Spotlight

Set the light source location:

Define the point of the light source location.

Set the target location:

Define the point of the target location – the point to which the light flux will be directed.

Enter the name of the modified mode or [Name/Intensity/Status/Photometry/Spot/Falloff/Attenuation/Color/Exit]:

Define the command options, if necessary, otherwise just press Enter.

Name

Name of the light source.

Intensity

Brightness of the light: from 0 to the maximum value supported. By default, is equal to 1.

Status

Status of the light source: turned on/off. The disabled light source stops lighting, and its icon in the work space changes color to bright green.

Photometry

Photometry is the measurement of the luminous intensities of visible light sources.

·         Intensity of light in photometry is the measurement of perceived power emitted by a light source in a particular direction.

·         Flux – perceived power.

·         Illuminance – the general light flux per surface per area unit.

·         Color – color of light given by this source

·         Color name – lamp color name from the list of standard colors.

·         ? – displays the list of color names.

·         Kelvin – Kelvin color temperature value (min:1000 - max:20000).

The option is available only if values 1 or 2 are set for the LIGHTINGUNITS system variable.

Hotspot

Angle of the light beam that defines the size of the inside light cone of the same brightness equal to the value of Intensity parameter. The angle value can be in the range from 0 to 160 degrees (45 by default).

Falloff

Angle that defines the size of external cone of light (full cone of light). Internal and external cones define the area of Falloff, in which brightness from this light source falls from maximum to 0.

The angle can range from 0 to 160 degrees (by default 50). The falloff angle should be greater or equal to the hotspot angle.

Attenuation

Diminishing the light intensity (brightness) over distance from the light source.

Attenuation type:

·         None – sets no attenuation. Objects that are both far and close to the light source are illuminated equally.

·         Inverse linear – sets attenuation value to be the inverse of the linear distance from the light to the object. By default, the intensity at inverse linear is half the maximum intensity.

·         Inverse squared – sets attenuation value to be the inverse of square of the distance from the light to the object.

Use limits – Turns on and off the attenuation limits.

·         Attenuation start limit – specifies the point where light starts as an offset from the center of the light. By default, is determined as 0.

·         Attenuation end limit – specifies the point the light ends as an offset from the center of the light. No light is cast beyond this point.

Impact of this option is not taken into account if the value of LIGHTINGUNITS system variable is different from 0.

Color

Color of light given by this source.

·         R,G,B – colors in accordance with RGB color model.

·         Color index – nanoCAD color index.

·         H,S,L – colors according to HSL color model.

Exit

Exits the command.