first column is the angle of view (in degrees) and should be ordered. The second column is the distortion needs to be applied. The distortion values are decimal values and their range is between -1 and 1.

Ocean XML 5.0 example

<instrument type="distortioncam" name="distortioncam">
        <prm xresolution="512"/>
        <prm yresolution="512"/>
        <prm shutter="0.8"/>
        <prm wlmin="3.8e-07"/>
        <prm wlmax="7.8e-07"/>
        <prm pixelfilter="bilinear"/>
        <prm pos="0.278 0.273   -0.8"/>
        <prm forwards="0        0       1"/>
        <prm up="0      1       0"/>
        <prm focusdistance="2"/>
        <prm autofocus="true"/>
        <prm fnumber="5.6"/>
        <prm focallength="0.03"/>
        <prm sensor_ar="1"/>
        <prm sensor_width="0.025"/>
        <prm sensor_shift_x="0"/>
        <prm sensor_shift_y="0"/>
        <param name="distortion" type="list">
                <row angle="0" value="0"/>
                <row angle="0.5" value="-3e-06"/>
                <row angle="1" value="-1e-05"/>
        </param>
        <sensor type="ciexyz" name="sensor" y_only="false"/>
        <output type="rgbimage" name="output">
                <prm colorspace="srgb"/>
                <prm depth="8"/>
                <prm xwhite="0.3127"/>
                <prm ywhite="0.329"/>
                <prm hcc="0.4"/>
                <prm drawinfo="false"/>
                <filter type="reinhardglobal" name="filter2" enabled="true" stops="1" strength="0.8"/>
                <filter type="noisekiller" name="filter3" enabled="true" method="fuser" strength="4"/>
        </output>
</instrument>