SoEnvironment

InventorModule

genre	InventorNodesAutomatic
author	Silicon Graphics Inc
package	MeVisLab/Standard
definition	inventor.def

Purpose

This node describes global environmental attributes such as ambient lighting, light attenuation, and fog.

Ambient lighting is the amount of extra light impinging on each surface point when the lighting model is Phong (see SoLightModel).

Light attenuation affects all subsequent lights in a scene (see SoLight). It is a quadratic function of distance from a light source to a surface point. The three coefficients are specified in the attenuation field. Attenuation works only for light sources with a fixed location, such as point and spot lights.

Fog has one of four types, each of which blends each surface point with the specified fog color. Each type interprets the visibility field to be the distance at which fog totally obscures objects. A visibility value of 0 (the default) causes the SoEnvironment node to set up fog so that the visibility is the distance to the far clipping plane of the current camera.

Note that this node has effect only during rendering, and that it does not inherit field values from other SoEnvironment nodes.

Windows

Default Panel

Output Fields

self

name: self, type: SoNode

Parameter Fields

Field Index

Ambient Color: Color

Ambient Intensity: Float

Attenuation: Vector3

Fog Color: Color

Fog Type: Enum

Fog Visibility: Float

Visible Fields

Ambient Intensity

name: ambientIntensity, type: Float, default: 0.2

Intensity of ambient lighting (for Phong lighting).

Ambient Color

name: ambientColor, type: Color, default: 1 1 1

RGB color of ambient lighting (for Phong lighting).

Attenuation

name: attenuation, type: Vector3, default: 0 0 1

Squared, linear, and constant light attenuation coefficients (in that order) with respect to distance of light from surface (for Phong lighting).

Fog Type

name: fogType, type: Enum, default: NONE

Choose fog type.

Values:

Title	Name	Description
None	NONE	No fog.
Haze	HAZE	Linear increase in opacity with distance.
Fog	FOG	Exponential increase in opacity.
Smoke	SMOKE	Exponential squared increase in opacity.

Fog Color

name: fogColor, type: Color, default: 1 1 1

Color of fog.

Fog Visibility

name: fogVisibility, type: Float, default: 0

Visibility distance, which is the distance at which fog totally obscures objects.