Shiny-ness

The glinting bright dot on the side of a shiny apple is the pure, un-scattered bounce of the sun from above. Shininess is a material characteristic called 'specularity' in 3D graphics terms; the ability to reflect light en masse with a pure bounce, and not scattering it ("diffusing" it).     

• Select an entity in the space (or in the library, but you'll see your effect if its in the space).
• Undock the Property Editor Panel
• Click on the MeshModel dropdown using the arrow on its left to expand the menu
• Click on Materials
• Select the Underlined Material in the window on the right
• This will bring you to the property editor for the Material currently applied
• Select Specular on the list on the left
• Change the value for the Specular Level under the Specular property on the right side of the panel. The more specular, the more shiny. 
• Shine on! 

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More on specularity: 

Wikipedia: Specularity