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  1. Dial Box
  2. Eric Pepke
  3. July 2, 1993
  4.  
  5. Summary: Description of support for SGI dial box
  6.  
  7. There is now preliminary support for the Silicon Graphics dial box.  We
  8. don't have any other programs that use the dial box for comparison, so I
  9. pretty much just guessed at useful functions.  If you have any better ideas,
  10. let me know.
  11.  
  12. The dials now only work when the cursor is in a visualization window and
  13. control aspects of the observer.  Turning a dial changes the value quickly.
  14. If you hold down the Shift key, it works one-tenth as quickly for fine 
  15. adjustments.  All dials have a normal function, and another function which
  16. works when you hold down the Alt key.
  17.  
  18. The dials are arranged in two columns of four each.  The functions are as
  19. in the following diagram:
  20.  
  21. +-----------------------------------+-----------------------------------+
  22. |                                   |                                   |
  23. | Normal: Rotate space left/right   | Normal: Move space left/right     |
  24. |                                   |                                   |
  25. | Alt: Rotate space around world    | Alt: Move space +X, -X            |
  26. |      Y axis                       |                                   |
  27. |                                   |                                   |
  28. +-----------------------------------+-----------------------------------+
  29. |                                   |                                   |
  30. | Normal: Rotate space up/down      | Normal: Move space up/down        |
  31. |                                   |                                   |
  32. | Alt: Rotate space around world    | Alt: Move space +Y, -Y            |
  33. |      X axis                       |                                   |
  34. |                                   |                                   |
  35. +-----------------------------------+-----------------------------------+
  36. |                                   |                                   |
  37. | Normal: Rotate space cw/ccw       | Normal: Move space farther/nearer |
  38. |                                   |                                   |
  39. | Alt: Rotate space around world    | Alt: Move space +Z, -Z            |
  40. |      Z axis                       |                                   |
  41. |                                   |                                   |
  42. +-----------------------------------+-----------------------------------+
  43. |                                   |                                   |
  44. | Normal: Move near clipping plane  | Normal: Zoom wide/narrow          |
  45. |                                   |                                   |
  46. | Alt: Move far clipping plane      | Alt: Change binocular spacing     |
  47. |                                   |                                   |
  48. |                                   |                                   |
  49. +-----------------------------------+-----------------------------------+
  50.  
  51. The move and rotate knobs are set up so that, in the initial default 
  52. observer placement (X to the right, Y to the top, looking down the Z axis)
  53. the normal and alt functions have the same effect.  The alt functions
  54. are in the world coordinates, while the normal functions are in the
  55. observer coordinates.
  56.  
  57.  
  58.