Basic Setup | Advanced Options | Projections

The Attitude Sphere

The Attitude Sphere is a visualization aid that can be selected to appear in the 3D Graphics and 3D Attitude Graphics windows. It is a powerful tool for displaying an object's attitude and for tracking attitude changes over time. This is especially true when combined with vector display, as in the illustration below.

To define and display an attitude sphere for an object, open an object's 3D Graphics properties and select the Attitude Sphere page. Options and parameters on this page are described below.

Basic setup

Check the Show box to display an attitude sphere and activate the parameters on the page. You can then set the following parameters:

Parameter Description
Sphere Color Select the color for the sphere's grid lines .
Zero Deg Color Select the color for the sphere's equator and prime meridian.
Spacing Select the initial spacing, in degrees, between grid lines.
Min Spacing Specify the minimum spacing, in degrees, to maintain between grid lines when the Attitude Sphere increases in size due to zooming in or resizing of the window.
Max Spacing Specify the maximum spacing, in degrees, to allow between grid lines when the Attitude Sphere decreases in size due to zooming out or resizing of the window.
Label Type You have the option to display latitude/longitude values on all grid lines, on every other grid line, or on none of them.
Label Color If latitude/longitude labels display, select the color in which they are to display.
Font Size If latitude/longitude labels display, select the font size in which they are to display.
Zero Deg Line Width Select the width of the equator and prime meridian lines.
Grid Line Width Select the width of the grid lines.
Frame Click Select... and choose a coordinate frame for the Attitude Sphere.
Scale Enter a logarithmic scaling factor for the sphere, or use the slider to select one.
Scale Relative to Model Select this option to have the sphere's size determined relative to the scale set on the Model page. The sphere's size will automatically adjust with changes in the model scale.
Show Transparent Lines Select this option to have new grid lines fade in gradually when the sphere is resized.

Advanced options

Click Advanced on the Attitude Sphere page to access the following parameters:

Parameter Description
Pixel Threshold Specify the resolution, in pixels, to apply in determining whether to add or remove grid lines as the sphere increases or decreases in size.
Label Point Size Enter a number to specify the size of points appearing next to grid line labels.
Fade Level Enter a percent value or use the slider to specify the extent to which grid lines fade as a function of their distance from the viewer.

Projections

You can project the position of central bodies and other objects of interest onto the Attitude Sphere. Select the object of interest in the Projections list and set the options described in the table below.

A sensor's projections on the Attitude Sphere of its parent object does not take into account any translation offsets from the center of the parent object.

Option Description
Name The name of the selected object.
Show Select this option to display a projection of the selected object.
Label Select this option to display a label identifying the projected object.
Color Select the color in which the projection is to display.

For a planet or star object, the projection color is the same as the color of the object.

Width Select the width of the line with which the projection is to be drawn.
Volume Select this option to display the projection in three dimensions.
Point Size If the projected object is a star, enter a number to specify the size of the point representing it.