General Properties

Under the General panel, the following property 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.

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 Properties

Under the Photometric Properties panel, the following property 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. Activates 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. The button activates 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

Under the Photometric Web panel, the following property settings are available under the Weblight and Freeweb types of 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 property 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. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Rotation Y

Specifies a rotational offset of the web about the optical Y axis. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Rotation Z

Specifies a rotational offset of the web about the optical Z axis. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Geometry

Under the Geometry panel, the following property settings are available:

Position X

Specifies the X coordinate position of the light. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Position Y

Specifies the Y coordinate position of the light. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Position Z

Specifies the Z coordinate position of the light. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Target X (Spotlight, Targetpoint, and Weblight only)

Specifies the X coordinate target position of the light. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Target Y (Spotlight, Targetpoint, and Weblight only)

Specifies the Y coordinate target position of the light. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Target Z (Spotlight, Targetpoint, and Weblight only)

Specifies the Z coordinate target position of the light. Settings can be calculated by using the QuickCalc Calculator or by selecting a point.

Targeted

Specifies if the light displays a target grip for orienting the light. No is the default for Freespot, Pointlight, and Freeweb. Yes 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 (Standard lights only)

Specifies whether to use limits. The default is No.

Start Limit Offset (Standard lights only)

Specifies the point where light starts as an offset from the center of the light. The default is 1.

End Limit Offset (Standard lights only)

Specifies the point where light ends as an offset from the center of the light. No light is cast beyond this point.

Rendered Shadow Details

Under the Rendered Shadow Details panel, the following property 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 (Soft shadow map type only)

Specifies the size of the shadow map.

Softness (Soft shadow map type only)

Specifies the softness or fuzziness of the shadow-mapped shadow.

Samples (Soft sampled type only)

Specifies the number of shadow rays for the light. Settings can be calculated by using the QuickCalc Calculator.

Visible Render (Soft sampled type only)

Specifies whether the light shape is actually rendered. The default is No.

Shape (Soft sampled type only)

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).

Length (Soft sampled type only)

Specifies spacial dimension of shadow shape for the length of the shadow. Settings can be calculated by using the QuickCalc Calculator.

Width (Soft sampled type only)

Specifies spacial dimension of shape for the width of the shadow. Settings can be calculated by using the QuickCalc Calculator.

Radius (Soft sampled type only)

Specifies spacial radius dimension of the shape selection of disk, cylinder, or sphere. Settings can be calculated by using the QuickCalc Calculator.