| RGB | Graphics.UI.GLUT, Graphics.UI.GLUT.Initialization |
| RGB' | Graphics.UI.GLUT, Graphics.UI.GLUT.Initialization |
| RGBA | Graphics.UI.GLUT, Graphics.UI.GLUT.Initialization |
| RGBA' | Graphics.UI.GLUT, Graphics.UI.GLUT.Initialization |
| Radius | Graphics.UI.GLUT, Graphics.UI.GLUT.Objects |
| Red | Graphics.UI.GLUT, Graphics.UI.GLUT.Initialization |
| RefreshRate |
| 1 (Type/Class) | Graphics.UI.GLUT, Graphics.UI.GLUT.GameMode |
| 2 (Data Constructor) | Graphics.UI.GLUT, Graphics.UI.GLUT.GameMode |
| Relation | Graphics.UI.GLUT, Graphics.UI.GLUT.Initialization |
| ReshapeCallback | Graphics.UI.GLUT, Graphics.UI.GLUT.Callbacks, Graphics.UI.GLUT.Callbacks.Window |
| RightArrow | Graphics.UI.GLUT, Graphics.UI.GLUT.Window |
| RightButton | Graphics.UI.GLUT, Graphics.UI.GLUT.Callbacks, Graphics.UI.GLUT.Callbacks.Window |
| RightSide | Graphics.UI.GLUT, Graphics.UI.GLUT.Window |
| Rings | Graphics.UI.GLUT, Graphics.UI.GLUT.Objects |
| Roman | Graphics.UI.GLUT, Graphics.UI.GLUT.Fonts |
| relationToString | Graphics.UI.GLUT.Initialization |
| removeOverlay | Graphics.UI.GLUT, Graphics.UI.GLUT.Overlay |
| renderObject | Graphics.UI.GLUT, Graphics.UI.GLUT.Objects |
| renderString | Graphics.UI.GLUT, Graphics.UI.GLUT.Fonts |
| reportErrors | Graphics.UI.GLUT, Graphics.UI.GLUT.Debugging |
| reshapeWindow | Graphics.UI.GLUT, Graphics.UI.GLUT.Window |
