Feature Lighting

Description

The feature lighting panel is part of the feature properties dialog box. It is used to define the lighting properties of features.
The amounts of ambient, diffuse and specular lighting are relative to each other.
GeoVisage uses a single directional light source located at the camera position and pointing away from the viewer. Parts of features not directly illuminated by this light will be in shadow and may only be illuminated by the ambient lighting.

Ambient

The Ambient sub-panel defines the relative amount of ambient lighting for the features.
Ambient light is background, non-directional light.
The percentage amount of ambient lighting, between 0 and 100%, can be selected using the slider or by entering the value directly into the text box.

Diffuse

The Diffuse sub-panel defines the relative amount of diffuse lighting for the features.
Diffuse light is the directional light reflected from matt surfaces.
The percentage amount of diffuse lighting, between 0 and 100%, can be selected using the slider or by entering the value directly into the text box.

Specular

The Specular sub-panel defines the relative amount of specular lighting for the features.
Specular light is the directional light reflected from shiny surfaces.
The percentage amount of specular lighting, between 0 and 100%, can be selected using the slider or by entering the value directly into the text box.

Specular power

The Specular power sub-panel defines the amount of specular power for the features.
Specular power represents how shiny the surfaces of features are when using specular lighting.
The percentage amount of specular power, between 0 and 100%, can be selected using the slider or by entering the value directly into the text box.

Shading

The Shading sub-panel defines how feature are shaded.

Flat

Each cell in the image of each feature is assigned a single colour.

Gouraud

A higher quality, smoother, but slower shading method.

Phong

The highest quality, but slowest shading method.

Reset

Clicking the Reset button will reset the lighting settings back to their default values.

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