The VRayLightMeter helper allows the user to evaluate how a scene is illuminated at a given time during the day or how it is affected by different light sources. The information can be displayed in the viewport and it can be also saved to a CSV file.
Active - enables or disables the VRayLightMeter helper.
The options in this group allow us to specify the dimensions of the light meter tool and its resolution - the number of points at which the illumination will be measured.
Width - the width of the VRayLightMeter.
Length - the length of the VRayLightMeter.
Width segs - the resolution of the VRayLightMeter in the x direction
Length segs - the resolution of the VRayLightMeter in the y direction.
The settings in this group control the way the illumination information is represented in the view port.
Orientation - enables or disables the preview of the direction from which the light is coming
Viewport text - enables or disables the preview of the actually values of the illumination for each point
Pseudo Colors - when enabled the VRayLightMeter will display a gradient to illustrate the variation in the illumination.
Logarithmic - changes the illumination scale to Logarithmic for the purposes of displaying it in the viewport . This is useful when there is a great variation in the illumination.
Min - specifies the minimum illumination displayed in the viewport in lux.
Max - specifies the maximum illumination displayed in the viewport in lux.
Measured values - specify which part of the illumination in the scene will be measured:
Total illuminance - the total illuminance will be measured - this includes direct light, GI and light coming from the environment.
Direct illuminance - calculates only the illumination from direct lighting.
Indirect illuminance - calculates only the effect of the indirect illumination.
Daylight factor - calculates the illumination coming from the sky.
- hitting this button will calculate the measured values at the grid points of the light meter helper.
- this button allows you to save the result in a .csv file.
The following methods of the VRayLightMeter object are accessible from MaxScript.
VRayLightMeter method Description
Calculates the values along the light meter grid. saveCSV <filename> Saves the values from the grid into the specified text file, in CSV (comma separated values) format