The RenderableStars class requires a few different data variables in the SPECK file. The mapping between the internal name and the name of the variable in the SPECK file can be specified in the .asset file. The combination of selected rendering parameter determines which values are necessary:

Size Composition Color Option Required Data Value
App Brightness Color luminance
Lum and Size Color bv, luminance, absoluteMagnitude
Lum, Size and App Brightness Color bv, luminance, absoluteMagnitude
Abs Magnitude Color bv, absoluteMagnitude
App Magnitude Color bv, absoluteMagnitude
Distance Modulus Color bv, absoluteMagnitude
App Brightness Velocity luminance, vx, vy, vz
Lum and Size Velocity luminance, absoluteMagnitude, vx, vy, vz
Lum, Size and App Brightness Velocity bv, luminance, absoluteMagnitude, vx, vy, vz
Abs Magnitude Velocity absoluteMagnitude, vx, vy, vz
App Magnitude Velocity absoluteMagnitude, vx, vy, vz
Distance Modulus Velocity absoluteMagnitude, vx, vy, vz
App Brightness Speed luminance, speed
Lum and Size Speed luminance, absoluteMagnitude, speed
Lum, Size and App Brightness Speed bv, luminance, absoluteMagnitude, speed
Abs Magnitude Speed absoluteMagnitude, speed
App Magnitude Speed absoluteMagnitude, speed
Distance Modulus Speed absoluteMagnitude, speed
App Brightness Other Data luminance,
Lum and Size Other Data luminance, absoluteMagnitude,
Lum, Size and App Brightness Other Data bv, luminance, absoluteMagnitude,
Abs Magnitude Other Data absoluteMagnitude,
App Magnitude Other Data absoluteMagnitude,
Distance Modulus Other Data absoluteMagnitude,
App Brightness Fixed Color luminance
Lum and Size Fixed Color luminance, absoluteMagnitude
Lum, Size and App Brightness Fixed Color bv, luminance, absoluteMagnitude
Abs Magnitude Fixed Color absoluteMagnitude
App Magnitude Fixed Color absoluteMagnitude
Distance Modulus Fixed Color absoluteMagnitude

The bold values denote the default value for the stars.asset distributed with OpenSpace