LibreOffice lets you define custom colours using a two-dimensional graphic and numerical gradient chart of the Pick a Colour dialogue box.
Press the Colour Dialogue Box button in the Illumination tab of the 3-D Effects dialogue box.
Intensity
Enter the intensity of the specular effect.
Apply
Click here to apply the properties shown in the dialogue box to the selected object.
Apply
Update
Click here to view in the dialogue box all the properties of the selected object.
Update
Preview Field
Displays a preview of the current selection.
Convert to 3-D
Use this icon to convert a selected 2D object to a 3D object. You can also select several 2D objects and convert them to one single 3D object. To convert a group of 2D objects to 3D, you must first ungroup the selected objects.
Convert to 3-D
Convert to Rotation Object
Click here to convert a selected 2D object to a 3D rotation object. You can also select several 2D objects and convert them to one single 3D rotation object. To convert a group of 2D objects to 3D, you must first ungroup the selected objects.
Convert to Rotation Object
Perspective On/Off
Click here to turn the perspective view on or off.