Real rectilinear camera¶
Description¶
This instrument is a rectilinear lens camera model, with optical aberrations. It provides similar images than the Ideal rectilinear camera, with extra lens imperfections. If aberration parameters are all set to zero, it will provide the same images.
- The supported aberrations are:
- Radial : This mostly controls image distortion (pincushion or barrel)
- Spherical
- Coma
- Curvature
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 |
aradial | real | The radial aberration parameter. It mainly controls lens distortion (negative for pincushion, positive for barrel) |
aspherical | real | The spherical aberration parameter |
acoma | real | The coma aberration parameter |
acurvature | real | The curvature aberration parameter |
Ocean XML 5.0 example¶
<instrument type="realrectcam" name="camera">
<prm xresolution="512"/>
<prm yresolution="512"/>
<prm shutter="0.05"/>
<prm wlmin="3.8e-007"/>
<prm wlmax="7.8e-007"/>
<prm pixelfilter="bilinear"/>
<prm pos="0.337141 -0.698955 0.774228"/>
<prm forwards="-0.309152 0.648172 -0.695915"/>
<prm up="-0.299591 0.628127 0.718124"/>
<prm focusdistance="1.07488"/>
<prm autofocus="true"/>
<prm fnumber="45"/>
<prm focallength="0.05"/>
<prm sensor_ar="1"/>
<prm sensor_width="0.024"/>
<prm aradial="-0.05"/>
<prm aspherical="-0.002"/>
<prm acoma="0.002"/>
<prm acurvature="-0.002"/>
<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>