Qimera Shading Parameters Dialog

How to Start

  • Shading Parameters button of Static or Dynamic surface attribute panel
  • Default Surface Shading section of Shared Preferences tab in Application Preferences dialog 

What it Does

This dialog controls shading parameters for surface generation.

General Description

Lighting Direction

The arrow in this box represents the sun direction, which can be rotated to any azimuth from 0 to 360 degrees by clicking and dragging the left mouse button inside the box. The actual angle is displayed in red text near the center of the box. The sphere in the middle of the diagram displays the current direction and length of the cast shadows. Dragging the slider located on the right side of the Shadow Direction box adjusts the length of the shadows (thus sets the height of the sun). In the example shown in the figure the light is coming from the North West (upper left). At the bottom of the area the Effective Sun Angle is listed. This value lists the approximate sun elevation in degrees, where 0 degrees indicates the sun would be at the horizon and 90 degrees would indicate the sun would be directly overhead.

The rest of the parameters are controlled via the following slider controls.

Ambient

This slider controls the amount of ambient or background light in the lighting model. It primarily affects the amount of light that appears in cast shadows. High ambient light makes the entire image brighter and the shadows less distinct.

Specular

This slider controls the amount of glossy highlight that appears. High specular makes the surface appear to be very glossy. Low specular will provide a matte finish.

Soft Shadows

This slider controls how sharp or soft the shadow edges are.

Vertical Scale

The height of the surface can be artificially increased or decreased to change the shadow length. Occasionally this is useful to enhance a low relief surface or reduce a very high relief surface. It is usually better to use the Shadow Direction/Length box to configure and adjust the shadow length.

All of the sliders work in a standard way. To change the position of the slider select and drag it using the left mouse button. To go directly to a specific part of the slider bar click the middle mouse button.

 

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