| RGBAMode | Graphics.UI.GLUT.Initialization, Graphics.UI.GLUT |
| RGBMode | Graphics.UI.GLUT.Initialization, Graphics.UI.GLUT |
| RefreshRate | Graphics.UI.GLUT.GameMode, Graphics.UI.GLUT |
| Relation | Graphics.UI.GLUT.Initialization, Graphics.UI.GLUT |
| RenderingContext | Graphics.UI.GLUT.Initialization, Graphics.UI.GLUT |
| ReshapeCallback | Graphics.UI.GLUT.Callbacks.Window, Graphics.UI.GLUT.Callbacks, Graphics.UI.GLUT |
| RhombicDodecahedron | Graphics.UI.GLUT.Objects, Graphics.UI.GLUT |
| RightArrow | Graphics.UI.GLUT.Window, Graphics.UI.GLUT |
| RightButton | Graphics.UI.GLUT.Callbacks.Window, Graphics.UI.GLUT.Callbacks, Graphics.UI.GLUT |
| RightSide | Graphics.UI.GLUT.Window, Graphics.UI.GLUT |
| Rings | Graphics.UI.GLUT.Objects, Graphics.UI.GLUT |
| Roman | Graphics.UI.GLUT.Fonts, Graphics.UI.GLUT |
| renderObject | Graphics.UI.GLUT.Objects, Graphics.UI.GLUT |
| renderString | Graphics.UI.GLUT.Fonts, Graphics.UI.GLUT |
| renderingContext | Graphics.UI.GLUT.Initialization, Graphics.UI.GLUT |
| reportErrors | Graphics.UI.GLUT.Debugging, Graphics.UI.GLUT |
| reshapeCallback | Graphics.UI.GLUT.Callbacks.Window, Graphics.UI.GLUT.Callbacks, Graphics.UI.GLUT |
| rgba | Graphics.UI.GLUT.State, Graphics.UI.GLUT |
| rgbaBufferDepths | Graphics.UI.GLUT.State, Graphics.UI.GLUT |
