General Properties

The following settings are available:

Name

Specifies the name of the light.

Type (Light Distribution)

Specifies the type of light. Determines the distribution of light from the . The type
of lighting can be changed after the light has been added to the drawings.

• Spotlight – Default value for Spotlight and Freespot lights.
• Point – Default for Pointlight and Targetpoint lights.
• Web – Default for Weblight and Freeweb lights.

On/Off Status

Indicates whether the light is on or off.

Shadows

Indicates if the light is casting a shadow.

NOTE:Starting with AutoCAD 2016-based products, shadows are always rendered no matter the
current status of the Shadows option. This option is maintained for backwards compatibility
with AutoCAD 2015-based products and earlier releases.

Hotspot Angle (Spotlight and Freespot only)

Specifies the angle of the brightest cone of light. Settings can be calculated by using the QuickCalc Calculator.

Falloff Angle (Spotlight and Freespot only)

Specifies the outer extremity of the light, where it meets the darkness.

Intensity Factor

Magnifies the effect of the skylight.

Filter Color

Specifies the secondary color of the light. Represents the color of a physical filter
over the lamp. Default color is white.

When lighting is set to photometric units this represents a secondary color filter
on the light. When lighting is set to generic lighting this represents the total color
of the light.

Plot Glyph

Allows the ability to plot the drawing with the glyphs on.

Photometric

The following settings are available:

Lamp Intensity

Specifies the inherent brightness of the light. Specifies the intensity, flux, or
illuminance of the lamp. Default units are candela.

Displays the Lamp Intensity dialog box, where units can be modified.

Resulting Intensity

Reports the final brightness of the light. This is determined by the product of the
Lamp Intensity and the Intensity factor. This value is calculated in the Lamp Intensity
Dialog box. (Read-only)

Lamp Color

Specifies the inherent color of the light in Kelvin temperature or standard. Displays
the Lamp Color dialog box.

Resulting Color

Reports the final color of the light. This is determined by a combination of the Lamp
Color and the Filter Color. (Read-only)

Photometric Web

The following settings are available for Web and Freeweb lights:

Web File

Specifies the data file describing the intensity distribution of the light.

Web Preview

Displays a 2D slice through goniometric data.

Web Offsets

Under the Web offsets panel, the following settings are available under the Weblight
and Freeweb types of lights:

Rotation X

Specifies a rotational offset of the web about the optical X axis.

Rotation Y

Specifies a rotational offset of the web about the optical Y axis.

Rotation Z

Specifies a rotational offset of the web about the optical Z axis.

Geometry

Under the Geometry panel, the following settings are available:

Position X

Specifies the X coordinate position of the light.

Position Y

Specifies the Y coordinate position of the light.

Position Z

Specifies the Z coordinate position of the light.

Target X

Specifies the X coordinate target position of the light. (Spotlight, Targetpoint,
and Weblight only)

Target Y

Specifies the Y coordinate target position of the light. (Spotlight, Targetpoint,
and Weblight only)

Target Z

Specifies the Z coordinate target position of the light. (Spotlight, Targetpoint,
and Weblight only)

Targeted

Specifies if the light displays a target grip for orienting the light. Disabled is
the default for Freespot, Pointlight, and Freeweb. Enabled is the default for Spotlight,
Targetpoint, and Weblight.

Attenuation

In the real world, the intensity of light diminishes over distance. Objects far from
the light source appear darker than objects near the source. This effect is known
as attenuation. Attenuation is available under standard lighting workflow only.

Under the Attenuation panel the following property settings are available:

Type

Controls how light diminishes over distance. The farther away an object is from a
spotlight, the darker the object appears. Attenuation is also known as decay.

• Inverse Linear (Standard lights only). Sets attenuation to be the inverse of the linear
  distance from the light. For example, at a distance of 2 units, light is half as strong
  as at the point light; at a distance of 4 units, light is one quarter as strong. The
  default value for inverse linear is half the maximum intensity.
• Inverse Square (Photometric lights). Sets attenuation to be the inverse of the square
  of the distance from the light. For example, at a distance of 2 units, light is one
  quarter as strong as at the spotlight; at a distance of 4 units, light is one sixteenth
  as strong.
• None (Standard lights only). Sets no attenuation. Objects far from the point light
  are as bright as objects close to the light.

Use Limits

Specifies whether to use limits. The default is No. (Standard lights only)

Start Limit Offset

Specifies the point where light starts as an offset from the center of the light.
The default is 1. (Standard lights only)

End Limit Offset

Specifies the point where light ends as an offset from the center of the light. No
light is cast beyond this point. (Standard lights only)

Rendered Shadow Details

Under the Rendered Shadow Details panel, the following settings are available:

Type

Specifies the type of shadow cast by the light.

• Soft (shadow map). Sets the type to Soft. This selection activates additional options
  for Map size and Softness.

• Sharp (default). Sets the rendered shadow to sharp.

• Soft (sampled). Sets attenuation to be the inverse of the square of the distance from
  the light. For example, at a distance of 2 units, light is one quarter as strong as
  at the spotlight; at a distance of 4 units, light is one sixteenth as strong.

Map Size

Specifies the size of the shadow map. (Soft shadow map type only)

Softness

Specifies the softness or fuzziness of the shadow-mapped shadow. (Soft shadow map
type only)

Samples

Specifies the number of shadow rays for the light. (Soft sampled type only)

Visible Render

Specifies whether the light shape is actually rendered. The default is No. (Soft sampled
type only)

Shape

Specifies the shape of the lamp bulb. For the Spotlight distribution type selection
under the General panel, options are Rectangle (default) and Disk. For Point and Web
types the options are Linear, Rectangle, Disk, Cylinder and Sphere (default). (Soft
sampled type only)

Length

Specifies spacial dimension of shadow shape for the length of the shadow. (Soft sampled
type only)

Width

Specifies spacial dimension of shape for the width of the shadow. (Soft sampled type
only)

Radius

Specifies spacial radius dimension of the shape selection of disk, cylinder, or sphere.
(Soft sampled type only)