Creating a Light Field Sensor
This page shows how to create a Light Field Sensor that measures the distribution of light hitting a surface and generates a Light Field file (".olf" file for "optical light field" file) storing light distribution on this selected surface.
Note: The Light Field feature is in BETA mode for the current release.
To create a Light Field Sensor:
-
From the Light Simulation tab, click Light Field
_Sensor_Light_Field.png)
.
The sensor appears in the 3D view and is placed on the origin of the assembly. -
In the 3D view, define the Axis system of the Light Field sensor.
_Axis_System_Definition.png)
- Click
_Origin_Point.png)
to select an origin
point. - Click
_Sensor_Lidar_Horizontal_Direction.png)
to
select a line defining the horizontal direction. - Click
_Sensor_Lidar_Vertical_Direction.png)
to
select a line defining the vertical direction. - or click
_Axis_System_Autofill.png)
and select a coordinate
system to autofill the Axis System.
Note: If you define manually one axis only, the other axis is automatically (and randomly) calculated by Speos in the 3D view. However, the other axis in the Definition panel may not correspond to the axis in the 3D view. Please refer to the axis in the 3D view. - Click
-
In General, from the Type drop-down list:
_Sensor_Light_Field_General.png)
Select Photometric if you want the sensor to consider the visible spectrum and get the results in lm/m2 or lx.
Note: In case of a photometric result generation, the International Commission on Illumination (CIE) defines the visible spectrum as follows: "There are no precise limits for the spectral range of visible radiation since they depend upon the amount of radiant flux reaching the retina and the responsivity of the observer. The lower limit is generally taken between 360 nm and 400 nm and the upper limit between 760 nm and 830 nm".-
Select Radiometric if you want the sensor to consider the entire spectrum and get the results in W/m2.
Note: With both Photometric and Radiometric types, the illuminance levels are displayed with a false color and you cannot make any spectral or color analysis on the results. Select Spectral to store the spectral data according to the wavelength sampling defined (in lx or W/m2).
Note: Spectral results take more time to compute as they contain more information.
-
In the 3D view, click
_Faces_Selection.png)
to select
the oriented faces on which to measure the light distribution.
The selected faces appear in the list as Oriented Faces. -
In Incident angles, define the angular sampling or the angular
resolution.
_Sensor_Light_Field_Incident_Angles.png)
Note: In the 2022 R1 version, the Start and End values are fixed to 0° and 90°. -
In Azimuth angles, define the angular sampling or the angular
resolution.
_Sensor_Light_Field_Azimuth_Angles.png)
Note: In the 2022 R1 version, the Start and End values are fixed to 0° and 360°. -
If you selected Spectral as sensor type, set the spectral excursion to use
for simulation.
_Sensor_Light_Field_Wavelength.png)
- Edit the Start (minimum wavelength) and End (maximum wavelength) values to determine the wavelength range to be considered by the sensor.
-
If needed, in Sampling, adjust the number of wavelengths to be computed during simulation.
Note: The Resolution is automatically computed according to the sampling and wavelength start and end values.